<?xml version="1.0" encoding="UTF-8"?>

<!--XBRL Document Created with the Workiva Platform-->
<!--Copyright 2026 Workiva-->
<!--r:019fd25f-c187-74ac-bf01-c2e34efdf5b3,g:5867db9c-461f-4f47-985e-86f18c5269ca-->
<link:linkbase xmlns:link="http://www.xbrl.org/2003/linkbase" xmlns:xlink="http://www.w3.org/1999/xlink" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:schemaLocation="http://www.xbrl.org/2003/linkbase http://www.xbrl.org/2003/xbrl-linkbase-2003-12-31.xsd">
  <link:arcroleRef arcroleURI="https://xbrl.org/2023/arcrole/summation-item" xlink:type="simple" xlink:href="https://www.xbrl.org/2023/calculation-1.1.xsd#summation-item"/>
  <link:roleRef roleURI="http://www.seacoastbanking.com/role/CONSOLIDATEDSTATEMENTSOFINCOMEUnaudited" xlink:type="simple" xlink:href="sbcf-20260930.xsd#CONSOLIDATEDSTATEMENTSOFINCOMEUnaudited"/>
  <link:calculationLink xlink:role="http://www.seacoastbanking.com/role/CONSOLIDATEDSTATEMENTSOFINCOMEUnaudited" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_NoninterestExpense_019fd25f-c567-756b-b6ba-85df48d712f5" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_NoninterestExpense"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_OccupancyNet_019fd25f-c567-7a8b-b962-e630041a8eda" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_OccupancyNet"/>
    <link:calculationArc order="1" weight="1.0" xlink:arcrole="https://xbrl.org/2023/arcrole/summation-item" xlink:from="loc_us-gaap_NoninterestExpense_019fd25f-c567-756b-b6ba-85df48d712f5" xlink:to="loc_us-gaap_OccupancyNet_019fd25f-c567-7a8b-b962-e630041a8eda" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ProfessionalFees_019fd25f-c567-7380-a979-694bfdda8916" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_ProfessionalFees"/>
    <link:calculationArc order="2" weight="1.0" xlink:arcrole="https://xbrl.org/2023/arcrole/summation-item" xlink:from="loc_us-gaap_NoninterestExpense_019fd25f-c567-756b-b6ba-85df48d712f5" xlink:to="loc_us-gaap_ProfessionalFees_019fd25f-c567-7380-a979-694bfdda8916" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_sbcf_FurnitureAndEquipmentExpense_019fd25f-c567-7ec5-a794-70230f3b0058" xlink:href="sbcf-20260930.xsd#sbcf_FurnitureAndEquipmentExpense"/>
    <link:calculationArc order="3" weight="1.0" xlink:arcrole="https://xbrl.org/2023/arcrole/summation-item" xlink:from="loc_us-gaap_NoninterestExpense_019fd25f-c567-756b-b6ba-85df48d712f5" xlink:to="loc_sbcf_FurnitureAndEquipmentExpense_019fd25f-c567-7ec5-a794-70230f3b0058" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LaborAndRelatedExpense_019fd25f-c567-7acd-8466-4d505718d7e0" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_LaborAndRelatedExpense"/>
    <link:calculationArc order="4" weight="1.0" xlink:arcrole="https://xbrl.org/2023/arcrole/summation-item" xlink:from="loc_us-gaap_NoninterestExpense_019fd25f-c567-756b-b6ba-85df48d712f5" xlink:to="loc_us-gaap_LaborAndRelatedExpense_019fd25f-c567-7acd-8466-4d505718d7e0" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_sbcf_FederalDepositInsuranceCorporationAssessment_019fd25f-c567-7149-90e6-67f7bf5ec241" xlink:href="sbcf-20260930.xsd#sbcf_FederalDepositInsuranceCorporationAssessment"/>
    <link:calculationArc order="5" weight="1.0" xlink:arcrole="https://xbrl.org/2023/arcrole/summation-item" xlink:from="loc_us-gaap_NoninterestExpense_019fd25f-c567-756b-b6ba-85df48d712f5" xlink:to="loc_sbcf_FederalDepositInsuranceCorporationAssessment_019fd25f-c567-7149-90e6-67f7bf5ec241" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AmortizationOfIntangibleAssets_019fd25f-c567-7a85-844e-1de619e4aa7f" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_AmortizationOfIntangibleAssets"/>
    <link:calculationArc order="6" weight="1.0" xlink:arcrole="https://xbrl.org/2023/arcrole/summation-item" xlink:from="loc_us-gaap_NoninterestExpense_019fd25f-c567-756b-b6ba-85df48d712f5" xlink:to="loc_us-gaap_AmortizationOfIntangibleAssets_019fd25f-c567-7a85-844e-1de619e4aa7f" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_OtherNoninterestExpense_019fd25f-c567-786b-bec3-6016a5ea4a3f" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_OtherNoninterestExpense"/>
    <link:calculationArc order="7" weight="1.0" xlink:arcrole="https://xbrl.org/2023/arcrole/summation-item" xlink:from="loc_us-gaap_NoninterestExpense_019fd25f-c567-756b-b6ba-85df48d712f5" xlink:to="loc_us-gaap_OtherNoninterestExpense_019fd25f-c567-786b-bec3-6016a5ea4a3f" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_InformationTechnologyAndDataProcessing_019fd25f-c567-7eb2-b020-de5f722d3439" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_InformationTechnologyAndDataProcessing"/>
    <link:calculationArc order="8" weight="1.0" xlink:arcrole="https://xbrl.org/2023/arcrole/summation-item" xlink:from="loc_us-gaap_NoninterestExpense_019fd25f-c567-756b-b6ba-85df48d712f5" xlink:to="loc_us-gaap_InformationTechnologyAndDataProcessing_019fd25f-c567-7eb2-b020-de5f722d3439" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_GainsLossesOnSalesOfInvestmentRealEstate_019fd25f-c567-724b-a5f9-d5118e803815" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_GainsLossesOnSalesOfInvestmentRealEstate"/>
    <link:calculationArc order="9" weight="-1.0" xlink:arcrole="https://xbrl.org/2023/arcrole/summation-item" xlink:from="loc_us-gaap_NoninterestExpense_019fd25f-c567-756b-b6ba-85df48d712f5" xlink:to="loc_us-gaap_GainsLossesOnSalesOfInvestmentRealEstate_019fd25f-c567-724b-a5f9-d5118e803815" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_OffBalanceSheetCreditLossLiabilityCreditLossExpenseReversal_019fd25f-c567-7544-b901-a0581555fd35" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_OffBalanceSheetCreditLossLiabilityCreditLossExpenseReversal"/>
    <link:calculationArc order="10" weight="1.0" xlink:arcrole="https://xbrl.org/2023/arcrole/summation-item" xlink:from="loc_us-gaap_NoninterestExpense_019fd25f-c567-756b-b6ba-85df48d712f5" xlink:to="loc_us-gaap_OffBalanceSheetCreditLossLiabilityCreditLossExpenseReversal_019fd25f-c567-7544-b901-a0581555fd35" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_BusinessCombinationAcquisitionRelatedCosts_019fd25f-c567-740f-9c5b-69e8f82fe248" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_BusinessCombinationAcquisitionRelatedCosts"/>
    <link:calculationArc order="11" weight="1.0" xlink:arcrole="https://xbrl.org/2023/arcrole/summation-item" xlink:from="loc_us-gaap_NoninterestExpense_019fd25f-c567-756b-b6ba-85df48d712f5" xlink:to="loc_us-gaap_BusinessCombinationAcquisitionRelatedCosts_019fd25f-c567-740f-9c5b-69e8f82fe248" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_MarketingExpense_019fd25f-c567-7859-8070-e58b62775e60" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_MarketingExpense"/>
    <link:calculationArc order="12" weight="1.0" xlink:arcrole="https://xbrl.org/2023/arcrole/summation-item" xlink:from="loc_us-gaap_NoninterestExpense_019fd25f-c567-756b-b6ba-85df48d712f5" xlink:to="loc_us-gaap_MarketingExpense_019fd25f-c567-7859-8070-e58b62775e60" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_InterestIncomeExpenseAfterProvisionForLoanLoss_019fd25f-c567-729b-bcc7-03fa76885454" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_InterestIncomeExpenseAfterProvisionForLoanLoss"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_InterestIncomeExpenseNet_019fd25f-c567-75b5-bb73-5cf58ea4fac4" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_InterestIncomeExpenseNet"/>
    <link:calculationArc order="1" weight="1.0" xlink:arcrole="https://xbrl.org/2023/arcrole/summation-item" xlink:from="loc_us-gaap_InterestIncomeExpenseAfterProvisionForLoanLoss_019fd25f-c567-729b-bcc7-03fa76885454" xlink:to="loc_us-gaap_InterestIncomeExpenseNet_019fd25f-c567-75b5-bb73-5cf58ea4fac4" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_sbcf_FinancingReceivableAndAccruedInterestReceivableCreditLossProvisionReversal_019fd25f-c567-765f-bdd0-9d6f71af00aa" xlink:href="sbcf-20260930.xsd#sbcf_FinancingReceivableAndAccruedInterestReceivableCreditLossProvisionReversal"/>
    <link:calculationArc order="2" weight="-1.0" xlink:arcrole="https://xbrl.org/2023/arcrole/summation-item" xlink:from="loc_us-gaap_InterestIncomeExpenseAfterProvisionForLoanLoss_019fd25f-c567-729b-bcc7-03fa76885454" xlink:to="loc_sbcf_FinancingReceivableAndAccruedInterestReceivableCreditLossProvisionReversal_019fd25f-c567-765f-bdd0-9d6f71af00aa" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_NoninterestIncome_019fd25f-c567-7e5c-909c-e33ba7324f82" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_NoninterestIncome"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_GainLossOnInvestments_019fd25f-c567-7832-adf8-bb03228c6cd9" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_GainLossOnInvestments"/>
    <link:calculationArc order="1" weight="1.0" xlink:arcrole="https://xbrl.org/2023/arcrole/summation-item" xlink:from="loc_us-gaap_NoninterestIncome_019fd25f-c567-7e5c-909c-e33ba7324f82" xlink:to="loc_us-gaap_GainLossOnInvestments_019fd25f-c567-7832-adf8-bb03228c6cd9" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_sbcf_NonInterestIncomeExcludingGainLossOnLoansSaleAndInvestments_019fd25f-c567-7375-b770-b206aca952e5" xlink:href="sbcf-20260930.xsd#sbcf_NonInterestIncomeExcludingGainLossOnLoansSaleAndInvestments"/>
    <link:calculationArc order="2" weight="1.0" xlink:arcrole="https://xbrl.org/2023/arcrole/summation-item" xlink:from="loc_us-gaap_NoninterestIncome_019fd25f-c567-7e5c-909c-e33ba7324f82" xlink:to="loc_sbcf_NonInterestIncomeExcludingGainLossOnLoansSaleAndInvestments_019fd25f-c567-7375-b770-b206aca952e5" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_InterestIncomeExpenseNet_019fd25f-c567-70a0-961e-b8c5df3c6aab" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_InterestIncomeExpenseNet"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_InterestAndDividendIncomeOperating_019fd25f-c567-7aed-a90e-ab8b90ea7545" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_InterestAndDividendIncomeOperating"/>
    <link:calculationArc order="1" weight="1.0" xlink:arcrole="https://xbrl.org/2023/arcrole/summation-item" xlink:from="loc_us-gaap_InterestIncomeExpenseNet_019fd25f-c567-70a0-961e-b8c5df3c6aab" xlink:to="loc_us-gaap_InterestAndDividendIncomeOperating_019fd25f-c567-7aed-a90e-ab8b90ea7545" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_InterestExpenseOperating_019fd25f-c567-7fe8-94dd-96bf3cc16dd3" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_InterestExpenseOperating"/>
    <link:calculationArc order="2" weight="-1.0" xlink:arcrole="https://xbrl.org/2023/arcrole/summation-item" xlink:from="loc_us-gaap_InterestIncomeExpenseNet_019fd25f-c567-70a0-961e-b8c5df3c6aab" xlink:to="loc_us-gaap_InterestExpenseOperating_019fd25f-c567-7fe8-94dd-96bf3cc16dd3" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_NetIncomeLoss_019fd25f-c567-732c-8350-4959f9c09853" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_NetIncomeLoss"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest_019fd25f-c567-722e-bcfc-4fdd4b653b38" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest"/>
    <link:calculationArc order="1" weight="1.0" xlink:arcrole="https://xbrl.org/2023/arcrole/summation-item" xlink:from="loc_us-gaap_NetIncomeLoss_019fd25f-c567-732c-8350-4959f9c09853" xlink:to="loc_us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest_019fd25f-c567-722e-bcfc-4fdd4b653b38" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_IncomeTaxExpenseBenefit_019fd25f-c567-70b9-9c66-32f0bf76ff8e" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_IncomeTaxExpenseBenefit"/>
    <link:calculationArc order="2" weight="-1.0" xlink:arcrole="https://xbrl.org/2023/arcrole/summation-item" xlink:from="loc_us-gaap_NetIncomeLoss_019fd25f-c567-732c-8350-4959f9c09853" xlink:to="loc_us-gaap_IncomeTaxExpenseBenefit_019fd25f-c567-70b9-9c66-32f0bf76ff8e" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_InterestExpenseOperating_019fd25f-c567-7d44-b558-dede59ba55c9" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_InterestExpenseOperating"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_InterestExpenseSavingsDeposits_019fd25f-c567-707b-9f26-93e923a48d3b" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_InterestExpenseSavingsDeposits"/>
    <link:calculationArc order="1" weight="1.0" xlink:arcrole="https://xbrl.org/2023/arcrole/summation-item" xlink:from="loc_us-gaap_InterestExpenseOperating_019fd25f-c567-7d44-b558-dede59ba55c9" xlink:to="loc_us-gaap_InterestExpenseSavingsDeposits_019fd25f-c567-707b-9f26-93e923a48d3b" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_InterestExpenseTimeDeposits_019fd25f-c567-783a-8232-ec4dce27881e" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_InterestExpenseTimeDeposits"/>
    <link:calculationArc order="2" weight="1.0" xlink:arcrole="https://xbrl.org/2023/arcrole/summation-item" xlink:from="loc_us-gaap_InterestExpenseOperating_019fd25f-c567-7d44-b558-dede59ba55c9" xlink:to="loc_us-gaap_InterestExpenseTimeDeposits_019fd25f-c567-783a-8232-ec4dce27881e" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_InterestExpenseBorrowings_019fd25f-c567-7ec3-a480-9f96f6eabe2d" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_InterestExpenseBorrowings"/>
    <link:calculationArc order="3" weight="1.0" xlink:arcrole="https://xbrl.org/2023/arcrole/summation-item" xlink:from="loc_us-gaap_InterestExpenseOperating_019fd25f-c567-7d44-b558-dede59ba55c9" xlink:to="loc_us-gaap_InterestExpenseBorrowings_019fd25f-c567-7ec3-a480-9f96f6eabe2d" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest_019fd25f-c567-70c4-a3d8-756b9a9dd6f2" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_NoninterestIncome_019fd25f-c567-7ff3-a8d6-caabd51ac6b2" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_NoninterestIncome"/>
    <link:calculationArc order="1" weight="1.0" xlink:arcrole="https://xbrl.org/2023/arcrole/summation-item" xlink:from="loc_us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest_019fd25f-c567-70c4-a3d8-756b9a9dd6f2" xlink:to="loc_us-gaap_NoninterestIncome_019fd25f-c567-7ff3-a8d6-caabd51ac6b2" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_InterestIncomeExpenseAfterProvisionForLoanLoss_019fd25f-c567-7631-8ea1-9378f2c567dc" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_InterestIncomeExpenseAfterProvisionForLoanLoss"/>
    <link:calculationArc order="2" weight="1.0" xlink:arcrole="https://xbrl.org/2023/arcrole/summation-item" xlink:from="loc_us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest_019fd25f-c567-70c4-a3d8-756b9a9dd6f2" xlink:to="loc_us-gaap_InterestIncomeExpenseAfterProvisionForLoanLoss_019fd25f-c567-7631-8ea1-9378f2c567dc" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_NoninterestExpense_019fd25f-c567-79e9-b6f3-9e9b81fa9f66" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_NoninterestExpense"/>
    <link:calculationArc order="3" weight="-1.0" xlink:arcrole="https://xbrl.org/2023/arcrole/summation-item" xlink:from="loc_us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest_019fd25f-c567-70c4-a3d8-756b9a9dd6f2" xlink:to="loc_us-gaap_NoninterestExpense_019fd25f-c567-79e9-b6f3-9e9b81fa9f66" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_sbcf_NetIncomeLossAvailableToCommonStockholdersBeforeEarningsLossAllocatedToParticipatingSecurities_019fd25f-c567-7587-8f4c-3080c64767c6" xlink:href="sbcf-20260930.xsd#sbcf_NetIncomeLossAvailableToCommonStockholdersBeforeEarningsLossAllocatedToParticipatingSecurities"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_NetIncomeLoss_019fd25f-c567-7236-ac19-e34800a11d69" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_NetIncomeLoss"/>
    <link:calculationArc order="1" weight="1.0" xlink:arcrole="https://xbrl.org/2023/arcrole/summation-item" xlink:from="loc_sbcf_NetIncomeLossAvailableToCommonStockholdersBeforeEarningsLossAllocatedToParticipatingSecurities_019fd25f-c567-7587-8f4c-3080c64767c6" xlink:to="loc_us-gaap_NetIncomeLoss_019fd25f-c567-7236-ac19-e34800a11d69" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PreferredStockDividendsIncomeStatementImpact_019fd25f-c567-7fc5-914c-5220ca367b50" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_PreferredStockDividendsIncomeStatementImpact"/>
    <link:calculationArc order="2" weight="-1.0" xlink:arcrole="https://xbrl.org/2023/arcrole/summation-item" xlink:from="loc_sbcf_NetIncomeLossAvailableToCommonStockholdersBeforeEarningsLossAllocatedToParticipatingSecurities_019fd25f-c567-7587-8f4c-3080c64767c6" xlink:to="loc_us-gaap_PreferredStockDividendsIncomeStatementImpact_019fd25f-c567-7fc5-914c-5220ca367b50" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_InterestAndDividendIncomeOperating_019fd25f-c567-7a86-94e0-deb8e0537a69" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_InterestAndDividendIncomeOperating"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_InterestAndFeeIncomeLoansAndLeases_019fd25f-c567-77f7-a817-9117e365b35b" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_InterestAndFeeIncomeLoansAndLeases"/>
    <link:calculationArc order="1" weight="1.0" xlink:arcrole="https://xbrl.org/2023/arcrole/summation-item" xlink:from="loc_us-gaap_InterestAndDividendIncomeOperating_019fd25f-c567-7a86-94e0-deb8e0537a69" xlink:to="loc_us-gaap_InterestAndFeeIncomeLoansAndLeases_019fd25f-c567-77f7-a817-9117e365b35b" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_InterestAndDividendIncomeSecurities_019fd25f-c567-7026-8c22-f7707245b656" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_InterestAndDividendIncomeSecurities"/>
    <link:calculationArc order="2" weight="1.0" xlink:arcrole="https://xbrl.org/2023/arcrole/summation-item" xlink:from="loc_us-gaap_InterestAndDividendIncomeOperating_019fd25f-c567-7a86-94e0-deb8e0537a69" xlink:to="loc_us-gaap_InterestAndDividendIncomeSecurities_019fd25f-c567-7026-8c22-f7707245b656" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_sbcf_InterestOnFederalFundsSoldAndInterestBearingDeposits_019fd25f-c567-78d9-9c9e-b54db1963814" xlink:href="sbcf-20260930.xsd#sbcf_InterestOnFederalFundsSoldAndInterestBearingDeposits"/>
    <link:calculationArc order="3" weight="1.0" xlink:arcrole="https://xbrl.org/2023/arcrole/summation-item" xlink:from="loc_us-gaap_InterestAndDividendIncomeOperating_019fd25f-c567-7a86-94e0-deb8e0537a69" xlink:to="loc_sbcf_InterestOnFederalFundsSoldAndInterestBearingDeposits_019fd25f-c567-78d9-9c9e-b54db1963814" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_sbcf_NonInterestIncomeExcludingGainLossOnLoansSaleAndInvestments_019fd25f-c567-7a3f-851e-7c91e5ce30f3" xlink:href="sbcf-20260930.xsd#sbcf_NonInterestIncomeExcludingGainLossOnLoansSaleAndInvestments"/>
    <link:loc xlink:type="locator" xlink:label="loc_sbcf_NoninterestIncomeServicingCharges_019fd25f-c567-7a4c-ba17-5480f7ed1429" xlink:href="sbcf-20260930.xsd#sbcf_NoninterestIncomeServicingCharges"/>
    <link:calculationArc order="1" weight="1.0" xlink:arcrole="https://xbrl.org/2023/arcrole/summation-item" xlink:from="loc_sbcf_NonInterestIncomeExcludingGainLossOnLoansSaleAndInvestments_019fd25f-c567-7a3f-851e-7c91e5ce30f3" xlink:to="loc_sbcf_NoninterestIncomeServicingCharges_019fd25f-c567-7a4c-ba17-5480f7ed1429" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FeesAndCommissionsMortgageBankingAndServicing_019fd25f-c567-7f9c-9379-0694168717bd" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_FeesAndCommissionsMortgageBankingAndServicing"/>
    <link:calculationArc order="2" weight="1.0" xlink:arcrole="https://xbrl.org/2023/arcrole/summation-item" xlink:from="loc_sbcf_NonInterestIncomeExcludingGainLossOnLoansSaleAndInvestments_019fd25f-c567-7a3f-851e-7c91e5ce30f3" xlink:to="loc_us-gaap_FeesAndCommissionsMortgageBankingAndServicing_019fd25f-c567-7f9c-9379-0694168717bd" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_InsuranceServicesRevenue_019fd25f-c567-7843-abf7-1475ba1fc3e9" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_InsuranceServicesRevenue"/>
    <link:calculationArc order="3" weight="1.0" xlink:arcrole="https://xbrl.org/2023/arcrole/summation-item" xlink:from="loc_sbcf_NonInterestIncomeExcludingGainLossOnLoansSaleAndInvestments_019fd25f-c567-7a3f-851e-7c91e5ce30f3" xlink:to="loc_us-gaap_InsuranceServicesRevenue_019fd25f-c567-7843-abf7-1475ba1fc3e9" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_BankOwnedLifeInsuranceIncome_019fd25f-c567-79aa-bcb5-844b662d2503" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_BankOwnedLifeInsuranceIncome"/>
    <link:calculationArc order="4" weight="1.0" xlink:arcrole="https://xbrl.org/2023/arcrole/summation-item" xlink:from="loc_sbcf_NonInterestIncomeExcludingGainLossOnLoansSaleAndInvestments_019fd25f-c567-7a3f-851e-7c91e5ce30f3" xlink:to="loc_us-gaap_BankOwnedLifeInsuranceIncome_019fd25f-c567-79aa-bcb5-844b662d2503" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_sbcf_InterchangeIncome_019fd25f-c567-785d-98b7-fa42b7f39e6d" xlink:href="sbcf-20260930.xsd#sbcf_InterchangeIncome"/>
    <link:calculationArc order="5" weight="1.0" xlink:arcrole="https://xbrl.org/2023/arcrole/summation-item" xlink:from="loc_sbcf_NonInterestIncomeExcludingGainLossOnLoansSaleAndInvestments_019fd25f-c567-7a3f-851e-7c91e5ce30f3" xlink:to="loc_sbcf_InterchangeIncome_019fd25f-c567-785d-98b7-fa42b7f39e6d" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_InvestmentBankingAdvisoryBrokerageAndUnderwritingFeesAndCommissions_019fd25f-c567-7b1e-ba59-c806f98a0e9b" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_InvestmentBankingAdvisoryBrokerageAndUnderwritingFeesAndCommissions"/>
    <link:calculationArc order="6" weight="1.0" xlink:arcrole="https://xbrl.org/2023/arcrole/summation-item" xlink:from="loc_sbcf_NonInterestIncomeExcludingGainLossOnLoansSaleAndInvestments_019fd25f-c567-7a3f-851e-7c91e5ce30f3" xlink:to="loc_us-gaap_InvestmentBankingAdvisoryBrokerageAndUnderwritingFeesAndCommissions_019fd25f-c567-7b1e-ba59-c806f98a0e9b" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_NoninterestIncomeOtherOperatingIncome_019fd25f-c567-7876-b527-b4d07c8572e6" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_NoninterestIncomeOtherOperatingIncome"/>
    <link:calculationArc order="7" weight="1.0" xlink:arcrole="https://xbrl.org/2023/arcrole/summation-item" xlink:from="loc_sbcf_NonInterestIncomeExcludingGainLossOnLoansSaleAndInvestments_019fd25f-c567-7a3f-851e-7c91e5ce30f3" xlink:to="loc_us-gaap_NoninterestIncomeOtherOperatingIncome_019fd25f-c567-7876-b527-b4d07c8572e6" xlink:type="arc"/>
  </link:calculationLink>
  <link:roleRef roleURI="http://www.seacoastbanking.com/role/CONSOLIDATEDSTATEMENTSOFCOMPREHENSIVEINCOMELOSSUnaudited" xlink:type="simple" xlink:href="sbcf-20260930.xsd#CONSOLIDATEDSTATEMENTSOFCOMPREHENSIVEINCOMELOSSUnaudited"/>
  <link:calculationLink xlink:role="http://www.seacoastbanking.com/role/CONSOLIDATEDSTATEMENTSOFCOMPREHENSIVEINCOMELOSSUnaudited" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ComprehensiveIncomeNetOfTax_019fd25f-c567-7e17-b3de-822f48cd09d0" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_ComprehensiveIncomeNetOfTax"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_NetIncomeLoss_019fd25f-c567-7314-8abc-3e774a628ea8" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_NetIncomeLoss"/>
    <link:calculationArc order="1" weight="1.0" xlink:arcrole="https://xbrl.org/2023/arcrole/summation-item" xlink:from="loc_us-gaap_ComprehensiveIncomeNetOfTax_019fd25f-c567-7e17-b3de-822f48cd09d0" xlink:to="loc_us-gaap_NetIncomeLoss_019fd25f-c567-7314-8abc-3e774a628ea8" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_OtherComprehensiveIncomeLossNetOfTaxPortionAttributableToParent_019fd25f-c567-71bb-b6a4-b62ea7b1aaf1" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_OtherComprehensiveIncomeLossNetOfTaxPortionAttributableToParent"/>
    <link:calculationArc order="2" weight="1.0" xlink:arcrole="https://xbrl.org/2023/arcrole/summation-item" xlink:from="loc_us-gaap_ComprehensiveIncomeNetOfTax_019fd25f-c567-7e17-b3de-822f48cd09d0" xlink:to="loc_us-gaap_OtherComprehensiveIncomeLossNetOfTaxPortionAttributableToParent_019fd25f-c567-71bb-b6a4-b62ea7b1aaf1" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_OtherComprehensiveIncomeLossNetOfTaxPortionAttributableToParent_019fd25f-c567-7476-a14f-3d7538958be8" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_OtherComprehensiveIncomeLossNetOfTaxPortionAttributableToParent"/>
    <link:loc xlink:type="locator" xlink:label="loc_sbcf_OtherComprehensiveIncomeLossFairValueHedgeGainLossAfterReclassificationAndTaxParent_019fd25f-c567-79c5-83aa-9af3d55d5f28" xlink:href="sbcf-20260930.xsd#sbcf_OtherComprehensiveIncomeLossFairValueHedgeGainLossAfterReclassificationAndTaxParent"/>
    <link:calculationArc order="1" weight="1.0" xlink:arcrole="https://xbrl.org/2023/arcrole/summation-item" xlink:from="loc_us-gaap_OtherComprehensiveIncomeLossNetOfTaxPortionAttributableToParent_019fd25f-c567-7476-a14f-3d7538958be8" xlink:to="loc_sbcf_OtherComprehensiveIncomeLossFairValueHedgeGainLossAfterReclassificationAndTaxParent_019fd25f-c567-79c5-83aa-9af3d55d5f28" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_OtherComprehensiveIncomeUnrealizedHoldingGainLossOnSecuritiesArisingDuringPeriodNetOfTax_019fd25f-c567-7f84-8129-10e682379e2b" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_OtherComprehensiveIncomeUnrealizedHoldingGainLossOnSecuritiesArisingDuringPeriodNetOfTax"/>
    <link:calculationArc order="2" weight="1.0" xlink:arcrole="https://xbrl.org/2023/arcrole/summation-item" xlink:from="loc_us-gaap_OtherComprehensiveIncomeLossNetOfTaxPortionAttributableToParent_019fd25f-c567-7476-a14f-3d7538958be8" xlink:to="loc_us-gaap_OtherComprehensiveIncomeUnrealizedHoldingGainLossOnSecuritiesArisingDuringPeriodNetOfTax_019fd25f-c567-7f84-8129-10e682379e2b" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIForSaleOfSecuritiesNetOfTax_019fd25f-c567-7855-a044-b3bd3b036814" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIForSaleOfSecuritiesNetOfTax"/>
    <link:calculationArc order="3" weight="-1.0" xlink:arcrole="https://xbrl.org/2023/arcrole/summation-item" xlink:from="loc_us-gaap_OtherComprehensiveIncomeLossNetOfTaxPortionAttributableToParent_019fd25f-c567-7476-a14f-3d7538958be8" xlink:to="loc_us-gaap_OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIForSaleOfSecuritiesNetOfTax_019fd25f-c567-7855-a044-b3bd3b036814" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_OciDebtSecuritiesAvailableForSaleTransferToHeldToMaturityAdjustmentFromAociForAmortizationOfGainLossAfterTax_019fd25f-c567-7ad6-831b-d9bd56d5a71c" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_OciDebtSecuritiesAvailableForSaleTransferToHeldToMaturityAdjustmentFromAociForAmortizationOfGainLossAfterTax"/>
    <link:calculationArc order="4" weight="-1.0" xlink:arcrole="https://xbrl.org/2023/arcrole/summation-item" xlink:from="loc_us-gaap_OtherComprehensiveIncomeLossNetOfTaxPortionAttributableToParent_019fd25f-c567-7476-a14f-3d7538958be8" xlink:to="loc_us-gaap_OciDebtSecuritiesAvailableForSaleTransferToHeldToMaturityAdjustmentFromAociForAmortizationOfGainLossAfterTax_019fd25f-c567-7ad6-831b-d9bd56d5a71c" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_OtherComprehensiveIncomeLossCashFlowHedgeGainLossAfterReclassificationAndTaxParent_019fd25f-c567-7012-b641-bec83cb7e129" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_OtherComprehensiveIncomeLossCashFlowHedgeGainLossAfterReclassificationAndTaxParent"/>
    <link:calculationArc order="5" weight="1.0" xlink:arcrole="https://xbrl.org/2023/arcrole/summation-item" xlink:from="loc_us-gaap_OtherComprehensiveIncomeLossNetOfTaxPortionAttributableToParent_019fd25f-c567-7476-a14f-3d7538958be8" xlink:to="loc_us-gaap_OtherComprehensiveIncomeLossCashFlowHedgeGainLossAfterReclassificationAndTaxParent_019fd25f-c567-7012-b641-bec83cb7e129" xlink:type="arc"/>
  </link:calculationLink>
  <link:roleRef roleURI="http://www.seacoastbanking.com/role/CONSOLIDATEDBALANCESHEETSUnaudited" xlink:type="simple" xlink:href="sbcf-20260930.xsd#CONSOLIDATEDBALANCESHEETSUnaudited"/>
  <link:calculationLink xlink:role="http://www.seacoastbanking.com/role/CONSOLIDATEDBALANCESHEETSUnaudited" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_Investments_019fd25f-c567-7bfd-a792-dc3cb93277fb" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_Investments"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtSecuritiesAvailableForSaleExcludingAccruedInterest_019fd25f-c567-7b6d-9da6-f919ea05166c" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_DebtSecuritiesAvailableForSaleExcludingAccruedInterest"/>
    <link:calculationArc order="1" weight="1.0" xlink:arcrole="https://xbrl.org/2023/arcrole/summation-item" xlink:from="loc_us-gaap_Investments_019fd25f-c567-7bfd-a792-dc3cb93277fb" xlink:to="loc_us-gaap_DebtSecuritiesAvailableForSaleExcludingAccruedInterest_019fd25f-c567-7b6d-9da6-f919ea05166c" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtSecuritiesHeldToMaturityExcludingAccruedInterestAfterAllowanceForCreditLoss_019fd25f-c567-7857-999d-a6aae3eb0dba" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_DebtSecuritiesHeldToMaturityExcludingAccruedInterestAfterAllowanceForCreditLoss"/>
    <link:calculationArc order="2" weight="1.0" xlink:arcrole="https://xbrl.org/2023/arcrole/summation-item" xlink:from="loc_us-gaap_Investments_019fd25f-c567-7bfd-a792-dc3cb93277fb" xlink:to="loc_us-gaap_DebtSecuritiesHeldToMaturityExcludingAccruedInterestAfterAllowanceForCreditLoss_019fd25f-c567-7857-999d-a6aae3eb0dba" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CashAndCashEquivalentsAtCarryingValue_019fd25f-c567-7387-b082-9414315f214d" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_CashAndCashEquivalentsAtCarryingValue"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CashAndDueFromBanks_019fd25f-c567-7a82-a3f8-d57e358eeb2d" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_CashAndDueFromBanks"/>
    <link:calculationArc order="1" weight="1.0" xlink:arcrole="https://xbrl.org/2023/arcrole/summation-item" xlink:from="loc_us-gaap_CashAndCashEquivalentsAtCarryingValue_019fd25f-c567-7387-b082-9414315f214d" xlink:to="loc_us-gaap_CashAndDueFromBanks_019fd25f-c567-7a82-a3f8-d57e358eeb2d" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_InterestBearingDepositsInBanks_019fd25f-c567-7a5d-bb86-e7c99fad2afe" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_InterestBearingDepositsInBanks"/>
    <link:calculationArc order="2" weight="1.0" xlink:arcrole="https://xbrl.org/2023/arcrole/summation-item" xlink:from="loc_us-gaap_CashAndCashEquivalentsAtCarryingValue_019fd25f-c567-7387-b082-9414315f214d" xlink:to="loc_us-gaap_InterestBearingDepositsInBanks_019fd25f-c567-7a5d-bb86-e7c99fad2afe" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FinancingReceivableExcludingAccruedInterestAfterAllowanceForCreditLoss_019fd25f-c567-7864-976e-7b8c961a927b" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_FinancingReceivableExcludingAccruedInterestAfterAllowanceForCreditLoss"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FinancingReceivableExcludingAccruedInterestBeforeAllowanceForCreditLoss_019fd25f-c567-7e1a-a874-c0edf56ba2fa" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_FinancingReceivableExcludingAccruedInterestBeforeAllowanceForCreditLoss"/>
    <link:calculationArc order="1" weight="1.0" xlink:arcrole="https://xbrl.org/2023/arcrole/summation-item" xlink:from="loc_us-gaap_FinancingReceivableExcludingAccruedInterestAfterAllowanceForCreditLoss_019fd25f-c567-7864-976e-7b8c961a927b" xlink:to="loc_us-gaap_FinancingReceivableExcludingAccruedInterestBeforeAllowanceForCreditLoss_019fd25f-c567-7e1a-a874-c0edf56ba2fa" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FinancingReceivableAllowanceForCreditLossExcludingAccruedInterest_019fd25f-c567-73c9-b9da-697bb98e5c05" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_FinancingReceivableAllowanceForCreditLossExcludingAccruedInterest"/>
    <link:calculationArc order="2" weight="-1.0" xlink:arcrole="https://xbrl.org/2023/arcrole/summation-item" xlink:from="loc_us-gaap_FinancingReceivableExcludingAccruedInterestAfterAllowanceForCreditLoss_019fd25f-c567-7864-976e-7b8c961a927b" xlink:to="loc_us-gaap_FinancingReceivableAllowanceForCreditLossExcludingAccruedInterest_019fd25f-c567-73c9-b9da-697bb98e5c05" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_sbcf_StockholdersEquityBeforeAccumulatedOtherComprehensiveIncome_019fd25f-c567-7617-a148-754870a5a2bb" xlink:href="sbcf-20260930.xsd#sbcf_StockholdersEquityBeforeAccumulatedOtherComprehensiveIncome"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_TreasuryStockValue_019fd25f-c567-7210-9fd1-6d1d80ba1be5" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_TreasuryStockValue"/>
    <link:calculationArc order="1" weight="-1.0" xlink:arcrole="https://xbrl.org/2023/arcrole/summation-item" xlink:from="loc_sbcf_StockholdersEquityBeforeAccumulatedOtherComprehensiveIncome_019fd25f-c567-7617-a148-754870a5a2bb" xlink:to="loc_us-gaap_TreasuryStockValue_019fd25f-c567-7210-9fd1-6d1d80ba1be5" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AdditionalPaidInCapital_019fd25f-c567-7474-b41c-44e2bb2d30e9" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_AdditionalPaidInCapital"/>
    <link:calculationArc order="2" weight="1.0" xlink:arcrole="https://xbrl.org/2023/arcrole/summation-item" xlink:from="loc_sbcf_StockholdersEquityBeforeAccumulatedOtherComprehensiveIncome_019fd25f-c567-7617-a148-754870a5a2bb" xlink:to="loc_us-gaap_AdditionalPaidInCapital_019fd25f-c567-7474-b41c-44e2bb2d30e9" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CommonStockValue_019fd25f-c567-74eb-835f-3e94efbb4415" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_CommonStockValue"/>
    <link:calculationArc order="3" weight="1.0" xlink:arcrole="https://xbrl.org/2023/arcrole/summation-item" xlink:from="loc_sbcf_StockholdersEquityBeforeAccumulatedOtherComprehensiveIncome_019fd25f-c567-7617-a148-754870a5a2bb" xlink:to="loc_us-gaap_CommonStockValue_019fd25f-c567-74eb-835f-3e94efbb4415" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RetainedEarningsAccumulatedDeficit_019fd25f-c567-7e54-b590-ec97e3d3137f" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_RetainedEarningsAccumulatedDeficit"/>
    <link:calculationArc order="4" weight="1.0" xlink:arcrole="https://xbrl.org/2023/arcrole/summation-item" xlink:from="loc_sbcf_StockholdersEquityBeforeAccumulatedOtherComprehensiveIncome_019fd25f-c567-7617-a148-754870a5a2bb" xlink:to="loc_us-gaap_RetainedEarningsAccumulatedDeficit_019fd25f-c567-7e54-b590-ec97e3d3137f" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_StockholdersEquity_019fd25f-c567-7fea-9cd4-cb7ff7012adc" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_StockholdersEquity"/>
    <link:loc xlink:type="locator" xlink:label="loc_sbcf_StockholdersEquityBeforeAccumulatedOtherComprehensiveIncome_019fd25f-c567-75a3-91aa-35718267b90f" xlink:href="sbcf-20260930.xsd#sbcf_StockholdersEquityBeforeAccumulatedOtherComprehensiveIncome"/>
    <link:calculationArc order="1" weight="1.0" xlink:arcrole="https://xbrl.org/2023/arcrole/summation-item" xlink:from="loc_us-gaap_StockholdersEquity_019fd25f-c567-7fea-9cd4-cb7ff7012adc" xlink:to="loc_sbcf_StockholdersEquityBeforeAccumulatedOtherComprehensiveIncome_019fd25f-c567-75a3-91aa-35718267b90f" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AccumulatedOtherComprehensiveIncomeLossNetOfTax_019fd25f-c567-7948-ab3c-451a8b433b54" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_AccumulatedOtherComprehensiveIncomeLossNetOfTax"/>
    <link:calculationArc order="2" weight="1.0" xlink:arcrole="https://xbrl.org/2023/arcrole/summation-item" xlink:from="loc_us-gaap_StockholdersEquity_019fd25f-c567-7fea-9cd4-cb7ff7012adc" xlink:to="loc_us-gaap_AccumulatedOtherComprehensiveIncomeLossNetOfTax_019fd25f-c567-7948-ab3c-451a8b433b54" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_Liabilities_019fd25f-c567-7e6f-a08f-337c4332e4eb" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_Liabilities"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_OtherLiabilities_019fd25f-c567-75ef-9d0e-631481fe709a" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_OtherLiabilities"/>
    <link:calculationArc order="1" weight="1.0" xlink:arcrole="https://xbrl.org/2023/arcrole/summation-item" xlink:from="loc_us-gaap_Liabilities_019fd25f-c567-7e6f-a08f-337c4332e4eb" xlink:to="loc_us-gaap_OtherLiabilities_019fd25f-c567-75ef-9d0e-631481fe709a" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_Deposits_019fd25f-c567-70bd-a91c-87cf67987966" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_Deposits"/>
    <link:calculationArc order="2" weight="1.0" xlink:arcrole="https://xbrl.org/2023/arcrole/summation-item" xlink:from="loc_us-gaap_Liabilities_019fd25f-c567-7e6f-a08f-337c4332e4eb" xlink:to="loc_us-gaap_Deposits_019fd25f-c567-70bd-a91c-87cf67987966" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_SecuritiesSoldUnderAgreementsToRepurchase_019fd25f-c567-7706-80b6-c713eea33b12" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_SecuritiesSoldUnderAgreementsToRepurchase"/>
    <link:calculationArc order="3" weight="1.0" xlink:arcrole="https://xbrl.org/2023/arcrole/summation-item" xlink:from="loc_us-gaap_Liabilities_019fd25f-c567-7e6f-a08f-337c4332e4eb" xlink:to="loc_us-gaap_SecuritiesSoldUnderAgreementsToRepurchase_019fd25f-c567-7706-80b6-c713eea33b12" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LongTermDebt_019fd25f-c567-70e1-84bc-084af4223728" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_LongTermDebt"/>
    <link:calculationArc order="4" weight="1.0" xlink:arcrole="https://xbrl.org/2023/arcrole/summation-item" xlink:from="loc_us-gaap_Liabilities_019fd25f-c567-7e6f-a08f-337c4332e4eb" xlink:to="loc_us-gaap_LongTermDebt_019fd25f-c567-70e1-84bc-084af4223728" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AdvancesFromFederalHomeLoanBanks_019fd25f-c567-73be-adca-f4e0b3e6cf45" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_AdvancesFromFederalHomeLoanBanks"/>
    <link:calculationArc order="5" weight="1.0" xlink:arcrole="https://xbrl.org/2023/arcrole/summation-item" xlink:from="loc_us-gaap_Liabilities_019fd25f-c567-7e6f-a08f-337c4332e4eb" xlink:to="loc_us-gaap_AdvancesFromFederalHomeLoanBanks_019fd25f-c567-73be-adca-f4e0b3e6cf45" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LiabilitiesAndStockholdersEquity_019fd25f-c567-7245-a12f-25f4700a5b69" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_LiabilitiesAndStockholdersEquity"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_Liabilities_019fd25f-c567-7f07-8b3c-3834179e00db" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_Liabilities"/>
    <link:calculationArc order="1" weight="1.0" xlink:arcrole="https://xbrl.org/2023/arcrole/summation-item" xlink:from="loc_us-gaap_LiabilitiesAndStockholdersEquity_019fd25f-c567-7245-a12f-25f4700a5b69" xlink:to="loc_us-gaap_Liabilities_019fd25f-c567-7f07-8b3c-3834179e00db" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_StockholdersEquity_019fd25f-c567-7733-a628-efd1b701fe6b" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_StockholdersEquity"/>
    <link:calculationArc order="2" weight="1.0" xlink:arcrole="https://xbrl.org/2023/arcrole/summation-item" xlink:from="loc_us-gaap_LiabilitiesAndStockholdersEquity_019fd25f-c567-7245-a12f-25f4700a5b69" xlink:to="loc_us-gaap_StockholdersEquity_019fd25f-c567-7733-a628-efd1b701fe6b" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_TemporaryEquityCarryingAmountAttributableToParent_019fd25f-c567-71e6-86c1-0e3572824d15" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_TemporaryEquityCarryingAmountAttributableToParent"/>
    <link:calculationArc order="3" weight="1.0" xlink:arcrole="https://xbrl.org/2023/arcrole/summation-item" xlink:from="loc_us-gaap_LiabilitiesAndStockholdersEquity_019fd25f-c567-7245-a12f-25f4700a5b69" xlink:to="loc_us-gaap_TemporaryEquityCarryingAmountAttributableToParent_019fd25f-c567-71e6-86c1-0e3572824d15" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_Assets_019fd25f-c567-7500-807b-af8082202158" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_Assets"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CashAndCashEquivalentsAtCarryingValue_019fd25f-c567-7020-861d-1b4942a0ee4c" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_CashAndCashEquivalentsAtCarryingValue"/>
    <link:calculationArc order="1" weight="1.0" xlink:arcrole="https://xbrl.org/2023/arcrole/summation-item" xlink:from="loc_us-gaap_Assets_019fd25f-c567-7500-807b-af8082202158" xlink:to="loc_us-gaap_CashAndCashEquivalentsAtCarryingValue_019fd25f-c567-7020-861d-1b4942a0ee4c" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_sbcf_TimeDepositsWithOtherBanks_019fd25f-c567-7600-a58c-8542aa269a0c" xlink:href="sbcf-20260930.xsd#sbcf_TimeDepositsWithOtherBanks"/>
    <link:calculationArc order="2" weight="1.0" xlink:arcrole="https://xbrl.org/2023/arcrole/summation-item" xlink:from="loc_us-gaap_Assets_019fd25f-c567-7500-807b-af8082202158" xlink:to="loc_sbcf_TimeDepositsWithOtherBanks_019fd25f-c567-7600-a58c-8542aa269a0c" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_Investments_019fd25f-c567-7eda-96b7-dc847c822185" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_Investments"/>
    <link:calculationArc order="3" weight="1.0" xlink:arcrole="https://xbrl.org/2023/arcrole/summation-item" xlink:from="loc_us-gaap_Assets_019fd25f-c567-7500-807b-af8082202158" xlink:to="loc_us-gaap_Investments_019fd25f-c567-7eda-96b7-dc847c822185" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FinancingReceivableExcludingAccruedInterestAfterAllowanceForCreditLoss_019fd25f-c567-71d2-8487-4fc6d94f6290" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_FinancingReceivableExcludingAccruedInterestAfterAllowanceForCreditLoss"/>
    <link:calculationArc order="4" weight="1.0" xlink:arcrole="https://xbrl.org/2023/arcrole/summation-item" xlink:from="loc_us-gaap_Assets_019fd25f-c567-7500-807b-af8082202158" xlink:to="loc_us-gaap_FinancingReceivableExcludingAccruedInterestAfterAllowanceForCreditLoss_019fd25f-c567-71d2-8487-4fc6d94f6290" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PropertyPlantAndEquipmentNet_019fd25f-c567-738e-b191-d0f67038f82b" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_PropertyPlantAndEquipmentNet"/>
    <link:calculationArc order="5" weight="1.0" xlink:arcrole="https://xbrl.org/2023/arcrole/summation-item" xlink:from="loc_us-gaap_Assets_019fd25f-c567-7500-807b-af8082202158" xlink:to="loc_us-gaap_PropertyPlantAndEquipmentNet_019fd25f-c567-738e-b191-d0f67038f82b" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_Goodwill_019fd25f-c567-76cc-a590-ba58431d4cc7" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_Goodwill"/>
    <link:calculationArc order="6" weight="1.0" xlink:arcrole="https://xbrl.org/2023/arcrole/summation-item" xlink:from="loc_us-gaap_Assets_019fd25f-c567-7500-807b-af8082202158" xlink:to="loc_us-gaap_Goodwill_019fd25f-c567-76cc-a590-ba58431d4cc7" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_IntangibleAssetsNetExcludingGoodwill_019fd25f-c567-779f-be05-c2846bc1dff6" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_IntangibleAssetsNetExcludingGoodwill"/>
    <link:calculationArc order="7" weight="1.0" xlink:arcrole="https://xbrl.org/2023/arcrole/summation-item" xlink:from="loc_us-gaap_Assets_019fd25f-c567-7500-807b-af8082202158" xlink:to="loc_us-gaap_IntangibleAssetsNetExcludingGoodwill_019fd25f-c567-779f-be05-c2846bc1dff6" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_BankOwnedLifeInsurance_019fd25f-c567-7995-8eb8-d82c7041652a" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_BankOwnedLifeInsurance"/>
    <link:calculationArc order="8" weight="1.0" xlink:arcrole="https://xbrl.org/2023/arcrole/summation-item" xlink:from="loc_us-gaap_Assets_019fd25f-c567-7500-807b-af8082202158" xlink:to="loc_us-gaap_BankOwnedLifeInsurance_019fd25f-c567-7995-8eb8-d82c7041652a" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DeferredIncomeTaxAssetsNet_019fd25f-c567-74e5-88bf-ba935fa0ff46" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_DeferredIncomeTaxAssetsNet"/>
    <link:calculationArc order="9" weight="1.0" xlink:arcrole="https://xbrl.org/2023/arcrole/summation-item" xlink:from="loc_us-gaap_Assets_019fd25f-c567-7500-807b-af8082202158" xlink:to="loc_us-gaap_DeferredIncomeTaxAssetsNet_019fd25f-c567-74e5-88bf-ba935fa0ff46" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_OtherAssets_019fd25f-c567-7820-9e17-f174f2e3f2f6" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_OtherAssets"/>
    <link:calculationArc order="10" weight="1.0" xlink:arcrole="https://xbrl.org/2023/arcrole/summation-item" xlink:from="loc_us-gaap_Assets_019fd25f-c567-7500-807b-af8082202158" xlink:to="loc_us-gaap_OtherAssets_019fd25f-c567-7820-9e17-f174f2e3f2f6" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LoansReceivableHeldForSaleNetNotPartOfDisposalGroup_019fd25f-c567-7e90-a4ff-ea91b2ee2589" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_LoansReceivableHeldForSaleNetNotPartOfDisposalGroup"/>
    <link:calculationArc order="11" weight="1.0" xlink:arcrole="https://xbrl.org/2023/arcrole/summation-item" xlink:from="loc_us-gaap_Assets_019fd25f-c567-7500-807b-af8082202158" xlink:to="loc_us-gaap_LoansReceivableHeldForSaleNetNotPartOfDisposalGroup_019fd25f-c567-7e90-a4ff-ea91b2ee2589" xlink:type="arc"/>
  </link:calculationLink>
  <link:roleRef roleURI="http://www.seacoastbanking.com/role/CONSOLIDATEDSTATEMENTSOFCASHFLOWSUnaudited" xlink:type="simple" xlink:href="sbcf-20260930.xsd#CONSOLIDATEDSTATEMENTSOFCASHFLOWSUnaudited"/>
  <link:calculationLink xlink:role="http://www.seacoastbanking.com/role/CONSOLIDATEDSTATEMENTSOFCASHFLOWSUnaudited" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalentsPeriodIncreaseDecreaseIncludingExchangeRateEffect_019fd25f-c567-7f47-aa1a-cc1078d4c9f8" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalentsPeriodIncreaseDecreaseIncludingExchangeRateEffect"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_NetCashProvidedByUsedInFinancingActivities_019fd25f-c567-7fa7-a02c-1feb1a656a08" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_NetCashProvidedByUsedInFinancingActivities"/>
    <link:calculationArc order="1" weight="1.0" xlink:arcrole="https://xbrl.org/2023/arcrole/summation-item" xlink:from="loc_us-gaap_CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalentsPeriodIncreaseDecreaseIncludingExchangeRateEffect_019fd25f-c567-7f47-aa1a-cc1078d4c9f8" xlink:to="loc_us-gaap_NetCashProvidedByUsedInFinancingActivities_019fd25f-c567-7fa7-a02c-1feb1a656a08" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_NetCashProvidedByUsedInOperatingActivities_019fd25f-c567-7ea8-8eb6-20e1b01b57cc" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_NetCashProvidedByUsedInOperatingActivities"/>
    <link:calculationArc order="2" weight="1.0" xlink:arcrole="https://xbrl.org/2023/arcrole/summation-item" xlink:from="loc_us-gaap_CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalentsPeriodIncreaseDecreaseIncludingExchangeRateEffect_019fd25f-c567-7f47-aa1a-cc1078d4c9f8" xlink:to="loc_us-gaap_NetCashProvidedByUsedInOperatingActivities_019fd25f-c567-7ea8-8eb6-20e1b01b57cc" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_NetCashProvidedByUsedInInvestingActivities_019fd25f-c567-7879-b024-f920503985a1" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_NetCashProvidedByUsedInInvestingActivities"/>
    <link:calculationArc order="3" weight="1.0" xlink:arcrole="https://xbrl.org/2023/arcrole/summation-item" xlink:from="loc_us-gaap_CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalentsPeriodIncreaseDecreaseIncludingExchangeRateEffect_019fd25f-c567-7f47-aa1a-cc1078d4c9f8" xlink:to="loc_us-gaap_NetCashProvidedByUsedInInvestingActivities_019fd25f-c567-7879-b024-f920503985a1" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_NetCashProvidedByUsedInFinancingActivities_019fd25f-c567-7d9c-a12c-9eadc4e52c06" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_NetCashProvidedByUsedInFinancingActivities"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RepaymentsOfFederalHomeLoanBankBorrowings_019fd25f-c567-7b7c-974e-b4e8daef14ce" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_RepaymentsOfFederalHomeLoanBankBorrowings"/>
    <link:calculationArc order="1" weight="-1.0" xlink:arcrole="https://xbrl.org/2023/arcrole/summation-item" xlink:from="loc_us-gaap_NetCashProvidedByUsedInFinancingActivities_019fd25f-c567-7d9c-a12c-9eadc4e52c06" xlink:to="loc_us-gaap_RepaymentsOfFederalHomeLoanBankBorrowings_019fd25f-c567-7b7c-974e-b4e8daef14ce" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ProceedsFromStockPlans_019fd25f-c567-7069-958a-e0a2ae6b0ed6" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_ProceedsFromStockPlans"/>
    <link:calculationArc order="2" weight="1.0" xlink:arcrole="https://xbrl.org/2023/arcrole/summation-item" xlink:from="loc_us-gaap_NetCashProvidedByUsedInFinancingActivities_019fd25f-c567-7d9c-a12c-9eadc4e52c06" xlink:to="loc_us-gaap_ProceedsFromStockPlans_019fd25f-c567-7069-958a-e0a2ae6b0ed6" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PaymentsOfDividendsPreferredStockAndPreferenceStock_019fd25f-c567-7971-9f5f-f005eb93870e" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_PaymentsOfDividendsPreferredStockAndPreferenceStock"/>
    <link:calculationArc order="3" weight="-1.0" xlink:arcrole="https://xbrl.org/2023/arcrole/summation-item" xlink:from="loc_us-gaap_NetCashProvidedByUsedInFinancingActivities_019fd25f-c567-7d9c-a12c-9eadc4e52c06" xlink:to="loc_us-gaap_PaymentsOfDividendsPreferredStockAndPreferenceStock_019fd25f-c567-7971-9f5f-f005eb93870e" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_IncreaseDecreaseInDeposits_019fd25f-c567-7d77-9485-426e351014f1" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_IncreaseDecreaseInDeposits"/>
    <link:calculationArc order="4" weight="1.0" xlink:arcrole="https://xbrl.org/2023/arcrole/summation-item" xlink:from="loc_us-gaap_NetCashProvidedByUsedInFinancingActivities_019fd25f-c567-7d9c-a12c-9eadc4e52c06" xlink:to="loc_us-gaap_IncreaseDecreaseInDeposits_019fd25f-c567-7d77-9485-426e351014f1" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ProceedsFromFederalHomeLoanBankBorrowings_019fd25f-c567-7dd6-b8ad-73bda0c5a334" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_ProceedsFromFederalHomeLoanBankBorrowings"/>
    <link:calculationArc order="5" weight="1.0" xlink:arcrole="https://xbrl.org/2023/arcrole/summation-item" xlink:from="loc_us-gaap_NetCashProvidedByUsedInFinancingActivities_019fd25f-c567-7d9c-a12c-9eadc4e52c06" xlink:to="loc_us-gaap_ProceedsFromFederalHomeLoanBankBorrowings_019fd25f-c567-7dd6-b8ad-73bda0c5a334" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PaymentsForRepurchaseOfCommonStock_019fd25f-c567-7c9b-a93c-54f4409eff02" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_PaymentsForRepurchaseOfCommonStock"/>
    <link:calculationArc order="6" weight="-1.0" xlink:arcrole="https://xbrl.org/2023/arcrole/summation-item" xlink:from="loc_us-gaap_NetCashProvidedByUsedInFinancingActivities_019fd25f-c567-7d9c-a12c-9eadc4e52c06" xlink:to="loc_us-gaap_PaymentsForRepurchaseOfCommonStock_019fd25f-c567-7c9b-a93c-54f4409eff02" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_IncreaseDecreaseInFederalFundsPurchasedAndSecuritiesSoldUnderAgreementsToRepurchaseNet_019fd25f-c567-7686-a979-e0e957e04964" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_IncreaseDecreaseInFederalFundsPurchasedAndSecuritiesSoldUnderAgreementsToRepurchaseNet"/>
    <link:calculationArc order="7" weight="1.0" xlink:arcrole="https://xbrl.org/2023/arcrole/summation-item" xlink:from="loc_us-gaap_NetCashProvidedByUsedInFinancingActivities_019fd25f-c567-7d9c-a12c-9eadc4e52c06" xlink:to="loc_us-gaap_IncreaseDecreaseInFederalFundsPurchasedAndSecuritiesSoldUnderAgreementsToRepurchaseNet_019fd25f-c567-7686-a979-e0e957e04964" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_IncreaseDecreaseInLoansFromOtherFederalHomeLoanBanks_019fd25f-c567-7ca5-b4e4-66310ca2cffc" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_IncreaseDecreaseInLoansFromOtherFederalHomeLoanBanks"/>
    <link:calculationArc order="8" weight="1.0" xlink:arcrole="https://xbrl.org/2023/arcrole/summation-item" xlink:from="loc_us-gaap_NetCashProvidedByUsedInFinancingActivities_019fd25f-c567-7d9c-a12c-9eadc4e52c06" xlink:to="loc_us-gaap_IncreaseDecreaseInLoansFromOtherFederalHomeLoanBanks_019fd25f-c567-7ca5-b4e4-66310ca2cffc" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_NetCashProvidedByUsedInInvestingActivities_019fd25f-c567-7150-8158-938c05681df1" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_NetCashProvidedByUsedInInvestingActivities"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ProceedsFromMaturitiesPrepaymentsAndCallsOfAvailableForSaleSecurities_019fd25f-c567-78bd-b4d6-e27a3cf284c5" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_ProceedsFromMaturitiesPrepaymentsAndCallsOfAvailableForSaleSecurities"/>
    <link:calculationArc order="1" weight="1.0" xlink:arcrole="https://xbrl.org/2023/arcrole/summation-item" xlink:from="loc_us-gaap_NetCashProvidedByUsedInInvestingActivities_019fd25f-c567-7150-8158-938c05681df1" xlink:to="loc_us-gaap_ProceedsFromMaturitiesPrepaymentsAndCallsOfAvailableForSaleSecurities_019fd25f-c567-78bd-b4d6-e27a3cf284c5" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ProceedsFromMaturitiesPrepaymentsAndCallsOfHeldToMaturitySecurities_019fd25f-c567-7842-83a7-38744654c48a" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_ProceedsFromMaturitiesPrepaymentsAndCallsOfHeldToMaturitySecurities"/>
    <link:calculationArc order="2" weight="1.0" xlink:arcrole="https://xbrl.org/2023/arcrole/summation-item" xlink:from="loc_us-gaap_NetCashProvidedByUsedInInvestingActivities_019fd25f-c567-7150-8158-938c05681df1" xlink:to="loc_us-gaap_ProceedsFromMaturitiesPrepaymentsAndCallsOfHeldToMaturitySecurities_019fd25f-c567-7842-83a7-38744654c48a" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ProceedsFromSaleOfAvailableForSaleSecuritiesDebt_019fd25f-c567-7c2a-8a1d-6b38e5c6702c" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_ProceedsFromSaleOfAvailableForSaleSecuritiesDebt"/>
    <link:calculationArc order="3" weight="1.0" xlink:arcrole="https://xbrl.org/2023/arcrole/summation-item" xlink:from="loc_us-gaap_NetCashProvidedByUsedInInvestingActivities_019fd25f-c567-7150-8158-938c05681df1" xlink:to="loc_us-gaap_ProceedsFromSaleOfAvailableForSaleSecuritiesDebt_019fd25f-c567-7c2a-8a1d-6b38e5c6702c" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PaymentsToAcquireAvailableForSaleSecuritiesDebt_019fd25f-c567-766e-a4e7-5770fa10150a" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_PaymentsToAcquireAvailableForSaleSecuritiesDebt"/>
    <link:calculationArc order="4" weight="-1.0" xlink:arcrole="https://xbrl.org/2023/arcrole/summation-item" xlink:from="loc_us-gaap_NetCashProvidedByUsedInInvestingActivities_019fd25f-c567-7150-8158-938c05681df1" xlink:to="loc_us-gaap_PaymentsToAcquireAvailableForSaleSecuritiesDebt_019fd25f-c567-766e-a4e7-5770fa10150a" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_sbcf_ProceedsFromSaleAndMaturityOfTimeDepositsHeldWithOtherBanks_019fd25f-c567-73b8-850f-1a2382c12e0b" xlink:href="sbcf-20260930.xsd#sbcf_ProceedsFromSaleAndMaturityOfTimeDepositsHeldWithOtherBanks"/>
    <link:calculationArc order="5" weight="1.0" xlink:arcrole="https://xbrl.org/2023/arcrole/summation-item" xlink:from="loc_us-gaap_NetCashProvidedByUsedInInvestingActivities_019fd25f-c567-7150-8158-938c05681df1" xlink:to="loc_sbcf_ProceedsFromSaleAndMaturityOfTimeDepositsHeldWithOtherBanks_019fd25f-c567-73b8-850f-1a2382c12e0b" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_sbcf_PaymentsForProceedsFromNewLoansAndPrincipalRepaymentsInvestingActivities_019fd25f-c567-7f2f-8109-a5fb36a61772" xlink:href="sbcf-20260930.xsd#sbcf_PaymentsForProceedsFromNewLoansAndPrincipalRepaymentsInvestingActivities"/>
    <link:calculationArc order="6" weight="-1.0" xlink:arcrole="https://xbrl.org/2023/arcrole/summation-item" xlink:from="loc_us-gaap_NetCashProvidedByUsedInInvestingActivities_019fd25f-c567-7150-8158-938c05681df1" xlink:to="loc_sbcf_PaymentsForProceedsFromNewLoansAndPrincipalRepaymentsInvestingActivities_019fd25f-c567-7f2f-8109-a5fb36a61772" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ProceedsFromSaleOfLoansHeldForInvestment_019fd25f-c567-7f1c-807e-b09db7c9fbd8" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_ProceedsFromSaleOfLoansHeldForInvestment"/>
    <link:calculationArc order="7" weight="1.0" xlink:arcrole="https://xbrl.org/2023/arcrole/summation-item" xlink:from="loc_us-gaap_NetCashProvidedByUsedInInvestingActivities_019fd25f-c567-7150-8158-938c05681df1" xlink:to="loc_us-gaap_ProceedsFromSaleOfLoansHeldForInvestment_019fd25f-c567-7f1c-807e-b09db7c9fbd8" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ProceedsFromSaleOfForeclosedAssets_019fd25f-c567-7afa-acb1-1928e3ebfe3e" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_ProceedsFromSaleOfForeclosedAssets"/>
    <link:calculationArc order="8" weight="1.0" xlink:arcrole="https://xbrl.org/2023/arcrole/summation-item" xlink:from="loc_us-gaap_NetCashProvidedByUsedInInvestingActivities_019fd25f-c567-7150-8158-938c05681df1" xlink:to="loc_us-gaap_ProceedsFromSaleOfForeclosedAssets_019fd25f-c567-7afa-acb1-1928e3ebfe3e" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ProceedsFromSaleOfFederalReserveStock_019fd25f-c567-71c8-99f6-682faa732839" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_ProceedsFromSaleOfFederalReserveStock"/>
    <link:calculationArc order="9" weight="1.0" xlink:arcrole="https://xbrl.org/2023/arcrole/summation-item" xlink:from="loc_us-gaap_NetCashProvidedByUsedInInvestingActivities_019fd25f-c567-7150-8158-938c05681df1" xlink:to="loc_us-gaap_ProceedsFromSaleOfFederalReserveStock_019fd25f-c567-71c8-99f6-682faa732839" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PaymentsToAcquireFederalReserveStock_019fd25f-c567-76a8-8fc0-6282f518d878" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_PaymentsToAcquireFederalReserveStock"/>
    <link:calculationArc order="10" weight="-1.0" xlink:arcrole="https://xbrl.org/2023/arcrole/summation-item" xlink:from="loc_us-gaap_NetCashProvidedByUsedInInvestingActivities_019fd25f-c567-7150-8158-938c05681df1" xlink:to="loc_us-gaap_PaymentsToAcquireFederalReserveStock_019fd25f-c567-76a8-8fc0-6282f518d878" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ProceedsFromLifeInsurancePolicies_019fd25f-c567-7891-8789-7539313938ed" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_ProceedsFromLifeInsurancePolicies"/>
    <link:calculationArc order="11" weight="1.0" xlink:arcrole="https://xbrl.org/2023/arcrole/summation-item" xlink:from="loc_us-gaap_NetCashProvidedByUsedInInvestingActivities_019fd25f-c567-7150-8158-938c05681df1" xlink:to="loc_us-gaap_ProceedsFromLifeInsurancePolicies_019fd25f-c567-7891-8789-7539313938ed" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_sbcf_NetCashFromAcquisitionNetOfPaidForPreferredStock_019fd25f-c567-7c95-a123-c2494a95a862" xlink:href="sbcf-20260930.xsd#sbcf_NetCashFromAcquisitionNetOfPaidForPreferredStock"/>
    <link:calculationArc order="12" weight="1.0" xlink:arcrole="https://xbrl.org/2023/arcrole/summation-item" xlink:from="loc_us-gaap_NetCashProvidedByUsedInInvestingActivities_019fd25f-c567-7150-8158-938c05681df1" xlink:to="loc_sbcf_NetCashFromAcquisitionNetOfPaidForPreferredStock_019fd25f-c567-7c95-a123-c2494a95a862" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_sbcf_AdditionsToBankPremisesAndEquipment_01a036ad-0160-7b73-8ad6-431662598dd3" xlink:href="sbcf-20260930.xsd#sbcf_AdditionsToBankPremisesAndEquipment"/>
    <link:calculationArc order="13" weight="-1.0" xlink:arcrole="https://xbrl.org/2023/arcrole/summation-item" xlink:from="loc_us-gaap_NetCashProvidedByUsedInInvestingActivities_019fd25f-c567-7150-8158-938c05681df1" xlink:to="loc_sbcf_AdditionsToBankPremisesAndEquipment_01a036ad-0160-7b73-8ad6-431662598dd3" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_NetCashProvidedByUsedInOperatingActivities_019fd25f-c567-74cf-a2ae-1a677c5012b3" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_NetCashProvidedByUsedInOperatingActivities"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_GainLossOnSalesOfConsumerLoans_019fd25f-c567-7ee3-af04-2d2fe44bef4b" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_GainLossOnSalesOfConsumerLoans"/>
    <link:calculationArc order="1" weight="-1.0" xlink:arcrole="https://xbrl.org/2023/arcrole/summation-item" xlink:from="loc_us-gaap_NetCashProvidedByUsedInOperatingActivities_019fd25f-c567-74cf-a2ae-1a677c5012b3" xlink:to="loc_us-gaap_GainLossOnSalesOfConsumerLoans_019fd25f-c567-7ee3-af04-2d2fe44bef4b" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DeferredIncomeTaxExpenseBenefit_019fd25f-c567-78f7-aa72-1d7324173f83" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_DeferredIncomeTaxExpenseBenefit"/>
    <link:calculationArc order="2" weight="1.0" xlink:arcrole="https://xbrl.org/2023/arcrole/summation-item" xlink:from="loc_us-gaap_NetCashProvidedByUsedInOperatingActivities_019fd25f-c567-74cf-a2ae-1a677c5012b3" xlink:to="loc_us-gaap_DeferredIncomeTaxExpenseBenefit_019fd25f-c567-78f7-aa72-1d7324173f83" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AccretionAmortizationOfDiscountsAndPremiumsInvestments_019fd25f-c567-75d3-a2f3-820279ae567e" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_AccretionAmortizationOfDiscountsAndPremiumsInvestments"/>
    <link:calculationArc order="3" weight="-1.0" xlink:arcrole="https://xbrl.org/2023/arcrole/summation-item" xlink:from="loc_us-gaap_NetCashProvidedByUsedInOperatingActivities_019fd25f-c567-74cf-a2ae-1a677c5012b3" xlink:to="loc_us-gaap_AccretionAmortizationOfDiscountsAndPremiumsInvestments_019fd25f-c567-75d3-a2f3-820279ae567e" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_IncreaseDecreaseInOtherOperatingLiabilities_019fd25f-c567-7191-9e4c-8e2615665e07" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_IncreaseDecreaseInOtherOperatingLiabilities"/>
    <link:calculationArc order="4" weight="1.0" xlink:arcrole="https://xbrl.org/2023/arcrole/summation-item" xlink:from="loc_us-gaap_NetCashProvidedByUsedInOperatingActivities_019fd25f-c567-74cf-a2ae-1a677c5012b3" xlink:to="loc_us-gaap_IncreaseDecreaseInOtherOperatingLiabilities_019fd25f-c567-7191-9e4c-8e2615665e07" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShareBasedCompensation_019fd25f-c567-74c4-bcc8-e69700369e9a" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_ShareBasedCompensation"/>
    <link:calculationArc order="5" weight="1.0" xlink:arcrole="https://xbrl.org/2023/arcrole/summation-item" xlink:from="loc_us-gaap_NetCashProvidedByUsedInOperatingActivities_019fd25f-c567-74cf-a2ae-1a677c5012b3" xlink:to="loc_us-gaap_ShareBasedCompensation_019fd25f-c567-74c4-bcc8-e69700369e9a" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_OperatingLeaseRightOfUseAssetAmortizationExpense_019fd25f-c567-7821-b38b-d061724a231c" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_OperatingLeaseRightOfUseAssetAmortizationExpense"/>
    <link:calculationArc order="6" weight="1.0" xlink:arcrole="https://xbrl.org/2023/arcrole/summation-item" xlink:from="loc_us-gaap_NetCashProvidedByUsedInOperatingActivities_019fd25f-c567-74cf-a2ae-1a677c5012b3" xlink:to="loc_us-gaap_OperatingLeaseRightOfUseAssetAmortizationExpense_019fd25f-c567-7821-b38b-d061724a231c" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PaymentsForOriginationOfMortgageLoansHeldForSale_019fd25f-c567-78d0-9b92-015771f039d0" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_PaymentsForOriginationOfMortgageLoansHeldForSale"/>
    <link:calculationArc order="7" weight="-1.0" xlink:arcrole="https://xbrl.org/2023/arcrole/summation-item" xlink:from="loc_us-gaap_NetCashProvidedByUsedInOperatingActivities_019fd25f-c567-74cf-a2ae-1a677c5012b3" xlink:to="loc_us-gaap_PaymentsForOriginationOfMortgageLoansHeldForSale_019fd25f-c567-78d0-9b92-015771f039d0" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_sbcf_SaleOfLoansDesignatedHeldForSale_019fd25f-c567-76bf-a30e-c85dea7ab91c" xlink:href="sbcf-20260930.xsd#sbcf_SaleOfLoansDesignatedHeldForSale"/>
    <link:calculationArc order="8" weight="1.0" xlink:arcrole="https://xbrl.org/2023/arcrole/summation-item" xlink:from="loc_us-gaap_NetCashProvidedByUsedInOperatingActivities_019fd25f-c567-74cf-a2ae-1a677c5012b3" xlink:to="loc_sbcf_SaleOfLoansDesignatedHeldForSale_019fd25f-c567-76bf-a30e-c85dea7ab91c" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_NetIncomeLoss_019fd25f-c567-79d4-97c2-6ccb3ed96d74" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_NetIncomeLoss"/>
    <link:calculationArc order="9" weight="1.0" xlink:arcrole="https://xbrl.org/2023/arcrole/summation-item" xlink:from="loc_us-gaap_NetCashProvidedByUsedInOperatingActivities_019fd25f-c567-74cf-a2ae-1a677c5012b3" xlink:to="loc_us-gaap_NetIncomeLoss_019fd25f-c567-79d4-97c2-6ccb3ed96d74" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_IncreaseDecreaseInOtherOperatingAssets_019fd25f-c567-700f-86e7-82c4734e35af" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_IncreaseDecreaseInOtherOperatingAssets"/>
    <link:calculationArc order="10" weight="-1.0" xlink:arcrole="https://xbrl.org/2023/arcrole/summation-item" xlink:from="loc_us-gaap_NetCashProvidedByUsedInOperatingActivities_019fd25f-c567-74cf-a2ae-1a677c5012b3" xlink:to="loc_us-gaap_IncreaseDecreaseInOtherOperatingAssets_019fd25f-c567-700f-86e7-82c4734e35af" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_sbcf_FinancingReceivableAndAccruedInterestReceivableCreditLossProvisionReversal_019fd25f-c567-78d1-a33c-a3343cc5b60d" xlink:href="sbcf-20260930.xsd#sbcf_FinancingReceivableAndAccruedInterestReceivableCreditLossProvisionReversal"/>
    <link:calculationArc order="11" weight="1.0" xlink:arcrole="https://xbrl.org/2023/arcrole/summation-item" xlink:from="loc_us-gaap_NetCashProvidedByUsedInOperatingActivities_019fd25f-c567-74cf-a2ae-1a677c5012b3" xlink:to="loc_sbcf_FinancingReceivableAndAccruedInterestReceivableCreditLossProvisionReversal_019fd25f-c567-78d1-a33c-a3343cc5b60d" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_Depreciation_019fd25f-c567-7a44-bef2-e30bd264c95c" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_Depreciation"/>
    <link:calculationArc order="12" weight="1.0" xlink:arcrole="https://xbrl.org/2023/arcrole/summation-item" xlink:from="loc_us-gaap_NetCashProvidedByUsedInOperatingActivities_019fd25f-c567-74cf-a2ae-1a677c5012b3" xlink:to="loc_us-gaap_Depreciation_019fd25f-c567-7a44-bef2-e30bd264c95c" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_MarketableSecuritiesGainLossExcludingOtherThanTemporaryImpairments_019fd25f-c567-71b8-b117-f02267868411" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_MarketableSecuritiesGainLossExcludingOtherThanTemporaryImpairments"/>
    <link:calculationArc order="13" weight="-1.0" xlink:arcrole="https://xbrl.org/2023/arcrole/summation-item" xlink:from="loc_us-gaap_NetCashProvidedByUsedInOperatingActivities_019fd25f-c567-74cf-a2ae-1a677c5012b3" xlink:to="loc_us-gaap_MarketableSecuritiesGainLossExcludingOtherThanTemporaryImpairments_019fd25f-c567-71b8-b117-f02267868411" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_sbcf_OtherAccretionAmortizationNet_019fd25f-c567-7b75-a779-175baaa834b6" xlink:href="sbcf-20260930.xsd#sbcf_OtherAccretionAmortizationNet"/>
    <link:calculationArc order="14" weight="-1.0" xlink:arcrole="https://xbrl.org/2023/arcrole/summation-item" xlink:from="loc_us-gaap_NetCashProvidedByUsedInOperatingActivities_019fd25f-c567-74cf-a2ae-1a677c5012b3" xlink:to="loc_sbcf_OtherAccretionAmortizationNet_019fd25f-c567-7b75-a779-175baaa834b6" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_sbcf_GainLossOnSaleAndWriteDownOfBankPremisesEquipmentAndOtherRealEstate_019fd25f-c567-7583-bc11-ba56ffab0bed" xlink:href="sbcf-20260930.xsd#sbcf_GainLossOnSaleAndWriteDownOfBankPremisesEquipmentAndOtherRealEstate"/>
    <link:calculationArc order="15" weight="-1.0" xlink:arcrole="https://xbrl.org/2023/arcrole/summation-item" xlink:from="loc_us-gaap_NetCashProvidedByUsedInOperatingActivities_019fd25f-c567-74cf-a2ae-1a677c5012b3" xlink:to="loc_sbcf_GainLossOnSaleAndWriteDownOfBankPremisesEquipmentAndOtherRealEstate_019fd25f-c567-7583-bc11-ba56ffab0bed" xlink:type="arc"/>
  </link:calculationLink>
  <link:roleRef roleURI="http://www.seacoastbanking.com/role/CONSOLIDATEDSTATEMENTSOFCONVERTIBLEPREFERREDSTOCKANDSHAREHOLDERSEQUITYUnaudited" xlink:type="simple" xlink:href="sbcf-20260930.xsd#CONSOLIDATEDSTATEMENTSOFCONVERTIBLEPREFERREDSTOCKANDSHAREHOLDERSEQUITYUnaudited"/>
  <link:calculationLink xlink:role="http://www.seacoastbanking.com/role/CONSOLIDATEDSTATEMENTSOFCONVERTIBLEPREFERREDSTOCKANDSHAREHOLDERSEQUITYUnaudited" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_StockIssuedDuringPeriodSharesPeriodIncreaseDecrease_019fd25f-c567-721e-a808-82c17abb2382" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_StockIssuedDuringPeriodSharesPeriodIncreaseDecrease"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_StockIssuedDuringPeriodSharesEmployeeBenefitPlan_019fd25f-c567-7ada-8e2f-d15085950831" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_StockIssuedDuringPeriodSharesEmployeeBenefitPlan"/>
    <link:calculationArc order="1" weight="1.0" xlink:arcrole="https://xbrl.org/2023/arcrole/summation-item" xlink:from="loc_us-gaap_StockIssuedDuringPeriodSharesPeriodIncreaseDecrease_019fd25f-c567-721e-a808-82c17abb2382" xlink:to="loc_us-gaap_StockIssuedDuringPeriodSharesEmployeeBenefitPlan_019fd25f-c567-7ada-8e2f-d15085950831" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_StockIssuedDuringPeriodSharesAcquisitions_01a036cf-0d42-7c9a-850a-7752b46a1a0d" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_StockIssuedDuringPeriodSharesAcquisitions"/>
    <link:calculationArc order="2" weight="1.0" xlink:arcrole="https://xbrl.org/2023/arcrole/summation-item" xlink:from="loc_us-gaap_StockIssuedDuringPeriodSharesPeriodIncreaseDecrease_019fd25f-c567-721e-a808-82c17abb2382" xlink:to="loc_us-gaap_StockIssuedDuringPeriodSharesAcquisitions_01a036cf-0d42-7c9a-850a-7752b46a1a0d" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_TreasuryStockSharesAcquired_01a049ad-17ea-7b62-91f1-e0b5a775ce19" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_TreasuryStockSharesAcquired"/>
    <link:calculationArc order="3" weight="-1.0" xlink:arcrole="https://xbrl.org/2023/arcrole/summation-item" xlink:from="loc_us-gaap_StockIssuedDuringPeriodSharesPeriodIncreaseDecrease_019fd25f-c567-721e-a808-82c17abb2382" xlink:to="loc_us-gaap_TreasuryStockSharesAcquired_01a049ad-17ea-7b62-91f1-e0b5a775ce19" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_StockholdersEquityPeriodIncreaseDecrease_019fd25f-c567-743e-9a0f-02d265c80ab6" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_StockholdersEquityPeriodIncreaseDecrease"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AdjustmentsToAdditionalPaidInCapitalSharebasedCompensationRequisiteServicePeriodRecognitionValue_019fd25f-c567-7d51-a0db-285c5269eb1a" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_AdjustmentsToAdditionalPaidInCapitalSharebasedCompensationRequisiteServicePeriodRecognitionValue"/>
    <link:calculationArc order="1" weight="1.0" xlink:arcrole="https://xbrl.org/2023/arcrole/summation-item" xlink:from="loc_us-gaap_StockholdersEquityPeriodIncreaseDecrease_019fd25f-c567-743e-9a0f-02d265c80ab6" xlink:to="loc_us-gaap_AdjustmentsToAdditionalPaidInCapitalSharebasedCompensationRequisiteServicePeriodRecognitionValue_019fd25f-c567-7d51-a0db-285c5269eb1a" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_sbcf_StockIssuedDuringPeriodValueCommonStockTransactionsRelatedToEmployeeBenefitPlans_019fd25f-c567-758e-b926-34663ce55cbe" xlink:href="sbcf-20260930.xsd#sbcf_StockIssuedDuringPeriodValueCommonStockTransactionsRelatedToEmployeeBenefitPlans"/>
    <link:calculationArc order="2" weight="1.0" xlink:arcrole="https://xbrl.org/2023/arcrole/summation-item" xlink:from="loc_us-gaap_StockholdersEquityPeriodIncreaseDecrease_019fd25f-c567-743e-9a0f-02d265c80ab6" xlink:to="loc_sbcf_StockIssuedDuringPeriodValueCommonStockTransactionsRelatedToEmployeeBenefitPlans_019fd25f-c567-758e-b926-34663ce55cbe" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ComprehensiveIncomeNetOfTax_01a036ce-2ba3-7954-805f-2199a0bb90b9" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_ComprehensiveIncomeNetOfTax"/>
    <link:calculationArc order="3" weight="1.0" xlink:arcrole="https://xbrl.org/2023/arcrole/summation-item" xlink:from="loc_us-gaap_StockholdersEquityPeriodIncreaseDecrease_019fd25f-c567-743e-9a0f-02d265c80ab6" xlink:to="loc_us-gaap_ComprehensiveIncomeNetOfTax_01a036ce-2ba3-7954-805f-2199a0bb90b9" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DividendsCommonStock_019fd25f-c567-74a7-a379-5d34578eeb92" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_DividendsCommonStock"/>
    <link:calculationArc order="4" weight="-1.0" xlink:arcrole="https://xbrl.org/2023/arcrole/summation-item" xlink:from="loc_us-gaap_StockholdersEquityPeriodIncreaseDecrease_019fd25f-c567-743e-9a0f-02d265c80ab6" xlink:to="loc_us-gaap_DividendsCommonStock_019fd25f-c567-74a7-a379-5d34578eeb92" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DividendsPreferredStock_019fd25f-c567-701b-95ba-ffc3fef6209c" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_DividendsPreferredStock"/>
    <link:calculationArc order="5" weight="-1.0" xlink:arcrole="https://xbrl.org/2023/arcrole/summation-item" xlink:from="loc_us-gaap_StockholdersEquityPeriodIncreaseDecrease_019fd25f-c567-743e-9a0f-02d265c80ab6" xlink:to="loc_us-gaap_DividendsPreferredStock_019fd25f-c567-701b-95ba-ffc3fef6209c" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_TreasuryStockValueAcquiredCostMethod_019fd25f-c567-7f1b-8605-81233f61e46b" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_TreasuryStockValueAcquiredCostMethod"/>
    <link:calculationArc order="6" weight="-1.0" xlink:arcrole="https://xbrl.org/2023/arcrole/summation-item" xlink:from="loc_us-gaap_StockholdersEquityPeriodIncreaseDecrease_019fd25f-c567-743e-9a0f-02d265c80ab6" xlink:to="loc_us-gaap_TreasuryStockValueAcquiredCostMethod_019fd25f-c567-7f1b-8605-81233f61e46b" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_StockIssuedDuringPeriodValueAcquisitions_019fd25f-c567-77a7-86b8-ec1c5be40111" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_StockIssuedDuringPeriodValueAcquisitions"/>
    <link:calculationArc order="7" weight="1.0" xlink:arcrole="https://xbrl.org/2023/arcrole/summation-item" xlink:from="loc_us-gaap_StockholdersEquityPeriodIncreaseDecrease_019fd25f-c567-743e-9a0f-02d265c80ab6" xlink:to="loc_us-gaap_StockIssuedDuringPeriodValueAcquisitions_019fd25f-c567-77a7-86b8-ec1c5be40111" xlink:type="arc"/>
  </link:calculationLink>
  <link:roleRef roleURI="http://www.seacoastbanking.com/role/EarningsperShareScheduleofEarningsPerShareBasicandDilutedDetails" xlink:type="simple" xlink:href="sbcf-20260930.xsd#EarningsperShareScheduleofEarningsPerShareBasicandDilutedDetails"/>
  <link:calculationLink xlink:role="http://www.seacoastbanking.com/role/EarningsperShareScheduleofEarningsPerShareBasicandDilutedDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_NetIncomeLossAvailableToCommonStockholdersBasic_019fd25f-c567-7b8d-af3c-1dc0ac8b551b" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_NetIncomeLossAvailableToCommonStockholdersBasic"/>
    <link:loc xlink:type="locator" xlink:label="loc_sbcf_NetIncomeLossAvailableToCommonStockholdersBeforeEarningsLossAllocatedToParticipatingSecurities_019fd25f-c567-7398-87a1-83ead2846473" xlink:href="sbcf-20260930.xsd#sbcf_NetIncomeLossAvailableToCommonStockholdersBeforeEarningsLossAllocatedToParticipatingSecurities"/>
    <link:calculationArc order="1" weight="1.0" xlink:arcrole="https://xbrl.org/2023/arcrole/summation-item" xlink:from="loc_us-gaap_NetIncomeLossAvailableToCommonStockholdersBasic_019fd25f-c567-7b8d-af3c-1dc0ac8b551b" xlink:to="loc_sbcf_NetIncomeLossAvailableToCommonStockholdersBeforeEarningsLossAllocatedToParticipatingSecurities_019fd25f-c567-7398-87a1-83ead2846473" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_UndistributedEarningsLossAllocatedToParticipatingSecuritiesBasic_019fd25f-c567-7399-9978-95677ba0a472" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_UndistributedEarningsLossAllocatedToParticipatingSecuritiesBasic"/>
    <link:calculationArc order="2" weight="-1.0" xlink:arcrole="https://xbrl.org/2023/arcrole/summation-item" xlink:from="loc_us-gaap_NetIncomeLossAvailableToCommonStockholdersBasic_019fd25f-c567-7b8d-af3c-1dc0ac8b551b" xlink:to="loc_us-gaap_UndistributedEarningsLossAllocatedToParticipatingSecuritiesBasic_019fd25f-c567-7399-9978-95677ba0a472" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding_019fd25f-c567-77d7-9e42-388bbaa63482" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_WeightedAverageNumberOfSharesOutstandingBasic_019fd25f-c567-7a2f-9be2-33a8b6811185" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_WeightedAverageNumberOfSharesOutstandingBasic"/>
    <link:calculationArc order="1" weight="1.0" xlink:arcrole="https://xbrl.org/2023/arcrole/summation-item" xlink:from="loc_us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding_019fd25f-c567-77d7-9e42-388bbaa63482" xlink:to="loc_us-gaap_WeightedAverageNumberOfSharesOutstandingBasic_019fd25f-c567-7a2f-9be2-33a8b6811185" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_WeightedAverageNumberDilutedSharesOutstandingAdjustment_019fd25f-c567-7a56-b2c0-96db3a635834" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_WeightedAverageNumberDilutedSharesOutstandingAdjustment"/>
    <link:calculationArc order="2" weight="1.0" xlink:arcrole="https://xbrl.org/2023/arcrole/summation-item" xlink:from="loc_us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding_019fd25f-c567-77d7-9e42-388bbaa63482" xlink:to="loc_us-gaap_WeightedAverageNumberDilutedSharesOutstandingAdjustment_019fd25f-c567-7a56-b2c0-96db3a635834" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_NetIncomeLossAvailableToCommonStockholdersDiluted_019fd25f-c567-7a11-a43f-d056b736b3cf" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_NetIncomeLossAvailableToCommonStockholdersDiluted"/>
    <link:loc xlink:type="locator" xlink:label="loc_sbcf_NetIncomeLossAvailableToCommonStockholdersBeforeEarningsLossAllocatedToParticipatingSecurities_019fd25f-c567-7978-89d8-7ccea2be1450" xlink:href="sbcf-20260930.xsd#sbcf_NetIncomeLossAvailableToCommonStockholdersBeforeEarningsLossAllocatedToParticipatingSecurities"/>
    <link:calculationArc order="1" weight="1.0" xlink:arcrole="https://xbrl.org/2023/arcrole/summation-item" xlink:from="loc_us-gaap_NetIncomeLossAvailableToCommonStockholdersDiluted_019fd25f-c567-7a11-a43f-d056b736b3cf" xlink:to="loc_sbcf_NetIncomeLossAvailableToCommonStockholdersBeforeEarningsLossAllocatedToParticipatingSecurities_019fd25f-c567-7978-89d8-7ccea2be1450" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_UndistributedEarningsLossAllocatedToParticipatingSecuritiesDiluted_019fd25f-c567-7e1a-a796-ef4c5e378545" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_UndistributedEarningsLossAllocatedToParticipatingSecuritiesDiluted"/>
    <link:calculationArc order="2" weight="-1.0" xlink:arcrole="https://xbrl.org/2023/arcrole/summation-item" xlink:from="loc_us-gaap_NetIncomeLossAvailableToCommonStockholdersDiluted_019fd25f-c567-7a11-a43f-d056b736b3cf" xlink:to="loc_us-gaap_UndistributedEarningsLossAllocatedToParticipatingSecuritiesDiluted_019fd25f-c567-7e1a-a796-ef4c5e378545" xlink:type="arc"/>
  </link:calculationLink>
  <link:roleRef roleURI="http://www.seacoastbanking.com/role/SecuritiesScheduleofAmortizedCostandFairValueofSecuritiesAvailableforSaleandHeldforInvestmentDetails" xlink:type="simple" xlink:href="sbcf-20260930.xsd#SecuritiesScheduleofAmortizedCostandFairValueofSecuritiesAvailableforSaleandHeldforInvestmentDetails"/>
  <link:calculationLink xlink:role="http://www.seacoastbanking.com/role/SecuritiesScheduleofAmortizedCostandFairValueofSecuritiesAvailableforSaleandHeldforInvestmentDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtSecuritiesHeldToMaturityExcludingAccruedInterestAfterAllowanceForCreditLoss_019fd25f-c567-7aec-aedc-8679cfc257e1" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_DebtSecuritiesHeldToMaturityExcludingAccruedInterestAfterAllowanceForCreditLoss"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_HeldToMaturitySecuritiesAccumulatedUnrecognizedHoldingGain_019fd25f-c567-7083-89c3-8aecb52be125" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_HeldToMaturitySecuritiesAccumulatedUnrecognizedHoldingGain"/>
    <link:calculationArc order="1" weight="-1.0" xlink:arcrole="https://xbrl.org/2023/arcrole/summation-item" xlink:from="loc_us-gaap_DebtSecuritiesHeldToMaturityExcludingAccruedInterestAfterAllowanceForCreditLoss_019fd25f-c567-7aec-aedc-8679cfc257e1" xlink:to="loc_us-gaap_HeldToMaturitySecuritiesAccumulatedUnrecognizedHoldingGain_019fd25f-c567-7083-89c3-8aecb52be125" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_HeldToMaturitySecuritiesAccumulatedUnrecognizedHoldingLoss_019fd25f-c567-79f1-8646-daf3693e6bba" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_HeldToMaturitySecuritiesAccumulatedUnrecognizedHoldingLoss"/>
    <link:calculationArc order="2" weight="1.0" xlink:arcrole="https://xbrl.org/2023/arcrole/summation-item" xlink:from="loc_us-gaap_DebtSecuritiesHeldToMaturityExcludingAccruedInterestAfterAllowanceForCreditLoss_019fd25f-c567-7aec-aedc-8679cfc257e1" xlink:to="loc_us-gaap_HeldToMaturitySecuritiesAccumulatedUnrecognizedHoldingLoss_019fd25f-c567-79f1-8646-daf3693e6bba" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_HeldToMaturitySecuritiesFairValue_019fd25f-c567-77d4-8fc6-32977cd59084" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_HeldToMaturitySecuritiesFairValue"/>
    <link:calculationArc order="3" weight="1.0" xlink:arcrole="https://xbrl.org/2023/arcrole/summation-item" xlink:from="loc_us-gaap_DebtSecuritiesHeldToMaturityExcludingAccruedInterestAfterAllowanceForCreditLoss_019fd25f-c567-7aec-aedc-8679cfc257e1" xlink:to="loc_us-gaap_HeldToMaturitySecuritiesFairValue_019fd25f-c567-77d4-8fc6-32977cd59084" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtSecuritiesAvailableForSaleAmortizedCostExcludingAccruedInterestAfterAllowanceForCreditLoss_019fd25f-c567-70ef-adaf-0edb571dfd24" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_DebtSecuritiesAvailableForSaleAmortizedCostExcludingAccruedInterestAfterAllowanceForCreditLoss"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AvailableForSaleDebtSecuritiesAccumulatedGrossUnrealizedGainBeforeTax_019fd25f-c567-7919-986c-f378be120277" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_AvailableForSaleDebtSecuritiesAccumulatedGrossUnrealizedGainBeforeTax"/>
    <link:calculationArc order="1" weight="-1.0" xlink:arcrole="https://xbrl.org/2023/arcrole/summation-item" xlink:from="loc_us-gaap_DebtSecuritiesAvailableForSaleAmortizedCostExcludingAccruedInterestAfterAllowanceForCreditLoss_019fd25f-c567-70ef-adaf-0edb571dfd24" xlink:to="loc_us-gaap_AvailableForSaleDebtSecuritiesAccumulatedGrossUnrealizedGainBeforeTax_019fd25f-c567-7919-986c-f378be120277" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AvailableForSaleDebtSecuritiesAccumulatedGrossUnrealizedLossBeforeTax_019fd25f-c567-7ad8-b853-9e50d35f65d5" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_AvailableForSaleDebtSecuritiesAccumulatedGrossUnrealizedLossBeforeTax"/>
    <link:calculationArc order="2" weight="1.0" xlink:arcrole="https://xbrl.org/2023/arcrole/summation-item" xlink:from="loc_us-gaap_DebtSecuritiesAvailableForSaleAmortizedCostExcludingAccruedInterestAfterAllowanceForCreditLoss_019fd25f-c567-70ef-adaf-0edb571dfd24" xlink:to="loc_us-gaap_AvailableForSaleDebtSecuritiesAccumulatedGrossUnrealizedLossBeforeTax_019fd25f-c567-7ad8-b853-9e50d35f65d5" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtSecuritiesAvailableForSaleExcludingAccruedInterest_019fd25f-c567-79e6-8b65-79f63d1a3b3a" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_DebtSecuritiesAvailableForSaleExcludingAccruedInterest"/>
    <link:calculationArc order="3" weight="1.0" xlink:arcrole="https://xbrl.org/2023/arcrole/summation-item" xlink:from="loc_us-gaap_DebtSecuritiesAvailableForSaleAmortizedCostExcludingAccruedInterestAfterAllowanceForCreditLoss_019fd25f-c567-70ef-adaf-0edb571dfd24" xlink:to="loc_us-gaap_DebtSecuritiesAvailableForSaleExcludingAccruedInterest_019fd25f-c567-79e6-8b65-79f63d1a3b3a" xlink:type="arc"/>
  </link:calculationLink>
  <link:roleRef roleURI="http://www.seacoastbanking.com/role/SecuritiesScheduleofAmortizedCostandFairValueofSecuritiesbyContractualMaturityDetails" xlink:type="simple" xlink:href="sbcf-20260930.xsd#SecuritiesScheduleofAmortizedCostandFairValueofSecuritiesbyContractualMaturityDetails"/>
  <link:calculationLink xlink:role="http://www.seacoastbanking.com/role/SecuritiesScheduleofAmortizedCostandFairValueofSecuritiesbyContractualMaturityDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_HeldToMaturitySecuritiesDebtMaturitiesSingleMaturityDateFairValue_019fd25f-c567-7c87-8d95-0191aaabe019" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_HeldToMaturitySecuritiesDebtMaturitiesSingleMaturityDateFairValue"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_HeldToMaturitySecuritiesDebtMaturitiesWithinOneYearFairValue_019fd25f-c567-7ee0-9f5e-540441504c54" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_HeldToMaturitySecuritiesDebtMaturitiesWithinOneYearFairValue"/>
    <link:calculationArc order="1" weight="1.0" xlink:arcrole="https://xbrl.org/2023/arcrole/summation-item" xlink:from="loc_us-gaap_HeldToMaturitySecuritiesDebtMaturitiesSingleMaturityDateFairValue_019fd25f-c567-7c87-8d95-0191aaabe019" xlink:to="loc_us-gaap_HeldToMaturitySecuritiesDebtMaturitiesWithinOneYearFairValue_019fd25f-c567-7ee0-9f5e-540441504c54" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_HeldToMaturitySecuritiesDebtMaturitiesAfterOneThroughFiveYearsFairValue_019fd25f-c567-7bef-9922-07b83f5010f0" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_HeldToMaturitySecuritiesDebtMaturitiesAfterOneThroughFiveYearsFairValue"/>
    <link:calculationArc order="2" weight="1.0" xlink:arcrole="https://xbrl.org/2023/arcrole/summation-item" xlink:from="loc_us-gaap_HeldToMaturitySecuritiesDebtMaturitiesSingleMaturityDateFairValue_019fd25f-c567-7c87-8d95-0191aaabe019" xlink:to="loc_us-gaap_HeldToMaturitySecuritiesDebtMaturitiesAfterOneThroughFiveYearsFairValue_019fd25f-c567-7bef-9922-07b83f5010f0" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_HeldToMaturitySecuritiesDebtMaturitiesAfterFiveThroughTenYearsFairValue_019fd25f-c567-7d01-9a07-31e64ecdaf34" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_HeldToMaturitySecuritiesDebtMaturitiesAfterFiveThroughTenYearsFairValue"/>
    <link:calculationArc order="3" weight="1.0" xlink:arcrole="https://xbrl.org/2023/arcrole/summation-item" xlink:from="loc_us-gaap_HeldToMaturitySecuritiesDebtMaturitiesSingleMaturityDateFairValue_019fd25f-c567-7c87-8d95-0191aaabe019" xlink:to="loc_us-gaap_HeldToMaturitySecuritiesDebtMaturitiesAfterFiveThroughTenYearsFairValue_019fd25f-c567-7d01-9a07-31e64ecdaf34" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_HeldToMaturitySecuritiesDebtMaturitiesAfterTenYearsFairValue_019fd25f-c567-70b5-b60b-02ad64b50fff" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_HeldToMaturitySecuritiesDebtMaturitiesAfterTenYearsFairValue"/>
    <link:calculationArc order="4" weight="1.0" xlink:arcrole="https://xbrl.org/2023/arcrole/summation-item" xlink:from="loc_us-gaap_HeldToMaturitySecuritiesDebtMaturitiesSingleMaturityDateFairValue_019fd25f-c567-7c87-8d95-0191aaabe019" xlink:to="loc_us-gaap_HeldToMaturitySecuritiesDebtMaturitiesAfterTenYearsFairValue_019fd25f-c567-70b5-b60b-02ad64b50fff" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtSecuritiesAvailableForSaleExcludingAccruedInterest_019fd25f-c567-75d7-9a36-6b51bcd7ee0f" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_DebtSecuritiesAvailableForSaleExcludingAccruedInterest"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AvailableForSaleSecuritiesDebtMaturitiesSingleMaturityDate_019fd25f-c567-7f8b-bad2-51e80f9802a3" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_AvailableForSaleSecuritiesDebtMaturitiesSingleMaturityDate"/>
    <link:calculationArc order="1" weight="1.0" xlink:arcrole="https://xbrl.org/2023/arcrole/summation-item" xlink:from="loc_us-gaap_DebtSecuritiesAvailableForSaleExcludingAccruedInterest_019fd25f-c567-75d7-9a36-6b51bcd7ee0f" xlink:to="loc_us-gaap_AvailableForSaleSecuritiesDebtMaturitiesSingleMaturityDate_019fd25f-c567-7f8b-bad2-51e80f9802a3" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AvailableForSaleSecuritiesDebtMaturitiesWithoutSingleMaturityDateFairValue_019fd25f-c567-758d-80d0-c29d750b3ace" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_AvailableForSaleSecuritiesDebtMaturitiesWithoutSingleMaturityDateFairValue"/>
    <link:calculationArc order="2" weight="1.0" xlink:arcrole="https://xbrl.org/2023/arcrole/summation-item" xlink:from="loc_us-gaap_DebtSecuritiesAvailableForSaleExcludingAccruedInterest_019fd25f-c567-75d7-9a36-6b51bcd7ee0f" xlink:to="loc_us-gaap_AvailableForSaleSecuritiesDebtMaturitiesWithoutSingleMaturityDateFairValue_019fd25f-c567-758d-80d0-c29d750b3ace" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtSecuritiesHeldToMaturityAmortizedCostExcludingAccruedInterestAfterAllowanceForCreditLossMaturityAllocatedAndSingleMaturityDate_019fd25f-c567-7d03-a49e-abf2bc664070" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_DebtSecuritiesHeldToMaturityAmortizedCostExcludingAccruedInterestAfterAllowanceForCreditLossMaturityAllocatedAndSingleMaturityDate"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtSecuritiesHeldToMaturityAmortizedCostExcludingAccruedInterestAfterAllowanceForCreditLossMaturityAllocatedAndSingleMaturityDateAfterYearOneThroughFive_019fd25f-c567-705e-98b0-12f0e83fbd7f" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_DebtSecuritiesHeldToMaturityAmortizedCostExcludingAccruedInterestAfterAllowanceForCreditLossMaturityAllocatedAndSingleMaturityDateAfterYearOneThroughFive"/>
    <link:calculationArc order="1" weight="1.0" xlink:arcrole="https://xbrl.org/2023/arcrole/summation-item" xlink:from="loc_us-gaap_DebtSecuritiesHeldToMaturityAmortizedCostExcludingAccruedInterestAfterAllowanceForCreditLossMaturityAllocatedAndSingleMaturityDate_019fd25f-c567-7d03-a49e-abf2bc664070" xlink:to="loc_us-gaap_DebtSecuritiesHeldToMaturityAmortizedCostExcludingAccruedInterestAfterAllowanceForCreditLossMaturityAllocatedAndSingleMaturityDateAfterYearOneThroughFive_019fd25f-c567-705e-98b0-12f0e83fbd7f" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtSecuritiesHeldToMaturityAmortizedCostExcludingAccruedInterestAfterAllowanceForCreditLossMaturityAllocatedAndSingleMaturityDateYearOne_019fd25f-c567-76d9-bace-98a63fdc5322" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_DebtSecuritiesHeldToMaturityAmortizedCostExcludingAccruedInterestAfterAllowanceForCreditLossMaturityAllocatedAndSingleMaturityDateYearOne"/>
    <link:calculationArc order="2" weight="1.0" xlink:arcrole="https://xbrl.org/2023/arcrole/summation-item" xlink:from="loc_us-gaap_DebtSecuritiesHeldToMaturityAmortizedCostExcludingAccruedInterestAfterAllowanceForCreditLossMaturityAllocatedAndSingleMaturityDate_019fd25f-c567-7d03-a49e-abf2bc664070" xlink:to="loc_us-gaap_DebtSecuritiesHeldToMaturityAmortizedCostExcludingAccruedInterestAfterAllowanceForCreditLossMaturityAllocatedAndSingleMaturityDateYearOne_019fd25f-c567-76d9-bace-98a63fdc5322" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtSecuritiesHeldToMaturityAmortizedCostExcludingAccruedInterestAfterAllowanceForCreditLossMaturityAllocatedAndSingleMaturityDateAfterYear10_019fd25f-c567-71dd-833b-cde7262dc8eb" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_DebtSecuritiesHeldToMaturityAmortizedCostExcludingAccruedInterestAfterAllowanceForCreditLossMaturityAllocatedAndSingleMaturityDateAfterYear10"/>
    <link:calculationArc order="3" weight="1.0" xlink:arcrole="https://xbrl.org/2023/arcrole/summation-item" xlink:from="loc_us-gaap_DebtSecuritiesHeldToMaturityAmortizedCostExcludingAccruedInterestAfterAllowanceForCreditLossMaturityAllocatedAndSingleMaturityDate_019fd25f-c567-7d03-a49e-abf2bc664070" xlink:to="loc_us-gaap_DebtSecuritiesHeldToMaturityAmortizedCostExcludingAccruedInterestAfterAllowanceForCreditLossMaturityAllocatedAndSingleMaturityDateAfterYear10_019fd25f-c567-71dd-833b-cde7262dc8eb" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtSecuritiesHeldToMaturityAmortizedCostExcludingAccruedInterestAfterAllowanceForCreditLossMaturityAllocatedAndSingleMaturityDateAfterYear5Through10_019fd25f-c567-7cdd-ac9e-d2ce8f8a4a1d" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_DebtSecuritiesHeldToMaturityAmortizedCostExcludingAccruedInterestAfterAllowanceForCreditLossMaturityAllocatedAndSingleMaturityDateAfterYear5Through10"/>
    <link:calculationArc order="4" weight="1.0" xlink:arcrole="https://xbrl.org/2023/arcrole/summation-item" xlink:from="loc_us-gaap_DebtSecuritiesHeldToMaturityAmortizedCostExcludingAccruedInterestAfterAllowanceForCreditLossMaturityAllocatedAndSingleMaturityDate_019fd25f-c567-7d03-a49e-abf2bc664070" xlink:to="loc_us-gaap_DebtSecuritiesHeldToMaturityAmortizedCostExcludingAccruedInterestAfterAllowanceForCreditLossMaturityAllocatedAndSingleMaturityDateAfterYear5Through10_019fd25f-c567-7cdd-ac9e-d2ce8f8a4a1d" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AvailableForSaleSecuritiesDebtMaturitiesSingleMaturityDate_019fd25f-c567-7f01-a77b-52c5716fa2c3" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_AvailableForSaleSecuritiesDebtMaturitiesSingleMaturityDate"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AvailableForSaleSecuritiesDebtMaturitiesWithinOneYearFairValue_019fd25f-c567-7bbe-ac30-9e506dbc3bfc" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_AvailableForSaleSecuritiesDebtMaturitiesWithinOneYearFairValue"/>
    <link:calculationArc order="1" weight="1.0" xlink:arcrole="https://xbrl.org/2023/arcrole/summation-item" xlink:from="loc_us-gaap_AvailableForSaleSecuritiesDebtMaturitiesSingleMaturityDate_019fd25f-c567-7f01-a77b-52c5716fa2c3" xlink:to="loc_us-gaap_AvailableForSaleSecuritiesDebtMaturitiesWithinOneYearFairValue_019fd25f-c567-7bbe-ac30-9e506dbc3bfc" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AvailableForSaleSecuritiesDebtMaturitiesAfterOneThroughFiveYearsFairValue_019fd25f-c567-7f7c-bb4b-d366fcf0c7c0" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_AvailableForSaleSecuritiesDebtMaturitiesAfterOneThroughFiveYearsFairValue"/>
    <link:calculationArc order="2" weight="1.0" xlink:arcrole="https://xbrl.org/2023/arcrole/summation-item" xlink:from="loc_us-gaap_AvailableForSaleSecuritiesDebtMaturitiesSingleMaturityDate_019fd25f-c567-7f01-a77b-52c5716fa2c3" xlink:to="loc_us-gaap_AvailableForSaleSecuritiesDebtMaturitiesAfterOneThroughFiveYearsFairValue_019fd25f-c567-7f7c-bb4b-d366fcf0c7c0" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AvailableForSaleSecuritiesDebtMaturitiesAfterFiveThroughTenYearsFairValue_019fd25f-c567-7949-9ee9-763bb26e387b" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_AvailableForSaleSecuritiesDebtMaturitiesAfterFiveThroughTenYearsFairValue"/>
    <link:calculationArc order="3" weight="1.0" xlink:arcrole="https://xbrl.org/2023/arcrole/summation-item" xlink:from="loc_us-gaap_AvailableForSaleSecuritiesDebtMaturitiesSingleMaturityDate_019fd25f-c567-7f01-a77b-52c5716fa2c3" xlink:to="loc_us-gaap_AvailableForSaleSecuritiesDebtMaturitiesAfterFiveThroughTenYearsFairValue_019fd25f-c567-7949-9ee9-763bb26e387b" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AvailableForSaleSecuritiesDebtMaturitiesAfterTenYearsFairValue_019fd25f-c567-763f-bdd4-9b44a784e826" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_AvailableForSaleSecuritiesDebtMaturitiesAfterTenYearsFairValue"/>
    <link:calculationArc order="4" weight="1.0" xlink:arcrole="https://xbrl.org/2023/arcrole/summation-item" xlink:from="loc_us-gaap_AvailableForSaleSecuritiesDebtMaturitiesSingleMaturityDate_019fd25f-c567-7f01-a77b-52c5716fa2c3" xlink:to="loc_us-gaap_AvailableForSaleSecuritiesDebtMaturitiesAfterTenYearsFairValue_019fd25f-c567-763f-bdd4-9b44a784e826" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AvailableForSaleSecuritiesDebtMaturitiesSingleMaturityDateAmortizedCostBasis_019fd25f-c567-7e8b-a386-2bd65a1295cc" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_AvailableForSaleSecuritiesDebtMaturitiesSingleMaturityDateAmortizedCostBasis"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AvailableForSaleSecuritiesDebtMaturitiesWithinOneYearAmortizedCost_019fd25f-c567-7427-9b19-53d905056606" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_AvailableForSaleSecuritiesDebtMaturitiesWithinOneYearAmortizedCost"/>
    <link:calculationArc order="1" weight="1.0" xlink:arcrole="https://xbrl.org/2023/arcrole/summation-item" xlink:from="loc_us-gaap_AvailableForSaleSecuritiesDebtMaturitiesSingleMaturityDateAmortizedCostBasis_019fd25f-c567-7e8b-a386-2bd65a1295cc" xlink:to="loc_us-gaap_AvailableForSaleSecuritiesDebtMaturitiesWithinOneYearAmortizedCost_019fd25f-c567-7427-9b19-53d905056606" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AvailableForSaleSecuritiesDebtMaturitiesAfterOneThroughFiveYearsAmortizedCost_019fd25f-c567-7ec8-a678-22880359a5b7" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_AvailableForSaleSecuritiesDebtMaturitiesAfterOneThroughFiveYearsAmortizedCost"/>
    <link:calculationArc order="2" weight="1.0" xlink:arcrole="https://xbrl.org/2023/arcrole/summation-item" xlink:from="loc_us-gaap_AvailableForSaleSecuritiesDebtMaturitiesSingleMaturityDateAmortizedCostBasis_019fd25f-c567-7e8b-a386-2bd65a1295cc" xlink:to="loc_us-gaap_AvailableForSaleSecuritiesDebtMaturitiesAfterOneThroughFiveYearsAmortizedCost_019fd25f-c567-7ec8-a678-22880359a5b7" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AvailableForSaleSecuritiesDebtMaturitiesAfterFiveThroughTenYearsAmortizedCost_019fd25f-c567-7290-97eb-dd0eb26601a7" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_AvailableForSaleSecuritiesDebtMaturitiesAfterFiveThroughTenYearsAmortizedCost"/>
    <link:calculationArc order="3" weight="1.0" xlink:arcrole="https://xbrl.org/2023/arcrole/summation-item" xlink:from="loc_us-gaap_AvailableForSaleSecuritiesDebtMaturitiesSingleMaturityDateAmortizedCostBasis_019fd25f-c567-7e8b-a386-2bd65a1295cc" xlink:to="loc_us-gaap_AvailableForSaleSecuritiesDebtMaturitiesAfterFiveThroughTenYearsAmortizedCost_019fd25f-c567-7290-97eb-dd0eb26601a7" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AvailableForSaleSecuritiesDebtMaturitiesRollingAfterYearTenAmortizedCostBasis_019fd25f-c567-7656-8ab8-9c242da46006" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_AvailableForSaleSecuritiesDebtMaturitiesRollingAfterYearTenAmortizedCostBasis"/>
    <link:calculationArc order="4" weight="1.0" xlink:arcrole="https://xbrl.org/2023/arcrole/summation-item" xlink:from="loc_us-gaap_AvailableForSaleSecuritiesDebtMaturitiesSingleMaturityDateAmortizedCostBasis_019fd25f-c567-7e8b-a386-2bd65a1295cc" xlink:to="loc_us-gaap_AvailableForSaleSecuritiesDebtMaturitiesRollingAfterYearTenAmortizedCostBasis_019fd25f-c567-7656-8ab8-9c242da46006" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtSecuritiesAvailableForSaleAmortizedCostExcludingAccruedInterestAfterAllowanceForCreditLoss_019fd25f-c567-7924-8556-2bbe922bde4a" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_DebtSecuritiesAvailableForSaleAmortizedCostExcludingAccruedInterestAfterAllowanceForCreditLoss"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AvailableForSaleSecuritiesDebtMaturitiesSingleMaturityDateAmortizedCostBasis_019fd25f-c567-700f-a6ba-654ab19eb75c" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_AvailableForSaleSecuritiesDebtMaturitiesSingleMaturityDateAmortizedCostBasis"/>
    <link:calculationArc order="1" weight="1.0" xlink:arcrole="https://xbrl.org/2023/arcrole/summation-item" xlink:from="loc_us-gaap_DebtSecuritiesAvailableForSaleAmortizedCostExcludingAccruedInterestAfterAllowanceForCreditLoss_019fd25f-c567-7924-8556-2bbe922bde4a" xlink:to="loc_us-gaap_AvailableForSaleSecuritiesDebtMaturitiesSingleMaturityDateAmortizedCostBasis_019fd25f-c567-700f-a6ba-654ab19eb75c" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AvailableForSaleSecuritiesDebtMaturitiesWithoutSingleMaturityDateAmortizedCost_019fd25f-c567-7843-a936-8f712295e9b9" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_AvailableForSaleSecuritiesDebtMaturitiesWithoutSingleMaturityDateAmortizedCost"/>
    <link:calculationArc order="2" weight="1.0" xlink:arcrole="https://xbrl.org/2023/arcrole/summation-item" xlink:from="loc_us-gaap_DebtSecuritiesAvailableForSaleAmortizedCostExcludingAccruedInterestAfterAllowanceForCreditLoss_019fd25f-c567-7924-8556-2bbe922bde4a" xlink:to="loc_us-gaap_AvailableForSaleSecuritiesDebtMaturitiesWithoutSingleMaturityDateAmortizedCost_019fd25f-c567-7843-a936-8f712295e9b9" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_HeldToMaturitySecuritiesFairValue_019fd25f-c567-73b7-bb80-6ddfccac23a3" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_HeldToMaturitySecuritiesFairValue"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_HeldToMaturitySecuritiesDebtMaturitiesWithoutSingleMaturityDateFairValue_019fd25f-c567-76a7-ae05-71b28e8621b1" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_HeldToMaturitySecuritiesDebtMaturitiesWithoutSingleMaturityDateFairValue"/>
    <link:calculationArc order="1" weight="1.0" xlink:arcrole="https://xbrl.org/2023/arcrole/summation-item" xlink:from="loc_us-gaap_HeldToMaturitySecuritiesFairValue_019fd25f-c567-73b7-bb80-6ddfccac23a3" xlink:to="loc_us-gaap_HeldToMaturitySecuritiesDebtMaturitiesWithoutSingleMaturityDateFairValue_019fd25f-c567-76a7-ae05-71b28e8621b1" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_HeldToMaturitySecuritiesDebtMaturitiesSingleMaturityDateFairValue_019fd25f-c567-78d8-a33f-af9cfd440be6" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_HeldToMaturitySecuritiesDebtMaturitiesSingleMaturityDateFairValue"/>
    <link:calculationArc order="2" weight="1.0" xlink:arcrole="https://xbrl.org/2023/arcrole/summation-item" xlink:from="loc_us-gaap_HeldToMaturitySecuritiesFairValue_019fd25f-c567-73b7-bb80-6ddfccac23a3" xlink:to="loc_us-gaap_HeldToMaturitySecuritiesDebtMaturitiesSingleMaturityDateFairValue_019fd25f-c567-78d8-a33f-af9cfd440be6" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtSecuritiesHeldToMaturityExcludingAccruedInterestAfterAllowanceForCreditLoss_019fd25f-c567-7c9a-ac56-0bd96fb24a5d" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_DebtSecuritiesHeldToMaturityExcludingAccruedInterestAfterAllowanceForCreditLoss"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtSecuritiesHeldToMaturityAmortizedCostExcludingAccruedInterestAfterAllowanceForCreditLossMaturityWithoutSingleMaturityDate_019fd25f-c567-7f7d-aca6-927fd0ccd189" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_DebtSecuritiesHeldToMaturityAmortizedCostExcludingAccruedInterestAfterAllowanceForCreditLossMaturityWithoutSingleMaturityDate"/>
    <link:calculationArc order="1" weight="1.0" xlink:arcrole="https://xbrl.org/2023/arcrole/summation-item" xlink:from="loc_us-gaap_DebtSecuritiesHeldToMaturityExcludingAccruedInterestAfterAllowanceForCreditLoss_019fd25f-c567-7c9a-ac56-0bd96fb24a5d" xlink:to="loc_us-gaap_DebtSecuritiesHeldToMaturityAmortizedCostExcludingAccruedInterestAfterAllowanceForCreditLossMaturityWithoutSingleMaturityDate_019fd25f-c567-7f7d-aca6-927fd0ccd189" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtSecuritiesHeldToMaturityAmortizedCostExcludingAccruedInterestAfterAllowanceForCreditLossMaturityAllocatedAndSingleMaturityDate_019fd25f-c567-7243-9461-728c89966bc3" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_DebtSecuritiesHeldToMaturityAmortizedCostExcludingAccruedInterestAfterAllowanceForCreditLossMaturityAllocatedAndSingleMaturityDate"/>
    <link:calculationArc order="2" weight="1.0" xlink:arcrole="https://xbrl.org/2023/arcrole/summation-item" xlink:from="loc_us-gaap_DebtSecuritiesHeldToMaturityExcludingAccruedInterestAfterAllowanceForCreditLoss_019fd25f-c567-7c9a-ac56-0bd96fb24a5d" xlink:to="loc_us-gaap_DebtSecuritiesHeldToMaturityAmortizedCostExcludingAccruedInterestAfterAllowanceForCreditLossMaturityAllocatedAndSingleMaturityDate_019fd25f-c567-7243-9461-728c89966bc3" xlink:type="arc"/>
  </link:calculationLink>
  <link:roleRef roleURI="http://www.seacoastbanking.com/role/SecuritiesScheduleofUnrealizedLossandFairValueonInvestmentsDetails" xlink:type="simple" xlink:href="sbcf-20260930.xsd#SecuritiesScheduleofUnrealizedLossandFairValueonInvestmentsDetails"/>
  <link:calculationLink xlink:role="http://www.seacoastbanking.com/role/SecuritiesScheduleofUnrealizedLossandFairValueonInvestmentsDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtSecuritiesAvailableForSaleUnrealizedLossPositionAccumulatedLoss_019fd25f-c567-7e8c-8cee-5aaab01fc770" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_DebtSecuritiesAvailableForSaleUnrealizedLossPositionAccumulatedLoss"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtSecuritiesAvailableForSaleContinuousUnrealizedLossPositionLessThan12MonthsAccumulatedLoss_019fd25f-c567-78b6-837c-75f27667fe3a" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_DebtSecuritiesAvailableForSaleContinuousUnrealizedLossPositionLessThan12MonthsAccumulatedLoss"/>
    <link:calculationArc order="1" weight="1.0" xlink:arcrole="https://xbrl.org/2023/arcrole/summation-item" xlink:from="loc_us-gaap_DebtSecuritiesAvailableForSaleUnrealizedLossPositionAccumulatedLoss_019fd25f-c567-7e8c-8cee-5aaab01fc770" xlink:to="loc_us-gaap_DebtSecuritiesAvailableForSaleContinuousUnrealizedLossPositionLessThan12MonthsAccumulatedLoss_019fd25f-c567-78b6-837c-75f27667fe3a" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtSecuritiesAvailableForSaleContinuousUnrealizedLossPosition12MonthsOrLongerAccumulatedLoss_019fd25f-c567-7ab5-890f-ecc295355dc5" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_DebtSecuritiesAvailableForSaleContinuousUnrealizedLossPosition12MonthsOrLongerAccumulatedLoss"/>
    <link:calculationArc order="2" weight="1.0" xlink:arcrole="https://xbrl.org/2023/arcrole/summation-item" xlink:from="loc_us-gaap_DebtSecuritiesAvailableForSaleUnrealizedLossPositionAccumulatedLoss_019fd25f-c567-7e8c-8cee-5aaab01fc770" xlink:to="loc_us-gaap_DebtSecuritiesAvailableForSaleContinuousUnrealizedLossPosition12MonthsOrLongerAccumulatedLoss_019fd25f-c567-7ab5-890f-ecc295355dc5" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtSecuritiesAvailableForSaleUnrealizedLossPosition_019fd25f-c567-7b32-9928-8a7dce064694" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_DebtSecuritiesAvailableForSaleUnrealizedLossPosition"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtSecuritiesAvailableForSaleContinuousUnrealizedLossPositionLessThan12Months_019fd25f-c567-7574-ad80-e4fc02d4fb74" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_DebtSecuritiesAvailableForSaleContinuousUnrealizedLossPositionLessThan12Months"/>
    <link:calculationArc order="1" weight="1.0" xlink:arcrole="https://xbrl.org/2023/arcrole/summation-item" xlink:from="loc_us-gaap_DebtSecuritiesAvailableForSaleUnrealizedLossPosition_019fd25f-c567-7b32-9928-8a7dce064694" xlink:to="loc_us-gaap_DebtSecuritiesAvailableForSaleContinuousUnrealizedLossPositionLessThan12Months_019fd25f-c567-7574-ad80-e4fc02d4fb74" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtSecuritiesAvailableForSaleContinuousUnrealizedLossPosition12MonthsOrLonger_019fd25f-c567-741b-abaa-0a79c9ee6d47" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_DebtSecuritiesAvailableForSaleContinuousUnrealizedLossPosition12MonthsOrLonger"/>
    <link:calculationArc order="2" weight="1.0" xlink:arcrole="https://xbrl.org/2023/arcrole/summation-item" xlink:from="loc_us-gaap_DebtSecuritiesAvailableForSaleUnrealizedLossPosition_019fd25f-c567-7b32-9928-8a7dce064694" xlink:to="loc_us-gaap_DebtSecuritiesAvailableForSaleContinuousUnrealizedLossPosition12MonthsOrLonger_019fd25f-c567-741b-abaa-0a79c9ee6d47" xlink:type="arc"/>
  </link:calculationLink>
  <link:roleRef roleURI="http://www.seacoastbanking.com/role/LoansScheduleofNonaccrualLoansbyLoanCategoryDetails" xlink:type="simple" xlink:href="sbcf-20260930.xsd#LoansScheduleofNonaccrualLoansbyLoanCategoryDetails"/>
  <link:calculationLink xlink:role="http://www.seacoastbanking.com/role/LoansScheduleofNonaccrualLoansbyLoanCategoryDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FinancingReceivableExcludingAccruedInterestNonaccrual_019fd25f-c567-7a4e-9f8d-aa21b853fa69" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_FinancingReceivableExcludingAccruedInterestNonaccrual"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FinancingReceivableExcludingAccruedInterestNonaccrualNoAllowance_019fd25f-c567-7d7b-a133-677eecd5e5da" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_FinancingReceivableExcludingAccruedInterestNonaccrualNoAllowance"/>
    <link:calculationArc order="1" weight="1.0" xlink:arcrole="https://xbrl.org/2023/arcrole/summation-item" xlink:from="loc_us-gaap_FinancingReceivableExcludingAccruedInterestNonaccrual_019fd25f-c567-7a4e-9f8d-aa21b853fa69" xlink:to="loc_us-gaap_FinancingReceivableExcludingAccruedInterestNonaccrualNoAllowance_019fd25f-c567-7d7b-a133-677eecd5e5da" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_sbcf_FinancingReceivableExcludingAccruedInterestNonaccrualWithAllowanceForCreditLosses_019fd25f-c567-76f9-aab9-83c9a9f5e445" xlink:href="sbcf-20260930.xsd#sbcf_FinancingReceivableExcludingAccruedInterestNonaccrualWithAllowanceForCreditLosses"/>
    <link:calculationArc order="2" weight="1.0" xlink:arcrole="https://xbrl.org/2023/arcrole/summation-item" xlink:from="loc_us-gaap_FinancingReceivableExcludingAccruedInterestNonaccrual_019fd25f-c567-7a4e-9f8d-aa21b853fa69" xlink:to="loc_sbcf_FinancingReceivableExcludingAccruedInterestNonaccrualWithAllowanceForCreditLosses_019fd25f-c567-76f9-aab9-83c9a9f5e445" xlink:type="arc"/>
  </link:calculationLink>
  <link:roleRef roleURI="http://www.seacoastbanking.com/role/LoansScheduleofRiskCategoriesofLoansbyClassofLoansDetails" xlink:type="simple" xlink:href="sbcf-20260930.xsd#LoansScheduleofRiskCategoriesofLoansbyClassofLoansDetails"/>
  <link:calculationLink xlink:role="http://www.seacoastbanking.com/role/LoansScheduleofRiskCategoriesofLoansbyClassofLoansDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FinancingReceivableExcludingAccruedInterestAllowanceForCreditLossWriteoff_019fd25f-c567-7285-b041-60e846aaa31c" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_FinancingReceivableExcludingAccruedInterestAllowanceForCreditLossWriteoff"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FinancingReceivableExcludingAccruedInterestYearOneOriginatedCurrentFiscalYearWriteoff_019fd25f-c567-7c54-83b9-369c379fdc1f" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_FinancingReceivableExcludingAccruedInterestYearOneOriginatedCurrentFiscalYearWriteoff"/>
    <link:calculationArc order="1" weight="1.0" xlink:arcrole="https://xbrl.org/2023/arcrole/summation-item" xlink:from="loc_us-gaap_FinancingReceivableExcludingAccruedInterestAllowanceForCreditLossWriteoff_019fd25f-c567-7285-b041-60e846aaa31c" xlink:to="loc_us-gaap_FinancingReceivableExcludingAccruedInterestYearOneOriginatedCurrentFiscalYearWriteoff_019fd25f-c567-7c54-83b9-369c379fdc1f" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FinancingReceivableExcludingAccruedInterestYearTwoOriginatedFiscalYearBeforeCurrentFiscalYearWriteoff_019fd25f-c567-7307-a0d8-e39d9526ecea" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_FinancingReceivableExcludingAccruedInterestYearTwoOriginatedFiscalYearBeforeCurrentFiscalYearWriteoff"/>
    <link:calculationArc order="2" weight="1.0" xlink:arcrole="https://xbrl.org/2023/arcrole/summation-item" xlink:from="loc_us-gaap_FinancingReceivableExcludingAccruedInterestAllowanceForCreditLossWriteoff_019fd25f-c567-7285-b041-60e846aaa31c" xlink:to="loc_us-gaap_FinancingReceivableExcludingAccruedInterestYearTwoOriginatedFiscalYearBeforeCurrentFiscalYearWriteoff_019fd25f-c567-7307-a0d8-e39d9526ecea" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FinancingReceivableExcludingAccruedInterestYearThreeOriginatedTwoYearsBeforeCurrentFiscalYearWriteoff_019fd25f-c567-7f87-b1df-db56e0d04b15" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_FinancingReceivableExcludingAccruedInterestYearThreeOriginatedTwoYearsBeforeCurrentFiscalYearWriteoff"/>
    <link:calculationArc order="3" weight="1.0" xlink:arcrole="https://xbrl.org/2023/arcrole/summation-item" xlink:from="loc_us-gaap_FinancingReceivableExcludingAccruedInterestAllowanceForCreditLossWriteoff_019fd25f-c567-7285-b041-60e846aaa31c" xlink:to="loc_us-gaap_FinancingReceivableExcludingAccruedInterestYearThreeOriginatedTwoYearsBeforeCurrentFiscalYearWriteoff_019fd25f-c567-7f87-b1df-db56e0d04b15" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FinancingReceivableExcludingAccruedInterestYearFourOriginatedThreeYearsBeforeCurrentFiscalYearWriteoff_019fd25f-c567-73f7-80c8-708b5a34bace" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_FinancingReceivableExcludingAccruedInterestYearFourOriginatedThreeYearsBeforeCurrentFiscalYearWriteoff"/>
    <link:calculationArc order="4" weight="1.0" xlink:arcrole="https://xbrl.org/2023/arcrole/summation-item" xlink:from="loc_us-gaap_FinancingReceivableExcludingAccruedInterestAllowanceForCreditLossWriteoff_019fd25f-c567-7285-b041-60e846aaa31c" xlink:to="loc_us-gaap_FinancingReceivableExcludingAccruedInterestYearFourOriginatedThreeYearsBeforeCurrentFiscalYearWriteoff_019fd25f-c567-73f7-80c8-708b5a34bace" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FinancingReceivableExcludingAccruedInterestYearFiveOriginatedFourYearsBeforeCurrentFiscalYearWriteoff_019fd25f-c567-7531-9e07-08ac1753651c" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_FinancingReceivableExcludingAccruedInterestYearFiveOriginatedFourYearsBeforeCurrentFiscalYearWriteoff"/>
    <link:calculationArc order="5" weight="1.0" xlink:arcrole="https://xbrl.org/2023/arcrole/summation-item" xlink:from="loc_us-gaap_FinancingReceivableExcludingAccruedInterestAllowanceForCreditLossWriteoff_019fd25f-c567-7285-b041-60e846aaa31c" xlink:to="loc_us-gaap_FinancingReceivableExcludingAccruedInterestYearFiveOriginatedFourYearsBeforeCurrentFiscalYearWriteoff_019fd25f-c567-7531-9e07-08ac1753651c" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FinancingReceivableExcludingAccruedInterestOriginatedMoreThanFiveYearsBeforeCurrentFiscalYearWriteoff_019fd25f-c567-73e4-93b0-e7ddc46a3794" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_FinancingReceivableExcludingAccruedInterestOriginatedMoreThanFiveYearsBeforeCurrentFiscalYearWriteoff"/>
    <link:calculationArc order="6" weight="1.0" xlink:arcrole="https://xbrl.org/2023/arcrole/summation-item" xlink:from="loc_us-gaap_FinancingReceivableExcludingAccruedInterestAllowanceForCreditLossWriteoff_019fd25f-c567-7285-b041-60e846aaa31c" xlink:to="loc_us-gaap_FinancingReceivableExcludingAccruedInterestOriginatedMoreThanFiveYearsBeforeCurrentFiscalYearWriteoff_019fd25f-c567-73e4-93b0-e7ddc46a3794" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FinancingReceivableExcludingAccruedInterestRevolvingWriteoff_019fd25f-c567-7324-a1b2-91db4b6ec18a" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_FinancingReceivableExcludingAccruedInterestRevolvingWriteoff"/>
    <link:calculationArc order="7" weight="1.0" xlink:arcrole="https://xbrl.org/2023/arcrole/summation-item" xlink:from="loc_us-gaap_FinancingReceivableExcludingAccruedInterestAllowanceForCreditLossWriteoff_019fd25f-c567-7285-b041-60e846aaa31c" xlink:to="loc_us-gaap_FinancingReceivableExcludingAccruedInterestRevolvingWriteoff_019fd25f-c567-7324-a1b2-91db4b6ec18a" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FinancingReceivableExcludingAccruedInterestRevolvingConvertedToTermLoanWriteoff_019fd25f-c567-7355-b225-f7f17a397620" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_FinancingReceivableExcludingAccruedInterestRevolvingConvertedToTermLoanWriteoff"/>
    <link:calculationArc order="8" weight="1.0" xlink:arcrole="https://xbrl.org/2023/arcrole/summation-item" xlink:from="loc_us-gaap_FinancingReceivableExcludingAccruedInterestAllowanceForCreditLossWriteoff_019fd25f-c567-7285-b041-60e846aaa31c" xlink:to="loc_us-gaap_FinancingReceivableExcludingAccruedInterestRevolvingConvertedToTermLoanWriteoff_019fd25f-c567-7355-b225-f7f17a397620" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FinancingReceivableExcludingAccruedInterestBeforeAllowanceForCreditLoss_019fd25f-c567-7e11-a018-817db9369190" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_FinancingReceivableExcludingAccruedInterestBeforeAllowanceForCreditLoss"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FinancingReceivableExcludingAccruedInterestYearTwoOriginatedFiscalYearBeforeCurrentFiscalYear_019fd25f-c567-7825-83e3-ed33888f12a7" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_FinancingReceivableExcludingAccruedInterestYearTwoOriginatedFiscalYearBeforeCurrentFiscalYear"/>
    <link:calculationArc order="1" weight="1.0" xlink:arcrole="https://xbrl.org/2023/arcrole/summation-item" xlink:from="loc_us-gaap_FinancingReceivableExcludingAccruedInterestBeforeAllowanceForCreditLoss_019fd25f-c567-7e11-a018-817db9369190" xlink:to="loc_us-gaap_FinancingReceivableExcludingAccruedInterestYearTwoOriginatedFiscalYearBeforeCurrentFiscalYear_019fd25f-c567-7825-83e3-ed33888f12a7" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FinancingReceivableExcludingAccruedInterestYearOneOriginatedCurrentFiscalYear_019fd25f-c567-7e4f-9f11-08965216b938" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_FinancingReceivableExcludingAccruedInterestYearOneOriginatedCurrentFiscalYear"/>
    <link:calculationArc order="2" weight="1.0" xlink:arcrole="https://xbrl.org/2023/arcrole/summation-item" xlink:from="loc_us-gaap_FinancingReceivableExcludingAccruedInterestBeforeAllowanceForCreditLoss_019fd25f-c567-7e11-a018-817db9369190" xlink:to="loc_us-gaap_FinancingReceivableExcludingAccruedInterestYearOneOriginatedCurrentFiscalYear_019fd25f-c567-7e4f-9f11-08965216b938" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FinancingReceivableExcludingAccruedInterestYearThreeOriginatedTwoYearsBeforeCurrentFiscalYear_019fd25f-c567-7a0a-a0c8-4e38599fc569" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_FinancingReceivableExcludingAccruedInterestYearThreeOriginatedTwoYearsBeforeCurrentFiscalYear"/>
    <link:calculationArc order="3" weight="1.0" xlink:arcrole="https://xbrl.org/2023/arcrole/summation-item" xlink:from="loc_us-gaap_FinancingReceivableExcludingAccruedInterestBeforeAllowanceForCreditLoss_019fd25f-c567-7e11-a018-817db9369190" xlink:to="loc_us-gaap_FinancingReceivableExcludingAccruedInterestYearThreeOriginatedTwoYearsBeforeCurrentFiscalYear_019fd25f-c567-7a0a-a0c8-4e38599fc569" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FinancingReceivableExcludingAccruedInterestYearFiveOriginatedFourYearsBeforeCurrentFiscalYear_019fd25f-c567-7186-8c19-ee82958bbb24" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_FinancingReceivableExcludingAccruedInterestYearFiveOriginatedFourYearsBeforeCurrentFiscalYear"/>
    <link:calculationArc order="4" weight="1.0" xlink:arcrole="https://xbrl.org/2023/arcrole/summation-item" xlink:from="loc_us-gaap_FinancingReceivableExcludingAccruedInterestBeforeAllowanceForCreditLoss_019fd25f-c567-7e11-a018-817db9369190" xlink:to="loc_us-gaap_FinancingReceivableExcludingAccruedInterestYearFiveOriginatedFourYearsBeforeCurrentFiscalYear_019fd25f-c567-7186-8c19-ee82958bbb24" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FinancingReceivableExcludingAccruedInterestOriginatedMoreThanFiveYearsBeforeCurrentFiscalYear_019fd25f-c567-74e5-987d-70a9e7c6978c" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_FinancingReceivableExcludingAccruedInterestOriginatedMoreThanFiveYearsBeforeCurrentFiscalYear"/>
    <link:calculationArc order="5" weight="1.0" xlink:arcrole="https://xbrl.org/2023/arcrole/summation-item" xlink:from="loc_us-gaap_FinancingReceivableExcludingAccruedInterestBeforeAllowanceForCreditLoss_019fd25f-c567-7e11-a018-817db9369190" xlink:to="loc_us-gaap_FinancingReceivableExcludingAccruedInterestOriginatedMoreThanFiveYearsBeforeCurrentFiscalYear_019fd25f-c567-74e5-987d-70a9e7c6978c" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FinancingReceivableExcludingAccruedInterestRevolving_019fd25f-c567-74a7-959b-a186a58d9578" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_FinancingReceivableExcludingAccruedInterestRevolving"/>
    <link:calculationArc order="6" weight="1.0" xlink:arcrole="https://xbrl.org/2023/arcrole/summation-item" xlink:from="loc_us-gaap_FinancingReceivableExcludingAccruedInterestBeforeAllowanceForCreditLoss_019fd25f-c567-7e11-a018-817db9369190" xlink:to="loc_us-gaap_FinancingReceivableExcludingAccruedInterestRevolving_019fd25f-c567-74a7-959b-a186a58d9578" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FinancingReceivableExcludingAccruedInterestYearFourOriginatedThreeYearsBeforeCurrentFiscalYear_019fd25f-c567-77a3-8c2f-5d95b85c0aae" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_FinancingReceivableExcludingAccruedInterestYearFourOriginatedThreeYearsBeforeCurrentFiscalYear"/>
    <link:calculationArc order="7" weight="1.0" xlink:arcrole="https://xbrl.org/2023/arcrole/summation-item" xlink:from="loc_us-gaap_FinancingReceivableExcludingAccruedInterestBeforeAllowanceForCreditLoss_019fd25f-c567-7e11-a018-817db9369190" xlink:to="loc_us-gaap_FinancingReceivableExcludingAccruedInterestYearFourOriginatedThreeYearsBeforeCurrentFiscalYear_019fd25f-c567-77a3-8c2f-5d95b85c0aae" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FinancingReceivableExcludingAccruedInterestRevolvingConvertedToTermLoan_019fd25f-c567-7f75-8feb-659cffead3ac" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_FinancingReceivableExcludingAccruedInterestRevolvingConvertedToTermLoan"/>
    <link:calculationArc order="8" weight="1.0" xlink:arcrole="https://xbrl.org/2023/arcrole/summation-item" xlink:from="loc_us-gaap_FinancingReceivableExcludingAccruedInterestBeforeAllowanceForCreditLoss_019fd25f-c567-7e11-a018-817db9369190" xlink:to="loc_us-gaap_FinancingReceivableExcludingAccruedInterestRevolvingConvertedToTermLoan_019fd25f-c567-7f75-8feb-659cffead3ac" xlink:type="arc"/>
  </link:calculationLink>
  <link:roleRef roleURI="http://www.seacoastbanking.com/role/BusinessCombinationsScheduleofPurchasePriceDetails" xlink:type="simple" xlink:href="sbcf-20260930.xsd#BusinessCombinationsScheduleofPurchasePriceDetails"/>
  <link:calculationLink xlink:role="http://www.seacoastbanking.com/role/BusinessCombinationsScheduleofPurchasePriceDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_BusinessCombinationConsiderationTransferred1_019fd25f-c60d-7eff-8c9f-beea7f3b27a7" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_BusinessCombinationConsiderationTransferred1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_BusinessCombinationConsiderationTransferredEquityInterestsIssuedAndIssuable_019fd25f-c60d-7716-8dd7-518f0c9e467e" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_BusinessCombinationConsiderationTransferredEquityInterestsIssuedAndIssuable"/>
    <link:calculationArc order="1" weight="1.0" xlink:arcrole="https://xbrl.org/2023/arcrole/summation-item" xlink:from="loc_us-gaap_BusinessCombinationConsiderationTransferred1_019fd25f-c60d-7eff-8c9f-beea7f3b27a7" xlink:to="loc_us-gaap_BusinessCombinationConsiderationTransferredEquityInterestsIssuedAndIssuable_019fd25f-c60d-7716-8dd7-518f0c9e467e" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PaymentsToAcquireBusinessesGross_019fd25f-c60d-7eaa-addf-5218d99ed266" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_PaymentsToAcquireBusinessesGross"/>
    <link:calculationArc order="2" weight="1.0" xlink:arcrole="https://xbrl.org/2023/arcrole/summation-item" xlink:from="loc_us-gaap_BusinessCombinationConsiderationTransferred1_019fd25f-c60d-7eff-8c9f-beea7f3b27a7" xlink:to="loc_us-gaap_PaymentsToAcquireBusinessesGross_019fd25f-c60d-7eaa-addf-5218d99ed266" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_sbcf_PaymentsToAcquireBusinessesOptionHolders_019fd25f-c60d-7bea-a27f-636e20951eee" xlink:href="sbcf-20260930.xsd#sbcf_PaymentsToAcquireBusinessesOptionHolders"/>
    <link:calculationArc order="3" weight="1.0" xlink:arcrole="https://xbrl.org/2023/arcrole/summation-item" xlink:from="loc_us-gaap_BusinessCombinationConsiderationTransferred1_019fd25f-c60d-7eff-8c9f-beea7f3b27a7" xlink:to="loc_sbcf_PaymentsToAcquireBusinessesOptionHolders_019fd25f-c60d-7bea-a27f-636e20951eee" xlink:type="arc"/>
  </link:calculationLink>
  <link:roleRef roleURI="http://www.seacoastbanking.com/role/BusinessCombinationsScheduleofFairValueofAssetsAcquiredandLiabilitiesAssumedDetails" xlink:type="simple" xlink:href="sbcf-20260930.xsd#BusinessCombinationsScheduleofFairValueofAssetsAcquiredandLiabilitiesAssumedDetails"/>
  <link:calculationLink xlink:role="http://www.seacoastbanking.com/role/BusinessCombinationsScheduleofFairValueofAssetsAcquiredandLiabilitiesAssumedDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedLiabilities_019fd25f-c60d-7861-999b-2ba02e9471c0" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedLiabilities"/>
    <link:loc xlink:type="locator" xlink:label="loc_sbcf_BusinessCombinationRecognizedLiabilityAssumedDeposits_019fd25f-c60d-762c-9c95-f950aacab0e4" xlink:href="sbcf-20260930.xsd#sbcf_BusinessCombinationRecognizedLiabilityAssumedDeposits"/>
    <link:calculationArc order="1" weight="1.0" xlink:arcrole="https://xbrl.org/2023/arcrole/summation-item" xlink:from="loc_us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedLiabilities_019fd25f-c60d-7861-999b-2ba02e9471c0" xlink:to="loc_sbcf_BusinessCombinationRecognizedLiabilityAssumedDeposits_019fd25f-c60d-762c-9c95-f950aacab0e4" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_sbcf_BusinessCombinationRecognizedLiabilityAssumedSecuritiesSoldUnderAgreementsToRepurchase_019fd25f-c60d-7616-bf14-37787fa71eb7" xlink:href="sbcf-20260930.xsd#sbcf_BusinessCombinationRecognizedLiabilityAssumedSecuritiesSoldUnderAgreementsToRepurchase"/>
    <link:calculationArc order="2" weight="1.0" xlink:arcrole="https://xbrl.org/2023/arcrole/summation-item" xlink:from="loc_us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedLiabilities_019fd25f-c60d-7861-999b-2ba02e9471c0" xlink:to="loc_sbcf_BusinessCombinationRecognizedLiabilityAssumedSecuritiesSoldUnderAgreementsToRepurchase_019fd25f-c60d-7616-bf14-37787fa71eb7" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedNoncurrentLiabilitiesOther_019fd25f-c60d-7dc2-98ae-d1887edd11b6" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedNoncurrentLiabilitiesOther"/>
    <link:calculationArc order="3" weight="1.0" xlink:arcrole="https://xbrl.org/2023/arcrole/summation-item" xlink:from="loc_us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedLiabilities_019fd25f-c60d-7861-999b-2ba02e9471c0" xlink:to="loc_us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedNoncurrentLiabilitiesOther_019fd25f-c60d-7dc2-98ae-d1887edd11b6" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_sbcf_BusinessCombinationProvisionalInformationInitialAccountingIncompleteAdjustmentAssets_019fd25f-c60d-7957-aed1-44a280173b06" xlink:href="sbcf-20260930.xsd#sbcf_BusinessCombinationProvisionalInformationInitialAccountingIncompleteAdjustmentAssets"/>
    <link:loc xlink:type="locator" xlink:label="loc_sbcf_BusinessCombinationProvisionalInformationInitialAccountingIncompleteAdjustmentInvestmentSecurities_019fd25f-c60d-7826-bd90-49c558b5b9c9" xlink:href="sbcf-20260930.xsd#sbcf_BusinessCombinationProvisionalInformationInitialAccountingIncompleteAdjustmentInvestmentSecurities"/>
    <link:calculationArc order="1" weight="1.0" xlink:arcrole="https://xbrl.org/2023/arcrole/summation-item" xlink:from="loc_sbcf_BusinessCombinationProvisionalInformationInitialAccountingIncompleteAdjustmentAssets_019fd25f-c60d-7957-aed1-44a280173b06" xlink:to="loc_sbcf_BusinessCombinationProvisionalInformationInitialAccountingIncompleteAdjustmentInvestmentSecurities_019fd25f-c60d-7826-bd90-49c558b5b9c9" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_sbcf_BusinessCombinationProvisionalInformationInitialAccountingIncompleteAdjustmentFinancingReceivableExcludingAccruedInterestAfterAllowanceForCreditLoss_019fd25f-c60d-7b6f-8ab4-3b4c958325ac" xlink:href="sbcf-20260930.xsd#sbcf_BusinessCombinationProvisionalInformationInitialAccountingIncompleteAdjustmentFinancingReceivableExcludingAccruedInterestAfterAllowanceForCreditLoss"/>
    <link:calculationArc order="2" weight="1.0" xlink:arcrole="https://xbrl.org/2023/arcrole/summation-item" xlink:from="loc_sbcf_BusinessCombinationProvisionalInformationInitialAccountingIncompleteAdjustmentAssets_019fd25f-c60d-7957-aed1-44a280173b06" xlink:to="loc_sbcf_BusinessCombinationProvisionalInformationInitialAccountingIncompleteAdjustmentFinancingReceivableExcludingAccruedInterestAfterAllowanceForCreditLoss_019fd25f-c60d-7b6f-8ab4-3b4c958325ac" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_GoodwillPurchaseAccountingAdjustments_01a15c5f-163f-7e0d-8dad-901a3e7252bc" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_GoodwillPurchaseAccountingAdjustments"/>
    <link:calculationArc order="3" weight="1.0" xlink:arcrole="https://xbrl.org/2023/arcrole/summation-item" xlink:from="loc_sbcf_BusinessCombinationProvisionalInformationInitialAccountingIncompleteAdjustmentAssets_019fd25f-c60d-7957-aed1-44a280173b06" xlink:to="loc_us-gaap_GoodwillPurchaseAccountingAdjustments_01a15c5f-163f-7e0d-8dad-901a3e7252bc" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_sbcf_BusinessCombinationProvisionalInformationInitialAccountingIncompleteAdjustmentLiabilities_019fd25f-c60d-7a1a-a344-b251d20d60d4" xlink:href="sbcf-20260930.xsd#sbcf_BusinessCombinationProvisionalInformationInitialAccountingIncompleteAdjustmentLiabilities"/>
    <link:loc xlink:type="locator" xlink:label="loc_sbcf_BusinessCombinationProvisionalInformationInitialAccountingIncompleteAdjustmentNoncurrentLiabilitiesOther_019fd25f-c60d-7e43-a7e4-69bff52ed90f" xlink:href="sbcf-20260930.xsd#sbcf_BusinessCombinationProvisionalInformationInitialAccountingIncompleteAdjustmentNoncurrentLiabilitiesOther"/>
    <link:calculationArc order="1" weight="1.0" xlink:arcrole="https://xbrl.org/2023/arcrole/summation-item" xlink:from="loc_sbcf_BusinessCombinationProvisionalInformationInitialAccountingIncompleteAdjustmentLiabilities_019fd25f-c60d-7a1a-a344-b251d20d60d4" xlink:to="loc_sbcf_BusinessCombinationProvisionalInformationInitialAccountingIncompleteAdjustmentNoncurrentLiabilitiesOther_019fd25f-c60d-7e43-a7e4-69bff52ed90f" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedAssets_019fd25f-c60d-7450-aaaa-04c223b2284d" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedAssets"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedCashAndEquivalents_019fd25f-c60d-7da7-b191-32665f8c1852" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedCashAndEquivalents"/>
    <link:calculationArc order="1" weight="1.0" xlink:arcrole="https://xbrl.org/2023/arcrole/summation-item" xlink:from="loc_us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedAssets_019fd25f-c60d-7450-aaaa-04c223b2284d" xlink:to="loc_us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedCashAndEquivalents_019fd25f-c60d-7da7-b191-32665f8c1852" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_sbcf_BusinessCombinationRecognizedAssetAcquiredInvestmentSecurities_019fd25f-c60d-7b63-a169-616ab3fbf973" xlink:href="sbcf-20260930.xsd#sbcf_BusinessCombinationRecognizedAssetAcquiredInvestmentSecurities"/>
    <link:calculationArc order="2" weight="1.0" xlink:arcrole="https://xbrl.org/2023/arcrole/summation-item" xlink:from="loc_us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedAssets_019fd25f-c60d-7450-aaaa-04c223b2284d" xlink:to="loc_sbcf_BusinessCombinationRecognizedAssetAcquiredInvestmentSecurities_019fd25f-c60d-7b63-a169-616ab3fbf973" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_sbcf_BusinessCombinationRecognizedAssetAcquiredFinancingReceivableExcludingAccruedInterestAfterAllowanceForCreditLoss_019fd25f-c60d-720a-b57f-69a0f2018cae" xlink:href="sbcf-20260930.xsd#sbcf_BusinessCombinationRecognizedAssetAcquiredFinancingReceivableExcludingAccruedInterestAfterAllowanceForCreditLoss"/>
    <link:calculationArc order="3" weight="1.0" xlink:arcrole="https://xbrl.org/2023/arcrole/summation-item" xlink:from="loc_us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedAssets_019fd25f-c60d-7450-aaaa-04c223b2284d" xlink:to="loc_sbcf_BusinessCombinationRecognizedAssetAcquiredFinancingReceivableExcludingAccruedInterestAfterAllowanceForCreditLoss_019fd25f-c60d-720a-b57f-69a0f2018cae" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedPropertyPlantAndEquipment_019fd25f-c60d-787b-aad2-16477efa9880" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedPropertyPlantAndEquipment"/>
    <link:calculationArc order="4" weight="1.0" xlink:arcrole="https://xbrl.org/2023/arcrole/summation-item" xlink:from="loc_us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedAssets_019fd25f-c60d-7450-aaaa-04c223b2284d" xlink:to="loc_us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedPropertyPlantAndEquipment_019fd25f-c60d-787b-aad2-16477efa9880" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedIntangibles_019fd25f-c60d-7fb2-8518-5b3270736b32" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedIntangibles"/>
    <link:calculationArc order="5" weight="1.0" xlink:arcrole="https://xbrl.org/2023/arcrole/summation-item" xlink:from="loc_us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedAssets_019fd25f-c60d-7450-aaaa-04c223b2284d" xlink:to="loc_us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedIntangibles_019fd25f-c60d-7fb2-8518-5b3270736b32" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_Goodwill_019fd25f-c60d-7c8c-95a3-ccbe51161ebc" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_Goodwill"/>
    <link:calculationArc order="6" weight="1.0" xlink:arcrole="https://xbrl.org/2023/arcrole/summation-item" xlink:from="loc_us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedAssets_019fd25f-c60d-7450-aaaa-04c223b2284d" xlink:to="loc_us-gaap_Goodwill_019fd25f-c60d-7c8c-95a3-ccbe51161ebc" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedOtherNoncurrentAssets_019fd25f-c60d-7f36-9cc0-de78c8f6ab02" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedOtherNoncurrentAssets"/>
    <link:calculationArc order="7" weight="1.0" xlink:arcrole="https://xbrl.org/2023/arcrole/summation-item" xlink:from="loc_us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedAssets_019fd25f-c60d-7450-aaaa-04c223b2284d" xlink:to="loc_us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedOtherNoncurrentAssets_019fd25f-c60d-7f36-9cc0-de78c8f6ab02" xlink:type="arc"/>
  </link:calculationLink>
  <link:roleRef roleURI="http://www.seacoastbanking.com/role/BusinessCombinationsScheduleofLoanswithDeteriorationofCreditQualityDetails" xlink:type="simple" xlink:href="sbcf-20260930.xsd#BusinessCombinationsScheduleofLoanswithDeteriorationofCreditQualityDetails"/>
  <link:calculationLink xlink:role="http://www.seacoastbanking.com/role/BusinessCombinationsScheduleofLoanswithDeteriorationofCreditQualityDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FinancingReceivablePurchasedWithCreditDeteriorationAmountAtPurchasePrice_019fd25f-c60d-7083-8c6f-85cf43640bf1" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_FinancingReceivablePurchasedWithCreditDeteriorationAmountAtPurchasePrice"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FinancingReceivablePurchasedWithCreditDeteriorationAllowanceForCreditLossAtAcquisitionDate_019fd25f-c60d-7768-8fc3-4e72f149ee38" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_FinancingReceivablePurchasedWithCreditDeteriorationAllowanceForCreditLossAtAcquisitionDate"/>
    <link:calculationArc order="1" weight="-1.0" xlink:arcrole="https://xbrl.org/2023/arcrole/summation-item" xlink:from="loc_us-gaap_FinancingReceivablePurchasedWithCreditDeteriorationAmountAtPurchasePrice_019fd25f-c60d-7083-8c6f-85cf43640bf1" xlink:to="loc_us-gaap_FinancingReceivablePurchasedWithCreditDeteriorationAllowanceForCreditLossAtAcquisitionDate_019fd25f-c60d-7768-8fc3-4e72f149ee38" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FinancingReceivablePurchasedWithCreditDeteriorationDiscountPremium_019fd25f-c60d-7a4f-b414-8242bac7d107" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_FinancingReceivablePurchasedWithCreditDeteriorationDiscountPremium"/>
    <link:calculationArc order="2" weight="-1.0" xlink:arcrole="https://xbrl.org/2023/arcrole/summation-item" xlink:from="loc_us-gaap_FinancingReceivablePurchasedWithCreditDeteriorationAmountAtPurchasePrice_019fd25f-c60d-7083-8c6f-85cf43640bf1" xlink:to="loc_us-gaap_FinancingReceivablePurchasedWithCreditDeteriorationDiscountPremium_019fd25f-c60d-7a4f-b414-8242bac7d107" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FinancingReceivablePurchasedWithCreditDeteriorationAmountAtParValue_019fd25f-c60d-7e8c-9d46-ac6264dab9eb" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_FinancingReceivablePurchasedWithCreditDeteriorationAmountAtParValue"/>
    <link:calculationArc order="3" weight="1.0" xlink:arcrole="https://xbrl.org/2023/arcrole/summation-item" xlink:from="loc_us-gaap_FinancingReceivablePurchasedWithCreditDeteriorationAmountAtPurchasePrice_019fd25f-c60d-7083-8c6f-85cf43640bf1" xlink:to="loc_us-gaap_FinancingReceivablePurchasedWithCreditDeteriorationAmountAtParValue_019fd25f-c60d-7e8c-9d46-ac6264dab9eb" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_sbcf_BusinessCombinationProvisionalInformationInitialAccountingIncompleteAdjustmentFinancingReceivablePurchasedWithCreditDeteriorationAmountAtPurchasePrice_01a1a1f7-cbc7-7f6f-9373-4ebe6a625fcf" xlink:href="sbcf-20260930.xsd#sbcf_BusinessCombinationProvisionalInformationInitialAccountingIncompleteAdjustmentFinancingReceivablePurchasedWithCreditDeteriorationAmountAtPurchasePrice"/>
    <link:loc xlink:type="locator" xlink:label="loc_sbcf_BusinessCombinationProvisionalInformationInitialAccountingIncompleteAdjustmentFinancingReceivablePurchasedWithCreditDeteriorationAmountAtParValue_01a1a1f7-cbc7-791c-93f1-04472d8e23eb" xlink:href="sbcf-20260930.xsd#sbcf_BusinessCombinationProvisionalInformationInitialAccountingIncompleteAdjustmentFinancingReceivablePurchasedWithCreditDeteriorationAmountAtParValue"/>
    <link:calculationArc order="1" weight="1.0" xlink:arcrole="https://xbrl.org/2023/arcrole/summation-item" xlink:from="loc_sbcf_BusinessCombinationProvisionalInformationInitialAccountingIncompleteAdjustmentFinancingReceivablePurchasedWithCreditDeteriorationAmountAtPurchasePrice_01a1a1f7-cbc7-7f6f-9373-4ebe6a625fcf" xlink:to="loc_sbcf_BusinessCombinationProvisionalInformationInitialAccountingIncompleteAdjustmentFinancingReceivablePurchasedWithCreditDeteriorationAmountAtParValue_01a1a1f7-cbc7-791c-93f1-04472d8e23eb" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_sbcf_BusinessCombinationProvisionalInformationInitialAccountingIncompleteAdjustmentFinancingReceivablePurchasedWithCreditDeteriorationAllowanceForCreditLossAtAcquisitionDate_01a1a1f7-cbc7-7d87-9d65-21871a2bcd74" xlink:href="sbcf-20260930.xsd#sbcf_BusinessCombinationProvisionalInformationInitialAccountingIncompleteAdjustmentFinancingReceivablePurchasedWithCreditDeteriorationAllowanceForCreditLossAtAcquisitionDate"/>
    <link:calculationArc order="2" weight="-1.0" xlink:arcrole="https://xbrl.org/2023/arcrole/summation-item" xlink:from="loc_sbcf_BusinessCombinationProvisionalInformationInitialAccountingIncompleteAdjustmentFinancingReceivablePurchasedWithCreditDeteriorationAmountAtPurchasePrice_01a1a1f7-cbc7-7f6f-9373-4ebe6a625fcf" xlink:to="loc_sbcf_BusinessCombinationProvisionalInformationInitialAccountingIncompleteAdjustmentFinancingReceivablePurchasedWithCreditDeteriorationAllowanceForCreditLossAtAcquisitionDate_01a1a1f7-cbc7-7d87-9d65-21871a2bcd74" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_sbcf_BusinessCombinationProvisionalInformationInitialAccountingIncompleteAdjustmentFinancingReceivablePurchasedWithCreditDeteriorationDiscountPremium_01a1a1f7-cbc7-7053-82db-2d2ad6faa452" xlink:href="sbcf-20260930.xsd#sbcf_BusinessCombinationProvisionalInformationInitialAccountingIncompleteAdjustmentFinancingReceivablePurchasedWithCreditDeteriorationDiscountPremium"/>
    <link:calculationArc order="3" weight="-1.0" xlink:arcrole="https://xbrl.org/2023/arcrole/summation-item" xlink:from="loc_sbcf_BusinessCombinationProvisionalInformationInitialAccountingIncompleteAdjustmentFinancingReceivablePurchasedWithCreditDeteriorationAmountAtPurchasePrice_01a1a1f7-cbc7-7f6f-9373-4ebe6a625fcf" xlink:to="loc_sbcf_BusinessCombinationProvisionalInformationInitialAccountingIncompleteAdjustmentFinancingReceivablePurchasedWithCreditDeteriorationDiscountPremium_01a1a1f7-cbc7-7053-82db-2d2ad6faa452" xlink:type="arc"/>
  </link:calculationLink>
</link:linkbase>
