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

<!--XBRL Document Created with the Workiva Platform-->
<!--Copyright 2026 Workiva-->
<!--r:019e22d7-d897-7ca5-bdfd-043e7c24aa6c,g:b79b97ce-1fb8-4252-a96f-ea718e7a3d21-->
<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-20260630.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_InterestIncomeExpenseNet_019e22d7-dc20-7765-8b3e-bb9545bbf89c" 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_019e22d7-dc20-7ec0-8815-56212f7d3aad" 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_019e22d7-dc20-7765-8b3e-bb9545bbf89c" xlink:to="loc_us-gaap_InterestAndDividendIncomeOperating_019e22d7-dc20-7ec0-8815-56212f7d3aad" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_InterestExpenseOperating_019e22d7-dc20-7374-8811-379b69b7da01" 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_019e22d7-dc20-7765-8b3e-bb9545bbf89c" xlink:to="loc_us-gaap_InterestExpenseOperating_019e22d7-dc20-7374-8811-379b69b7da01" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_NetIncomeLoss_019e22d7-dc20-76cc-b007-bed9bf09b342" 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_019e22d7-dc20-7ae7-8bb6-4ded380d0bfb" 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_019e22d7-dc20-76cc-b007-bed9bf09b342" xlink:to="loc_us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest_019e22d7-dc20-7ae7-8bb6-4ded380d0bfb" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_IncomeTaxExpenseBenefit_019e22d7-dc20-7774-b006-86833e443870" 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_019e22d7-dc20-76cc-b007-bed9bf09b342" xlink:to="loc_us-gaap_IncomeTaxExpenseBenefit_019e22d7-dc20-7774-b006-86833e443870" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_InterestAndDividendIncomeOperating_019e22d7-dc20-7050-b70a-439e02b0bb58" 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_019e22d7-dc20-7d74-b49f-0f3b810681a8" 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_019e22d7-dc20-7050-b70a-439e02b0bb58" xlink:to="loc_us-gaap_InterestAndFeeIncomeLoansAndLeases_019e22d7-dc20-7d74-b49f-0f3b810681a8" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_InterestAndDividendIncomeSecurities_019e22d7-dc20-7c21-8480-c3fcfd1d0182" 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_019e22d7-dc20-7050-b70a-439e02b0bb58" xlink:to="loc_us-gaap_InterestAndDividendIncomeSecurities_019e22d7-dc20-7c21-8480-c3fcfd1d0182" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_sbcf_InterestOnFederalFundsSoldAndInterestBearingDeposits_019e22d7-dc20-752e-a901-86d554823456" xlink:href="sbcf-20260630.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_019e22d7-dc20-7050-b70a-439e02b0bb58" xlink:to="loc_sbcf_InterestOnFederalFundsSoldAndInterestBearingDeposits_019e22d7-dc20-752e-a901-86d554823456" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_InterestIncomeExpenseAfterProvisionForLoanLoss_019e22d7-dc20-72eb-af2b-1f8069dcb7d5" 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_019e22d7-dc20-7ea7-bb2a-133c1609d5b7" 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_019e22d7-dc20-72eb-af2b-1f8069dcb7d5" xlink:to="loc_us-gaap_InterestIncomeExpenseNet_019e22d7-dc20-7ea7-bb2a-133c1609d5b7" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_sbcf_FinancingReceivableAndAccruedInterestReceivableCreditLossProvisionReversal_019e22d7-dc20-77b3-90e4-500a64aaba04" xlink:href="sbcf-20260630.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_019e22d7-dc20-72eb-af2b-1f8069dcb7d5" xlink:to="loc_sbcf_FinancingReceivableAndAccruedInterestReceivableCreditLossProvisionReversal_019e22d7-dc20-77b3-90e4-500a64aaba04" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_sbcf_NetIncomeLossAvailableToCommonStockholdersBeforeEarningsLossAllocatedToParticipatingSecurities_019f3755-c5cb-74a1-82da-01eb39d050d6" xlink:href="sbcf-20260630.xsd#sbcf_NetIncomeLossAvailableToCommonStockholdersBeforeEarningsLossAllocatedToParticipatingSecurities"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_NetIncomeLoss_019f3755-c5cb-7161-b30e-45d0c23212f0" 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_019f3755-c5cb-74a1-82da-01eb39d050d6" xlink:to="loc_us-gaap_NetIncomeLoss_019f3755-c5cb-7161-b30e-45d0c23212f0" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PreferredStockDividendsIncomeStatementImpact_019f3755-c5cb-7da6-ae63-de65c1ea6f4b" 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_019f3755-c5cb-74a1-82da-01eb39d050d6" xlink:to="loc_us-gaap_PreferredStockDividendsIncomeStatementImpact_019f3755-c5cb-7da6-ae63-de65c1ea6f4b" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_NoninterestExpense_019e22d7-dc20-74e0-9a0e-8e21588297f7" 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_019e22d7-dc20-799e-8861-22e053824734" 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_019e22d7-dc20-74e0-9a0e-8e21588297f7" xlink:to="loc_us-gaap_OccupancyNet_019e22d7-dc20-799e-8861-22e053824734" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ProfessionalFees_019e22d7-dc20-7d74-b8d9-bcc215318966" 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_019e22d7-dc20-74e0-9a0e-8e21588297f7" xlink:to="loc_us-gaap_ProfessionalFees_019e22d7-dc20-7d74-b8d9-bcc215318966" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_sbcf_FurnitureAndEquipmentExpense_019e22d7-dc20-7bcb-84a8-6762ac7130ae" xlink:href="sbcf-20260630.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_019e22d7-dc20-74e0-9a0e-8e21588297f7" xlink:to="loc_sbcf_FurnitureAndEquipmentExpense_019e22d7-dc20-7bcb-84a8-6762ac7130ae" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LaborAndRelatedExpense_019e22d7-dc20-736e-a68d-756f18462eea" 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_019e22d7-dc20-74e0-9a0e-8e21588297f7" xlink:to="loc_us-gaap_LaborAndRelatedExpense_019e22d7-dc20-736e-a68d-756f18462eea" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_sbcf_FederalDepositInsuranceCorporationAssessment_019e22d7-dc20-7373-8099-1beef210cf70" xlink:href="sbcf-20260630.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_019e22d7-dc20-74e0-9a0e-8e21588297f7" xlink:to="loc_sbcf_FederalDepositInsuranceCorporationAssessment_019e22d7-dc20-7373-8099-1beef210cf70" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AmortizationOfIntangibleAssets_019e22d7-dc20-7776-b4b7-fc2f8ec3126d" 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_019e22d7-dc20-74e0-9a0e-8e21588297f7" xlink:to="loc_us-gaap_AmortizationOfIntangibleAssets_019e22d7-dc20-7776-b4b7-fc2f8ec3126d" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_OtherNoninterestExpense_019e22d7-dc20-7442-9c22-97ded898361a" 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_019e22d7-dc20-74e0-9a0e-8e21588297f7" xlink:to="loc_us-gaap_OtherNoninterestExpense_019e22d7-dc20-7442-9c22-97ded898361a" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_InformationTechnologyAndDataProcessing_019e22d7-dc20-7529-b2f1-c61f12f2fd5d" 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_019e22d7-dc20-74e0-9a0e-8e21588297f7" xlink:to="loc_us-gaap_InformationTechnologyAndDataProcessing_019e22d7-dc20-7529-b2f1-c61f12f2fd5d" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_GainsLossesOnSalesOfInvestmentRealEstate_019e22d7-dc20-7fb6-a3cc-06f067358b80" 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_019e22d7-dc20-74e0-9a0e-8e21588297f7" xlink:to="loc_us-gaap_GainsLossesOnSalesOfInvestmentRealEstate_019e22d7-dc20-7fb6-a3cc-06f067358b80" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_OffBalanceSheetCreditLossLiabilityCreditLossExpenseReversal_019e22d7-dc20-7a87-b99d-f82cc23beaf1" 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_019e22d7-dc20-74e0-9a0e-8e21588297f7" xlink:to="loc_us-gaap_OffBalanceSheetCreditLossLiabilityCreditLossExpenseReversal_019e22d7-dc20-7a87-b99d-f82cc23beaf1" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_BusinessCombinationAcquisitionRelatedCosts_019e22d7-dc20-7a4a-b8d4-4f3b5e58d43e" 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_019e22d7-dc20-74e0-9a0e-8e21588297f7" xlink:to="loc_us-gaap_BusinessCombinationAcquisitionRelatedCosts_019e22d7-dc20-7a4a-b8d4-4f3b5e58d43e" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_MarketingExpense_019e22d7-dc20-7114-bd60-81bd33d53a63" 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_019e22d7-dc20-74e0-9a0e-8e21588297f7" xlink:to="loc_us-gaap_MarketingExpense_019e22d7-dc20-7114-bd60-81bd33d53a63" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest_019e22d7-dc20-7bd7-9674-271e79fcecf9" 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_019e22d7-dc20-7988-aeb5-af1437b2c02e" 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_019e22d7-dc20-7bd7-9674-271e79fcecf9" xlink:to="loc_us-gaap_NoninterestIncome_019e22d7-dc20-7988-aeb5-af1437b2c02e" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_InterestIncomeExpenseAfterProvisionForLoanLoss_019e22d7-dc20-76a0-8dcb-d4bb06a794b1" 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_019e22d7-dc20-7bd7-9674-271e79fcecf9" xlink:to="loc_us-gaap_InterestIncomeExpenseAfterProvisionForLoanLoss_019e22d7-dc20-76a0-8dcb-d4bb06a794b1" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_NoninterestExpense_019e22d7-dc20-7011-9dd7-67ae6ebefbc0" 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_019e22d7-dc20-7bd7-9674-271e79fcecf9" xlink:to="loc_us-gaap_NoninterestExpense_019e22d7-dc20-7011-9dd7-67ae6ebefbc0" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_sbcf_NonInterestIncomeExcludingGainLossOnLoansSaleAndInvestments_019e22d7-dc20-7b06-87a7-4499dd848385" xlink:href="sbcf-20260630.xsd#sbcf_NonInterestIncomeExcludingGainLossOnLoansSaleAndInvestments"/>
    <link:loc xlink:type="locator" xlink:label="loc_sbcf_NoninterestIncomeServicingCharges_019e22d7-dc20-78fd-81cf-c792c90eb922" xlink:href="sbcf-20260630.xsd#sbcf_NoninterestIncomeServicingCharges"/>
    <link:calculationArc order="1" weight="1.0" xlink:arcrole="https://xbrl.org/2023/arcrole/summation-item" xlink:from="loc_sbcf_NonInterestIncomeExcludingGainLossOnLoansSaleAndInvestments_019e22d7-dc20-7b06-87a7-4499dd848385" xlink:to="loc_sbcf_NoninterestIncomeServicingCharges_019e22d7-dc20-78fd-81cf-c792c90eb922" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FeesAndCommissionsMortgageBankingAndServicing_019e22d7-dc20-741b-a33b-8bd9bbf99a6a" 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_019e22d7-dc20-7b06-87a7-4499dd848385" xlink:to="loc_us-gaap_FeesAndCommissionsMortgageBankingAndServicing_019e22d7-dc20-741b-a33b-8bd9bbf99a6a" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_InsuranceServicesRevenue_019e22d7-dc20-7a9a-8afd-774ff14cf82d" 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_019e22d7-dc20-7b06-87a7-4499dd848385" xlink:to="loc_us-gaap_InsuranceServicesRevenue_019e22d7-dc20-7a9a-8afd-774ff14cf82d" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_BankOwnedLifeInsuranceIncome_019e22d7-dc20-7d2a-aa12-53fe19ec59a5" 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_019e22d7-dc20-7b06-87a7-4499dd848385" xlink:to="loc_us-gaap_BankOwnedLifeInsuranceIncome_019e22d7-dc20-7d2a-aa12-53fe19ec59a5" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_sbcf_InterchangeIncome_019e22d7-dc20-70d3-a9e7-661cf567a19c" xlink:href="sbcf-20260630.xsd#sbcf_InterchangeIncome"/>
    <link:calculationArc order="5" weight="1.0" xlink:arcrole="https://xbrl.org/2023/arcrole/summation-item" xlink:from="loc_sbcf_NonInterestIncomeExcludingGainLossOnLoansSaleAndInvestments_019e22d7-dc20-7b06-87a7-4499dd848385" xlink:to="loc_sbcf_InterchangeIncome_019e22d7-dc20-70d3-a9e7-661cf567a19c" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_InvestmentBankingAdvisoryBrokerageAndUnderwritingFeesAndCommissions_019e22d7-dc20-7863-99e1-57fbae89d8a5" 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_019e22d7-dc20-7b06-87a7-4499dd848385" xlink:to="loc_us-gaap_InvestmentBankingAdvisoryBrokerageAndUnderwritingFeesAndCommissions_019e22d7-dc20-7863-99e1-57fbae89d8a5" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_NoninterestIncomeOtherOperatingIncome_019e22d7-dc20-7ebe-ab0a-6129e17ead02" 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_019e22d7-dc20-7b06-87a7-4499dd848385" xlink:to="loc_us-gaap_NoninterestIncomeOtherOperatingIncome_019e22d7-dc20-7ebe-ab0a-6129e17ead02" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_InterestExpenseOperating_019e22d7-dc20-70b5-a7f4-52a6e0f025db" 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_019e22d7-dc20-74e4-bee3-f7bb4dc4ed8d" 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_019e22d7-dc20-70b5-a7f4-52a6e0f025db" xlink:to="loc_us-gaap_InterestExpenseSavingsDeposits_019e22d7-dc20-74e4-bee3-f7bb4dc4ed8d" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_InterestExpenseTimeDeposits_019e22d7-dc20-7cdf-8b70-deec273193cf" 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_019e22d7-dc20-70b5-a7f4-52a6e0f025db" xlink:to="loc_us-gaap_InterestExpenseTimeDeposits_019e22d7-dc20-7cdf-8b70-deec273193cf" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_InterestExpenseBorrowings_019e22d7-dc20-716a-ab79-bb9cb457bcdb" 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_019e22d7-dc20-70b5-a7f4-52a6e0f025db" xlink:to="loc_us-gaap_InterestExpenseBorrowings_019e22d7-dc20-716a-ab79-bb9cb457bcdb" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_NoninterestIncome_019e22d7-dc20-77f0-ae6f-8a555824ba9d" 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_019e22d7-dc20-7c8a-8195-dac7a6e197b0" 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_019e22d7-dc20-77f0-ae6f-8a555824ba9d" xlink:to="loc_us-gaap_GainLossOnInvestments_019e22d7-dc20-7c8a-8195-dac7a6e197b0" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_sbcf_NonInterestIncomeExcludingGainLossOnLoansSaleAndInvestments_019e22d7-dc20-79dd-b52c-d64846c8694d" xlink:href="sbcf-20260630.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_019e22d7-dc20-77f0-ae6f-8a555824ba9d" xlink:to="loc_sbcf_NonInterestIncomeExcludingGainLossOnLoansSaleAndInvestments_019e22d7-dc20-79dd-b52c-d64846c8694d" xlink:type="arc"/>
  </link:calculationLink>
  <link:roleRef roleURI="http://www.seacoastbanking.com/role/CONSOLIDATEDSTATEMENTSOFCOMPREHENSIVEINCOMELOSSUnaudited" xlink:type="simple" xlink:href="sbcf-20260630.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_OtherComprehensiveIncomeLossNetOfTaxPortionAttributableToParent_019e22d7-dc20-7aa7-97fa-466c5c8b1296" 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_019e22d7-dc20-73ce-99fc-389e58b8f874" xlink:href="sbcf-20260630.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_019e22d7-dc20-7aa7-97fa-466c5c8b1296" xlink:to="loc_sbcf_OtherComprehensiveIncomeLossFairValueHedgeGainLossAfterReclassificationAndTaxParent_019e22d7-dc20-73ce-99fc-389e58b8f874" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_OtherComprehensiveIncomeUnrealizedHoldingGainLossOnSecuritiesArisingDuringPeriodNetOfTax_019e22d7-dc20-7cbd-8f2d-facc216a3b08" 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_019e22d7-dc20-7aa7-97fa-466c5c8b1296" xlink:to="loc_us-gaap_OtherComprehensiveIncomeUnrealizedHoldingGainLossOnSecuritiesArisingDuringPeriodNetOfTax_019e22d7-dc20-7cbd-8f2d-facc216a3b08" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIForSaleOfSecuritiesNetOfTax_019e22d7-dc20-7616-b929-f7e9b0100249" 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_019e22d7-dc20-7aa7-97fa-466c5c8b1296" xlink:to="loc_us-gaap_OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIForSaleOfSecuritiesNetOfTax_019e22d7-dc20-7616-b929-f7e9b0100249" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_OciDebtSecuritiesAvailableForSaleTransferToHeldToMaturityAdjustmentFromAociForAmortizationOfGainLossAfterTax_019e22d7-dc20-7b00-ad87-0a1c561132bc" 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_019e22d7-dc20-7aa7-97fa-466c5c8b1296" xlink:to="loc_us-gaap_OciDebtSecuritiesAvailableForSaleTransferToHeldToMaturityAdjustmentFromAociForAmortizationOfGainLossAfterTax_019e22d7-dc20-7b00-ad87-0a1c561132bc" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_OtherComprehensiveIncomeLossCashFlowHedgeGainLossAfterReclassificationAndTaxParent_019e38c0-0431-7e29-9968-ccfbfd3f9710" 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_019e22d7-dc20-7aa7-97fa-466c5c8b1296" xlink:to="loc_us-gaap_OtherComprehensiveIncomeLossCashFlowHedgeGainLossAfterReclassificationAndTaxParent_019e38c0-0431-7e29-9968-ccfbfd3f9710" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ComprehensiveIncomeNetOfTax_019e22d7-dc20-7763-89c8-901844a18733" 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_019e22d7-dc20-736f-a36d-c36091366141" 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_019e22d7-dc20-7763-89c8-901844a18733" xlink:to="loc_us-gaap_NetIncomeLoss_019e22d7-dc20-736f-a36d-c36091366141" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_OtherComprehensiveIncomeLossNetOfTaxPortionAttributableToParent_019e22d7-dc20-7dbe-ae17-07463ff95924" 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_019e22d7-dc20-7763-89c8-901844a18733" xlink:to="loc_us-gaap_OtherComprehensiveIncomeLossNetOfTaxPortionAttributableToParent_019e22d7-dc20-7dbe-ae17-07463ff95924" xlink:type="arc"/>
  </link:calculationLink>
  <link:roleRef roleURI="http://www.seacoastbanking.com/role/CONSOLIDATEDBALANCESHEETSUnaudited" xlink:type="simple" xlink:href="sbcf-20260630.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_Assets_019e22d7-dc20-74a6-b365-9feb52955d1f" 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_019e22d7-dc20-72b1-b5fc-11f97dd24158" 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_019e22d7-dc20-74a6-b365-9feb52955d1f" xlink:to="loc_us-gaap_CashAndCashEquivalentsAtCarryingValue_019e22d7-dc20-72b1-b5fc-11f97dd24158" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_sbcf_TimeDepositsWithOtherBanks_019e22d7-dc20-726f-8567-2b8e52383c3a" xlink:href="sbcf-20260630.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_019e22d7-dc20-74a6-b365-9feb52955d1f" xlink:to="loc_sbcf_TimeDepositsWithOtherBanks_019e22d7-dc20-726f-8567-2b8e52383c3a" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_Investments_019e22d7-dc20-7a2e-aa38-c62d1d2df3a2" 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_019e22d7-dc20-74a6-b365-9feb52955d1f" xlink:to="loc_us-gaap_Investments_019e22d7-dc20-7a2e-aa38-c62d1d2df3a2" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FinancingReceivableExcludingAccruedInterestAfterAllowanceForCreditLoss_019e22d7-dc20-7f5d-9d1f-23360b295421" 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_019e22d7-dc20-74a6-b365-9feb52955d1f" xlink:to="loc_us-gaap_FinancingReceivableExcludingAccruedInterestAfterAllowanceForCreditLoss_019e22d7-dc20-7f5d-9d1f-23360b295421" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PropertyPlantAndEquipmentNet_019e22d7-dc20-7c94-9c50-05786e406f85" 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_019e22d7-dc20-74a6-b365-9feb52955d1f" xlink:to="loc_us-gaap_PropertyPlantAndEquipmentNet_019e22d7-dc20-7c94-9c50-05786e406f85" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_Goodwill_019e22d7-dc20-7b55-ac3a-d0cd7b772124" 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_019e22d7-dc20-74a6-b365-9feb52955d1f" xlink:to="loc_us-gaap_Goodwill_019e22d7-dc20-7b55-ac3a-d0cd7b772124" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_IntangibleAssetsNetExcludingGoodwill_019e22d7-dc20-7305-8038-d1e787ffb944" 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_019e22d7-dc20-74a6-b365-9feb52955d1f" xlink:to="loc_us-gaap_IntangibleAssetsNetExcludingGoodwill_019e22d7-dc20-7305-8038-d1e787ffb944" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_BankOwnedLifeInsurance_019e22d7-dc20-7021-8e46-76179dfc4de3" 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_019e22d7-dc20-74a6-b365-9feb52955d1f" xlink:to="loc_us-gaap_BankOwnedLifeInsurance_019e22d7-dc20-7021-8e46-76179dfc4de3" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DeferredIncomeTaxAssetsNet_019e22d7-dc20-7a15-950b-2c5b62391b8d" 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_019e22d7-dc20-74a6-b365-9feb52955d1f" xlink:to="loc_us-gaap_DeferredIncomeTaxAssetsNet_019e22d7-dc20-7a15-950b-2c5b62391b8d" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_OtherAssets_019e22d7-dc20-7e70-a910-b42b4c7960b2" 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_019e22d7-dc20-74a6-b365-9feb52955d1f" xlink:to="loc_us-gaap_OtherAssets_019e22d7-dc20-7e70-a910-b42b4c7960b2" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LoansReceivableHeldForSaleNetNotPartOfDisposalGroup_019e22d7-dc20-777c-a2a4-9b0731b0238b" 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_019e22d7-dc20-74a6-b365-9feb52955d1f" xlink:to="loc_us-gaap_LoansReceivableHeldForSaleNetNotPartOfDisposalGroup_019e22d7-dc20-777c-a2a4-9b0731b0238b" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CashAndCashEquivalentsAtCarryingValue_019e22d7-dc20-7a5a-8b1f-74a366a40cd6" 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_019e22d7-dc20-7abb-b0f1-200d3abd3ebc" 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_019e22d7-dc20-7a5a-8b1f-74a366a40cd6" xlink:to="loc_us-gaap_CashAndDueFromBanks_019e22d7-dc20-7abb-b0f1-200d3abd3ebc" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_InterestBearingDepositsInBanks_019e22d7-dc20-7595-a6f4-24c0d12a1cca" 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_019e22d7-dc20-7a5a-8b1f-74a366a40cd6" xlink:to="loc_us-gaap_InterestBearingDepositsInBanks_019e22d7-dc20-7595-a6f4-24c0d12a1cca" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FinancingReceivableExcludingAccruedInterestAfterAllowanceForCreditLoss_019e22d7-dc20-7a42-ba4b-36c04ed0709b" 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_019e22d7-dc20-700d-bdec-e9cd88cea153" 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_019e22d7-dc20-7a42-ba4b-36c04ed0709b" xlink:to="loc_us-gaap_FinancingReceivableExcludingAccruedInterestBeforeAllowanceForCreditLoss_019e22d7-dc20-700d-bdec-e9cd88cea153" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FinancingReceivableAllowanceForCreditLossExcludingAccruedInterest_019e22d7-dc20-7749-b8c3-3418c3e0943a" 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_019e22d7-dc20-7a42-ba4b-36c04ed0709b" xlink:to="loc_us-gaap_FinancingReceivableAllowanceForCreditLossExcludingAccruedInterest_019e22d7-dc20-7749-b8c3-3418c3e0943a" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_Investments_019e22d7-dc20-706a-abb5-b72f4edb5cdc" 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_019e22d7-dc20-78e4-86f0-789b0174ea56" 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_019e22d7-dc20-706a-abb5-b72f4edb5cdc" xlink:to="loc_us-gaap_DebtSecuritiesAvailableForSaleExcludingAccruedInterest_019e22d7-dc20-78e4-86f0-789b0174ea56" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtSecuritiesHeldToMaturityExcludingAccruedInterestAfterAllowanceForCreditLoss_019e22d7-dc20-7486-a781-55afa9850deb" 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_019e22d7-dc20-706a-abb5-b72f4edb5cdc" xlink:to="loc_us-gaap_DebtSecuritiesHeldToMaturityExcludingAccruedInterestAfterAllowanceForCreditLoss_019e22d7-dc20-7486-a781-55afa9850deb" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_Liabilities_019e22d7-dc20-7c12-98af-0df21f038909" 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_019e22d7-dc20-7892-90b2-18ea1a6d5c3e" 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_019e22d7-dc20-7c12-98af-0df21f038909" xlink:to="loc_us-gaap_OtherLiabilities_019e22d7-dc20-7892-90b2-18ea1a6d5c3e" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_Deposits_019e22d7-dc20-7cae-bb78-65a1f825276d" 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_019e22d7-dc20-7c12-98af-0df21f038909" xlink:to="loc_us-gaap_Deposits_019e22d7-dc20-7cae-bb78-65a1f825276d" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_SecuritiesSoldUnderAgreementsToRepurchase_019e22d7-dc20-7c12-8f14-9e480bc27937" 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_019e22d7-dc20-7c12-98af-0df21f038909" xlink:to="loc_us-gaap_SecuritiesSoldUnderAgreementsToRepurchase_019e22d7-dc20-7c12-8f14-9e480bc27937" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LongTermDebt_019e22d7-dc20-7949-852c-3dc9e9e83905" 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_019e22d7-dc20-7c12-98af-0df21f038909" xlink:to="loc_us-gaap_LongTermDebt_019e22d7-dc20-7949-852c-3dc9e9e83905" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AdvancesFromFederalHomeLoanBanks_019e22d7-dc20-77c6-855f-ef6a962bb7d6" 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_019e22d7-dc20-7c12-98af-0df21f038909" xlink:to="loc_us-gaap_AdvancesFromFederalHomeLoanBanks_019e22d7-dc20-77c6-855f-ef6a962bb7d6" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LiabilitiesAndStockholdersEquity_019e22d7-dc20-74ef-a938-2093d01f2f64" 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_019e22d7-dc20-77d7-8473-977446f872e4" 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_019e22d7-dc20-74ef-a938-2093d01f2f64" xlink:to="loc_us-gaap_Liabilities_019e22d7-dc20-77d7-8473-977446f872e4" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_StockholdersEquity_019e22d7-dc20-7e91-9018-033c48e12610" 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_019e22d7-dc20-74ef-a938-2093d01f2f64" xlink:to="loc_us-gaap_StockholdersEquity_019e22d7-dc20-7e91-9018-033c48e12610" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_TemporaryEquityCarryingAmountAttributableToParent_019e38f4-143c-702c-875d-25ddeb08aeb4" 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_019e22d7-dc20-74ef-a938-2093d01f2f64" xlink:to="loc_us-gaap_TemporaryEquityCarryingAmountAttributableToParent_019e38f4-143c-702c-875d-25ddeb08aeb4" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_StockholdersEquity_019e22d7-dc20-7f26-b655-95e2b0dcb0b8" 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_019e22d7-dc20-7c1b-b0b0-4cf62de02915" xlink:href="sbcf-20260630.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_019e22d7-dc20-7f26-b655-95e2b0dcb0b8" xlink:to="loc_sbcf_StockholdersEquityBeforeAccumulatedOtherComprehensiveIncome_019e22d7-dc20-7c1b-b0b0-4cf62de02915" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AccumulatedOtherComprehensiveIncomeLossNetOfTax_019e22d7-dc20-72ee-9801-0c2daa5a7f7d" 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_019e22d7-dc20-7f26-b655-95e2b0dcb0b8" xlink:to="loc_us-gaap_AccumulatedOtherComprehensiveIncomeLossNetOfTax_019e22d7-dc20-72ee-9801-0c2daa5a7f7d" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_sbcf_StockholdersEquityBeforeAccumulatedOtherComprehensiveIncome_019e22d7-dc20-7405-a880-878c0260223a" xlink:href="sbcf-20260630.xsd#sbcf_StockholdersEquityBeforeAccumulatedOtherComprehensiveIncome"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_TreasuryStockValue_019e22d7-dc20-7bd6-bff3-235c0ea9ac14" 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_019e22d7-dc20-7405-a880-878c0260223a" xlink:to="loc_us-gaap_TreasuryStockValue_019e22d7-dc20-7bd6-bff3-235c0ea9ac14" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AdditionalPaidInCapital_019e22d7-dc20-775f-b335-9217806e0c2e" 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_019e22d7-dc20-7405-a880-878c0260223a" xlink:to="loc_us-gaap_AdditionalPaidInCapital_019e22d7-dc20-775f-b335-9217806e0c2e" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CommonStockValue_019e22d7-dc20-7f31-8b37-745fffb65026" 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_019e22d7-dc20-7405-a880-878c0260223a" xlink:to="loc_us-gaap_CommonStockValue_019e22d7-dc20-7f31-8b37-745fffb65026" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RetainedEarningsAccumulatedDeficit_019e22d7-dc20-73b1-a8b4-7653a9ac0562" 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_019e22d7-dc20-7405-a880-878c0260223a" xlink:to="loc_us-gaap_RetainedEarningsAccumulatedDeficit_019e22d7-dc20-73b1-a8b4-7653a9ac0562" xlink:type="arc"/>
  </link:calculationLink>
  <link:roleRef roleURI="http://www.seacoastbanking.com/role/CONSOLIDATEDSTATEMENTSOFCASHFLOWSUnaudited" xlink:type="simple" xlink:href="sbcf-20260630.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_NetCashProvidedByUsedInInvestingActivities_019e932a-f589-72c1-a25e-8c0ff7615d7e" 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_019e932a-f589-7d8d-abd6-3c2b5a210995" 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_019e932a-f589-72c1-a25e-8c0ff7615d7e" xlink:to="loc_us-gaap_ProceedsFromMaturitiesPrepaymentsAndCallsOfAvailableForSaleSecurities_019e932a-f589-7d8d-abd6-3c2b5a210995" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ProceedsFromMaturitiesPrepaymentsAndCallsOfHeldToMaturitySecurities_019e932a-f589-741c-8693-634ac5523eb5" 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_019e932a-f589-72c1-a25e-8c0ff7615d7e" xlink:to="loc_us-gaap_ProceedsFromMaturitiesPrepaymentsAndCallsOfHeldToMaturitySecurities_019e932a-f589-741c-8693-634ac5523eb5" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ProceedsFromSaleOfAvailableForSaleSecuritiesDebt_019e932a-f589-71a8-b0f7-77cbdc08b523" 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_019e932a-f589-72c1-a25e-8c0ff7615d7e" xlink:to="loc_us-gaap_ProceedsFromSaleOfAvailableForSaleSecuritiesDebt_019e932a-f589-71a8-b0f7-77cbdc08b523" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PaymentsToAcquireAvailableForSaleSecuritiesDebt_019e932a-f589-7553-bedd-283903c74948" 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_019e932a-f589-72c1-a25e-8c0ff7615d7e" xlink:to="loc_us-gaap_PaymentsToAcquireAvailableForSaleSecuritiesDebt_019e932a-f589-7553-bedd-283903c74948" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_sbcf_ProceedsFromSaleAndMaturityOfTimeDepositsHeldWithOtherBanks_019e932a-f589-7ffa-b039-39d7a966037c" xlink:href="sbcf-20260630.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_019e932a-f589-72c1-a25e-8c0ff7615d7e" xlink:to="loc_sbcf_ProceedsFromSaleAndMaturityOfTimeDepositsHeldWithOtherBanks_019e932a-f589-7ffa-b039-39d7a966037c" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_sbcf_PaymentsForProceedsFromNewLoansAndPrincipalRepaymentsInvestingActivities_019e932a-f589-754e-9ff9-77a043f6b2b5" xlink:href="sbcf-20260630.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_019e932a-f589-72c1-a25e-8c0ff7615d7e" xlink:to="loc_sbcf_PaymentsForProceedsFromNewLoansAndPrincipalRepaymentsInvestingActivities_019e932a-f589-754e-9ff9-77a043f6b2b5" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ProceedsFromSaleOfLoansHeldForInvestment_019e932a-f589-73a4-861e-124faf0aa481" 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_019e932a-f589-72c1-a25e-8c0ff7615d7e" xlink:to="loc_us-gaap_ProceedsFromSaleOfLoansHeldForInvestment_019e932a-f589-73a4-861e-124faf0aa481" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ProceedsFromSaleOfForeclosedAssets_019e932a-f589-7da5-b7bf-99f0be601699" 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_019e932a-f589-72c1-a25e-8c0ff7615d7e" xlink:to="loc_us-gaap_ProceedsFromSaleOfForeclosedAssets_019e932a-f589-7da5-b7bf-99f0be601699" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ProceedsFromSaleOfFederalReserveStock_019e932a-f589-7d10-a682-a93025245734" 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_019e932a-f589-72c1-a25e-8c0ff7615d7e" xlink:to="loc_us-gaap_ProceedsFromSaleOfFederalReserveStock_019e932a-f589-7d10-a682-a93025245734" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PaymentsToAcquireFederalReserveStock_019e932a-f589-7fcc-af9f-0def68b88ec5" 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_019e932a-f589-72c1-a25e-8c0ff7615d7e" xlink:to="loc_us-gaap_PaymentsToAcquireFederalReserveStock_019e932a-f589-7fcc-af9f-0def68b88ec5" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ProceedsFromLifeInsurancePolicies_019e932a-f589-747e-bba9-860b39975086" 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_019e932a-f589-72c1-a25e-8c0ff7615d7e" xlink:to="loc_us-gaap_ProceedsFromLifeInsurancePolicies_019e932a-f589-747e-bba9-860b39975086" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_sbcf_AdditionsToBankPremisesAndEquipment_019e932a-f589-77b5-9823-ea591db57af2" xlink:href="sbcf-20260630.xsd#sbcf_AdditionsToBankPremisesAndEquipment"/>
    <link:calculationArc order="12" weight="-1.0" xlink:arcrole="https://xbrl.org/2023/arcrole/summation-item" xlink:from="loc_us-gaap_NetCashProvidedByUsedInInvestingActivities_019e932a-f589-72c1-a25e-8c0ff7615d7e" xlink:to="loc_sbcf_AdditionsToBankPremisesAndEquipment_019e932a-f589-77b5-9823-ea591db57af2" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_NetCashProvidedByUsedInFinancingActivities_019e22d7-dc20-7528-af98-519a219eea68" 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_019e22d7-dc20-7cfc-a286-ef8777f35e17" 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_019e22d7-dc20-7528-af98-519a219eea68" xlink:to="loc_us-gaap_RepaymentsOfFederalHomeLoanBankBorrowings_019e22d7-dc20-7cfc-a286-ef8777f35e17" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ProceedsFromStockPlans_019e22d7-dc20-7d63-8b36-75f859318e17" 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_019e22d7-dc20-7528-af98-519a219eea68" xlink:to="loc_us-gaap_ProceedsFromStockPlans_019e22d7-dc20-7d63-8b36-75f859318e17" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PaymentsOfDividendsPreferredStockAndPreferenceStock_019e22d7-dc20-76fe-8307-250574b3b38e" 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_019e22d7-dc20-7528-af98-519a219eea68" xlink:to="loc_us-gaap_PaymentsOfDividendsPreferredStockAndPreferenceStock_019e22d7-dc20-76fe-8307-250574b3b38e" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_IncreaseDecreaseInDeposits_019e22d7-dc20-7da6-926b-0b9941607719" 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_019e22d7-dc20-7528-af98-519a219eea68" xlink:to="loc_us-gaap_IncreaseDecreaseInDeposits_019e22d7-dc20-7da6-926b-0b9941607719" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ProceedsFromFederalHomeLoanBankBorrowings_019e22d7-dc20-712e-b052-fe7931e3006c" 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_019e22d7-dc20-7528-af98-519a219eea68" xlink:to="loc_us-gaap_ProceedsFromFederalHomeLoanBankBorrowings_019e22d7-dc20-712e-b052-fe7931e3006c" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PaymentsForRepurchaseOfCommonStock_019e22d7-dc20-72ca-ba8c-e58f62bb0178" 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_019e22d7-dc20-7528-af98-519a219eea68" xlink:to="loc_us-gaap_PaymentsForRepurchaseOfCommonStock_019e22d7-dc20-72ca-ba8c-e58f62bb0178" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_IncreaseDecreaseInFederalFundsPurchasedAndSecuritiesSoldUnderAgreementsToRepurchaseNet_019e22d7-dc20-7c0d-a822-e5094bce66e9" 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_019e22d7-dc20-7528-af98-519a219eea68" xlink:to="loc_us-gaap_IncreaseDecreaseInFederalFundsPurchasedAndSecuritiesSoldUnderAgreementsToRepurchaseNet_019e22d7-dc20-7c0d-a822-e5094bce66e9" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_IncreaseDecreaseInLoansFromOtherFederalHomeLoanBanks_019e22d7-dc20-7ebf-908b-10b0992659c9" 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_019e22d7-dc20-7528-af98-519a219eea68" xlink:to="loc_us-gaap_IncreaseDecreaseInLoansFromOtherFederalHomeLoanBanks_019e22d7-dc20-7ebf-908b-10b0992659c9" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalentsPeriodIncreaseDecreaseIncludingExchangeRateEffect_019e22d7-dc20-7cf4-9d35-48df94f92f35" 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_019e22d7-dc20-79cb-be03-5e8a98d8891f" 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_019e22d7-dc20-7cf4-9d35-48df94f92f35" xlink:to="loc_us-gaap_NetCashProvidedByUsedInFinancingActivities_019e22d7-dc20-79cb-be03-5e8a98d8891f" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_NetCashProvidedByUsedInOperatingActivities_019e22d7-dc20-77a3-8d55-8a37116cb7e6" 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_019e22d7-dc20-7cf4-9d35-48df94f92f35" xlink:to="loc_us-gaap_NetCashProvidedByUsedInOperatingActivities_019e22d7-dc20-77a3-8d55-8a37116cb7e6" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_NetCashProvidedByUsedInInvestingActivities_019e22d7-dc20-7073-a6ca-3118f1808132" 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_019e22d7-dc20-7cf4-9d35-48df94f92f35" xlink:to="loc_us-gaap_NetCashProvidedByUsedInInvestingActivities_019e22d7-dc20-7073-a6ca-3118f1808132" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_NetCashProvidedByUsedInOperatingActivities_019e22d7-dc20-7ba7-a698-067ca67ac8f8" 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_019e22d7-dc20-7084-960c-fe45366d00a2" 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_019e22d7-dc20-7ba7-a698-067ca67ac8f8" xlink:to="loc_us-gaap_GainLossOnSalesOfConsumerLoans_019e22d7-dc20-7084-960c-fe45366d00a2" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DeferredIncomeTaxExpenseBenefit_019e22d7-dc20-7fcf-bba9-fd31909184a7" 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_019e22d7-dc20-7ba7-a698-067ca67ac8f8" xlink:to="loc_us-gaap_DeferredIncomeTaxExpenseBenefit_019e22d7-dc20-7fcf-bba9-fd31909184a7" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AccretionAmortizationOfDiscountsAndPremiumsInvestments_019e22d7-dc20-76a9-8b43-1d9d4c725918" 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_019e22d7-dc20-7ba7-a698-067ca67ac8f8" xlink:to="loc_us-gaap_AccretionAmortizationOfDiscountsAndPremiumsInvestments_019e22d7-dc20-76a9-8b43-1d9d4c725918" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_GainsLossesOnSalesOfOtherRealEstate_019e22d7-dc20-7956-bc8c-1822290f47b1" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_GainsLossesOnSalesOfOtherRealEstate"/>
    <link:calculationArc order="4" weight="-1.0" xlink:arcrole="https://xbrl.org/2023/arcrole/summation-item" xlink:from="loc_us-gaap_NetCashProvidedByUsedInOperatingActivities_019e22d7-dc20-7ba7-a698-067ca67ac8f8" xlink:to="loc_us-gaap_GainsLossesOnSalesOfOtherRealEstate_019e22d7-dc20-7956-bc8c-1822290f47b1" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_IncreaseDecreaseInOtherOperatingLiabilities_019e22d7-dc20-79fa-8db0-5227b3c9d590" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_IncreaseDecreaseInOtherOperatingLiabilities"/>
    <link:calculationArc order="5" weight="1.0" xlink:arcrole="https://xbrl.org/2023/arcrole/summation-item" xlink:from="loc_us-gaap_NetCashProvidedByUsedInOperatingActivities_019e22d7-dc20-7ba7-a698-067ca67ac8f8" xlink:to="loc_us-gaap_IncreaseDecreaseInOtherOperatingLiabilities_019e22d7-dc20-79fa-8db0-5227b3c9d590" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShareBasedCompensation_019e22d7-dc20-7a1f-8e46-b10cfbb52a38" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_ShareBasedCompensation"/>
    <link:calculationArc order="6" weight="1.0" xlink:arcrole="https://xbrl.org/2023/arcrole/summation-item" xlink:from="loc_us-gaap_NetCashProvidedByUsedInOperatingActivities_019e22d7-dc20-7ba7-a698-067ca67ac8f8" xlink:to="loc_us-gaap_ShareBasedCompensation_019e22d7-dc20-7a1f-8e46-b10cfbb52a38" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_OperatingLeaseRightOfUseAssetAmortizationExpense_019e22d7-dc20-7fc1-a0fe-060b5371ff97" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_OperatingLeaseRightOfUseAssetAmortizationExpense"/>
    <link:calculationArc order="7" weight="1.0" xlink:arcrole="https://xbrl.org/2023/arcrole/summation-item" xlink:from="loc_us-gaap_NetCashProvidedByUsedInOperatingActivities_019e22d7-dc20-7ba7-a698-067ca67ac8f8" xlink:to="loc_us-gaap_OperatingLeaseRightOfUseAssetAmortizationExpense_019e22d7-dc20-7fc1-a0fe-060b5371ff97" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PaymentsForOriginationOfMortgageLoansHeldForSale_019e22d7-dc20-720f-8bb2-407f784a7108" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_PaymentsForOriginationOfMortgageLoansHeldForSale"/>
    <link:calculationArc order="8" weight="-1.0" xlink:arcrole="https://xbrl.org/2023/arcrole/summation-item" xlink:from="loc_us-gaap_NetCashProvidedByUsedInOperatingActivities_019e22d7-dc20-7ba7-a698-067ca67ac8f8" xlink:to="loc_us-gaap_PaymentsForOriginationOfMortgageLoansHeldForSale_019e22d7-dc20-720f-8bb2-407f784a7108" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_sbcf_SaleOfLoansDesignatedHeldForSale_019e22d7-dc20-7be8-9d88-1d5f136e26d5" xlink:href="sbcf-20260630.xsd#sbcf_SaleOfLoansDesignatedHeldForSale"/>
    <link:calculationArc order="9" weight="1.0" xlink:arcrole="https://xbrl.org/2023/arcrole/summation-item" xlink:from="loc_us-gaap_NetCashProvidedByUsedInOperatingActivities_019e22d7-dc20-7ba7-a698-067ca67ac8f8" xlink:to="loc_sbcf_SaleOfLoansDesignatedHeldForSale_019e22d7-dc20-7be8-9d88-1d5f136e26d5" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_NetIncomeLoss_019e22d7-dc20-7666-94ee-4f024dcd04cf" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_NetIncomeLoss"/>
    <link:calculationArc order="10" weight="1.0" xlink:arcrole="https://xbrl.org/2023/arcrole/summation-item" xlink:from="loc_us-gaap_NetCashProvidedByUsedInOperatingActivities_019e22d7-dc20-7ba7-a698-067ca67ac8f8" xlink:to="loc_us-gaap_NetIncomeLoss_019e22d7-dc20-7666-94ee-4f024dcd04cf" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_IncreaseDecreaseInOtherOperatingAssets_019e22d7-dc20-7968-b983-4c4f3746d516" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_IncreaseDecreaseInOtherOperatingAssets"/>
    <link:calculationArc order="11" weight="-1.0" xlink:arcrole="https://xbrl.org/2023/arcrole/summation-item" xlink:from="loc_us-gaap_NetCashProvidedByUsedInOperatingActivities_019e22d7-dc20-7ba7-a698-067ca67ac8f8" xlink:to="loc_us-gaap_IncreaseDecreaseInOtherOperatingAssets_019e22d7-dc20-7968-b983-4c4f3746d516" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_sbcf_FinancingReceivableAndAccruedInterestReceivableCreditLossProvisionReversal_019e22d7-dc20-7538-9e08-ba0baf1acd17" xlink:href="sbcf-20260630.xsd#sbcf_FinancingReceivableAndAccruedInterestReceivableCreditLossProvisionReversal"/>
    <link:calculationArc order="12" weight="1.0" xlink:arcrole="https://xbrl.org/2023/arcrole/summation-item" xlink:from="loc_us-gaap_NetCashProvidedByUsedInOperatingActivities_019e22d7-dc20-7ba7-a698-067ca67ac8f8" xlink:to="loc_sbcf_FinancingReceivableAndAccruedInterestReceivableCreditLossProvisionReversal_019e22d7-dc20-7538-9e08-ba0baf1acd17" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_Depreciation_019e22d7-dc20-7dcf-95ac-69612cb87523" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_Depreciation"/>
    <link:calculationArc order="13" weight="1.0" xlink:arcrole="https://xbrl.org/2023/arcrole/summation-item" xlink:from="loc_us-gaap_NetCashProvidedByUsedInOperatingActivities_019e22d7-dc20-7ba7-a698-067ca67ac8f8" xlink:to="loc_us-gaap_Depreciation_019e22d7-dc20-7dcf-95ac-69612cb87523" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_MarketableSecuritiesGainLossExcludingOtherThanTemporaryImpairments_019e22d7-dc20-765a-9cc4-fbc303e1842b" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_MarketableSecuritiesGainLossExcludingOtherThanTemporaryImpairments"/>
    <link:calculationArc order="14" weight="-1.0" xlink:arcrole="https://xbrl.org/2023/arcrole/summation-item" xlink:from="loc_us-gaap_NetCashProvidedByUsedInOperatingActivities_019e22d7-dc20-7ba7-a698-067ca67ac8f8" xlink:to="loc_us-gaap_MarketableSecuritiesGainLossExcludingOtherThanTemporaryImpairments_019e22d7-dc20-765a-9cc4-fbc303e1842b" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_sbcf_OtherAccretionAmortizationNet_019fc802-9832-7d22-958a-edb5bd9880f3" xlink:href="sbcf-20260630.xsd#sbcf_OtherAccretionAmortizationNet"/>
    <link:calculationArc order="15" weight="-1.0" xlink:arcrole="https://xbrl.org/2023/arcrole/summation-item" xlink:from="loc_us-gaap_NetCashProvidedByUsedInOperatingActivities_019e22d7-dc20-7ba7-a698-067ca67ac8f8" xlink:to="loc_sbcf_OtherAccretionAmortizationNet_019fc802-9832-7d22-958a-edb5bd9880f3" xlink:type="arc"/>
  </link:calculationLink>
  <link:roleRef roleURI="http://www.seacoastbanking.com/role/CONSOLIDATEDSTATEMENTSOFCONVERTIBLEPREFERREDSTOCKANDSHAREHOLDERSEQUITYUnaudited" xlink:type="simple" xlink:href="sbcf-20260630.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_019e22d7-dc20-76fe-b344-6af97f8c0011" 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_019e22d7-dc20-7b79-992e-76aa6cdc047c" 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_019e22d7-dc20-76fe-b344-6af97f8c0011" xlink:to="loc_us-gaap_StockIssuedDuringPeriodSharesEmployeeBenefitPlan_019e22d7-dc20-7b79-992e-76aa6cdc047c" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_TreasuryStockSharesAcquired_019e22d7-dc20-7c7f-a728-862712e26f68" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_TreasuryStockSharesAcquired"/>
    <link:calculationArc order="2" weight="-1.0" xlink:arcrole="https://xbrl.org/2023/arcrole/summation-item" xlink:from="loc_us-gaap_StockIssuedDuringPeriodSharesPeriodIncreaseDecrease_019e22d7-dc20-76fe-b344-6af97f8c0011" xlink:to="loc_us-gaap_TreasuryStockSharesAcquired_019e22d7-dc20-7c7f-a728-862712e26f68" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_sbcf_StockIssuedDuringPeriodSharesCommonStockTransactionsRelatedToEmployeeBenefitPlans_019fa3f7-661a-729b-a17a-676dbc6442de" xlink:href="sbcf-20260630.xsd#sbcf_StockIssuedDuringPeriodSharesCommonStockTransactionsRelatedToEmployeeBenefitPlans"/>
    <link:calculationArc order="3" weight="1.0" xlink:arcrole="https://xbrl.org/2023/arcrole/summation-item" xlink:from="loc_us-gaap_StockIssuedDuringPeriodSharesPeriodIncreaseDecrease_019e22d7-dc20-76fe-b344-6af97f8c0011" xlink:to="loc_sbcf_StockIssuedDuringPeriodSharesCommonStockTransactionsRelatedToEmployeeBenefitPlans_019fa3f7-661a-729b-a17a-676dbc6442de" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_StockholdersEquityPeriodIncreaseDecrease_019e22d7-dc20-7cb5-93af-503a063f58af" 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_019e22d7-dc20-7701-887a-8d9b1dfbc8e8" 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_019e22d7-dc20-7cb5-93af-503a063f58af" xlink:to="loc_us-gaap_AdjustmentsToAdditionalPaidInCapitalSharebasedCompensationRequisiteServicePeriodRecognitionValue_019e22d7-dc20-7701-887a-8d9b1dfbc8e8" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_sbcf_StockIssuedDuringPeriodValueCommonStockTransactionsRelatedToEmployeeBenefitPlans_019e22d7-dc20-70bc-b97e-a66da68ab0cd" xlink:href="sbcf-20260630.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_019e22d7-dc20-7cb5-93af-503a063f58af" xlink:to="loc_sbcf_StockIssuedDuringPeriodValueCommonStockTransactionsRelatedToEmployeeBenefitPlans_019e22d7-dc20-70bc-b97e-a66da68ab0cd" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ComprehensiveIncomeNetOfTax_019e22d7-dc20-726b-a060-0b1599bc486b" 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_019e22d7-dc20-7cb5-93af-503a063f58af" xlink:to="loc_us-gaap_ComprehensiveIncomeNetOfTax_019e22d7-dc20-726b-a060-0b1599bc486b" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DividendsCommonStock_019e22d7-dc20-7a2f-8840-1c23de5c8d4b" 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_019e22d7-dc20-7cb5-93af-503a063f58af" xlink:to="loc_us-gaap_DividendsCommonStock_019e22d7-dc20-7a2f-8840-1c23de5c8d4b" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DividendsPreferredStock_019e22d7-dc20-798b-96b1-73502d83c370" 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_019e22d7-dc20-7cb5-93af-503a063f58af" xlink:to="loc_us-gaap_DividendsPreferredStock_019e22d7-dc20-798b-96b1-73502d83c370" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_TreasuryStockValueAcquiredCostMethod_019e5e23-573c-7b55-9a5f-e0c9f1aa5e56" 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_019e22d7-dc20-7cb5-93af-503a063f58af" xlink:to="loc_us-gaap_TreasuryStockValueAcquiredCostMethod_019e5e23-573c-7b55-9a5f-e0c9f1aa5e56" xlink:type="arc"/>
  </link:calculationLink>
  <link:roleRef roleURI="http://www.seacoastbanking.com/role/EarningsperShareScheduleofEarningsPerShareBasicandDilutedDetails" xlink:type="simple" xlink:href="sbcf-20260630.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_019e3999-44ca-7f66-ba11-937908db83ca" 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_019e3999-44ca-71a8-a31b-e83e7a3a0901" xlink:href="sbcf-20260630.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_019e3999-44ca-7f66-ba11-937908db83ca" xlink:to="loc_sbcf_NetIncomeLossAvailableToCommonStockholdersBeforeEarningsLossAllocatedToParticipatingSecurities_019e3999-44ca-71a8-a31b-e83e7a3a0901" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_UndistributedEarningsLossAllocatedToParticipatingSecuritiesBasic_019e3999-44ca-7c21-a234-0d55579f7ff3" 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_019e3999-44ca-7f66-ba11-937908db83ca" xlink:to="loc_us-gaap_UndistributedEarningsLossAllocatedToParticipatingSecuritiesBasic_019e3999-44ca-7c21-a234-0d55579f7ff3" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_NetIncomeLossAvailableToCommonStockholdersDiluted_019e399a-b400-781e-b9a9-843f425a7c70" 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_019e399a-b400-7393-a8e3-86258c4a10da" xlink:href="sbcf-20260630.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_019e399a-b400-781e-b9a9-843f425a7c70" xlink:to="loc_sbcf_NetIncomeLossAvailableToCommonStockholdersBeforeEarningsLossAllocatedToParticipatingSecurities_019e399a-b400-7393-a8e3-86258c4a10da" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_UndistributedEarningsLossAllocatedToParticipatingSecuritiesDiluted_019e399a-b400-7f93-b287-366e4ba566ca" 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_019e399a-b400-781e-b9a9-843f425a7c70" xlink:to="loc_us-gaap_UndistributedEarningsLossAllocatedToParticipatingSecuritiesDiluted_019e399a-b400-7f93-b287-366e4ba566ca" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding_019e5e2d-d61c-7c3d-8e54-971e7a07fe2c" 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_019e5e2d-d61c-71a9-bdf5-023ccb8d81b5" 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_019e5e2d-d61c-7c3d-8e54-971e7a07fe2c" xlink:to="loc_us-gaap_WeightedAverageNumberOfSharesOutstandingBasic_019e5e2d-d61c-71a9-bdf5-023ccb8d81b5" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_WeightedAverageNumberDilutedSharesOutstandingAdjustment_019e5e2d-d61c-78ad-8b04-cfd09d1bfe1d" 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_019e5e2d-d61c-7c3d-8e54-971e7a07fe2c" xlink:to="loc_us-gaap_WeightedAverageNumberDilutedSharesOutstandingAdjustment_019e5e2d-d61c-78ad-8b04-cfd09d1bfe1d" xlink:type="arc"/>
  </link:calculationLink>
  <link:roleRef roleURI="http://www.seacoastbanking.com/role/SecuritiesScheduleofAmortizedCostandFairValueofSecuritiesAvailableforSaleandHeldforInvestmentDetails" xlink:type="simple" xlink:href="sbcf-20260630.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_DebtSecuritiesAvailableForSaleAmortizedCostExcludingAccruedInterestAfterAllowanceForCreditLoss_019e22d7-dcd1-71bf-88ca-64a1c1473719" 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_019e22d7-dcd1-7a66-9b9c-bad896c5a2c9" 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_019e22d7-dcd1-71bf-88ca-64a1c1473719" xlink:to="loc_us-gaap_AvailableForSaleDebtSecuritiesAccumulatedGrossUnrealizedGainBeforeTax_019e22d7-dcd1-7a66-9b9c-bad896c5a2c9" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AvailableForSaleDebtSecuritiesAccumulatedGrossUnrealizedLossBeforeTax_019e22d7-dcd1-7308-82de-4960ea4eb94d" 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_019e22d7-dcd1-71bf-88ca-64a1c1473719" xlink:to="loc_us-gaap_AvailableForSaleDebtSecuritiesAccumulatedGrossUnrealizedLossBeforeTax_019e22d7-dcd1-7308-82de-4960ea4eb94d" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtSecuritiesAvailableForSaleExcludingAccruedInterest_019e22d7-dcd1-7f67-9cfa-359396bb534c" 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_019e22d7-dcd1-71bf-88ca-64a1c1473719" xlink:to="loc_us-gaap_DebtSecuritiesAvailableForSaleExcludingAccruedInterest_019e22d7-dcd1-7f67-9cfa-359396bb534c" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtSecuritiesHeldToMaturityExcludingAccruedInterestAfterAllowanceForCreditLoss_019e22d7-dcd1-740a-a956-54ed8b878c79" 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_019e22d7-dcd1-7f4d-8939-6f0a7c46575d" 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_019e22d7-dcd1-740a-a956-54ed8b878c79" xlink:to="loc_us-gaap_HeldToMaturitySecuritiesAccumulatedUnrecognizedHoldingGain_019e22d7-dcd1-7f4d-8939-6f0a7c46575d" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_HeldToMaturitySecuritiesAccumulatedUnrecognizedHoldingLoss_019e22d7-dcd1-7a1e-a730-8671ee2b6ee4" 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_019e22d7-dcd1-740a-a956-54ed8b878c79" xlink:to="loc_us-gaap_HeldToMaturitySecuritiesAccumulatedUnrecognizedHoldingLoss_019e22d7-dcd1-7a1e-a730-8671ee2b6ee4" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_HeldToMaturitySecuritiesFairValue_019e22d7-dcd1-7249-96f1-2f0474c5dd5d" 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_019e22d7-dcd1-740a-a956-54ed8b878c79" xlink:to="loc_us-gaap_HeldToMaturitySecuritiesFairValue_019e22d7-dcd1-7249-96f1-2f0474c5dd5d" xlink:type="arc"/>
  </link:calculationLink>
  <link:roleRef roleURI="http://www.seacoastbanking.com/role/SecuritiesScheduleofAmortizedCostandFairValueofSecuritiesbyContractualMaturityDetails" xlink:type="simple" xlink:href="sbcf-20260630.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_AvailableForSaleSecuritiesDebtMaturitiesSingleMaturityDate_019e22d7-dcd1-7686-b3ab-4327e73f53a9" 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_019e22d7-dcd1-7b17-8272-5f31a5f59468" 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_019e22d7-dcd1-7686-b3ab-4327e73f53a9" xlink:to="loc_us-gaap_AvailableForSaleSecuritiesDebtMaturitiesWithinOneYearFairValue_019e22d7-dcd1-7b17-8272-5f31a5f59468" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AvailableForSaleSecuritiesDebtMaturitiesAfterOneThroughFiveYearsFairValue_019e22d7-dcd1-7113-908e-743989c4cac5" 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_019e22d7-dcd1-7686-b3ab-4327e73f53a9" xlink:to="loc_us-gaap_AvailableForSaleSecuritiesDebtMaturitiesAfterOneThroughFiveYearsFairValue_019e22d7-dcd1-7113-908e-743989c4cac5" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AvailableForSaleSecuritiesDebtMaturitiesAfterFiveThroughTenYearsFairValue_019e22d7-dcd1-73f2-92f8-8fc976f62a7c" 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_019e22d7-dcd1-7686-b3ab-4327e73f53a9" xlink:to="loc_us-gaap_AvailableForSaleSecuritiesDebtMaturitiesAfterFiveThroughTenYearsFairValue_019e22d7-dcd1-73f2-92f8-8fc976f62a7c" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AvailableForSaleSecuritiesDebtMaturitiesAfterTenYearsFairValue_019e22d7-dcd1-7f37-bb6a-99eefbe0bb99" 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_019e22d7-dcd1-7686-b3ab-4327e73f53a9" xlink:to="loc_us-gaap_AvailableForSaleSecuritiesDebtMaturitiesAfterTenYearsFairValue_019e22d7-dcd1-7f37-bb6a-99eefbe0bb99" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtSecuritiesHeldToMaturityAmortizedCostExcludingAccruedInterestAfterAllowanceForCreditLossMaturityAllocatedAndSingleMaturityDate_019e22d7-dcd1-7912-9890-a224410fbbe7" 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_019e22d7-dcd1-7a87-b926-43eef7bbc5a1" 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_019e22d7-dcd1-7912-9890-a224410fbbe7" xlink:to="loc_us-gaap_DebtSecuritiesHeldToMaturityAmortizedCostExcludingAccruedInterestAfterAllowanceForCreditLossMaturityAllocatedAndSingleMaturityDateAfterYearOneThroughFive_019e22d7-dcd1-7a87-b926-43eef7bbc5a1" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtSecuritiesHeldToMaturityAmortizedCostExcludingAccruedInterestAfterAllowanceForCreditLossMaturityAllocatedAndSingleMaturityDateYearOne_019e22d7-dcd1-7d1d-9db6-a91017c21296" 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_019e22d7-dcd1-7912-9890-a224410fbbe7" xlink:to="loc_us-gaap_DebtSecuritiesHeldToMaturityAmortizedCostExcludingAccruedInterestAfterAllowanceForCreditLossMaturityAllocatedAndSingleMaturityDateYearOne_019e22d7-dcd1-7d1d-9db6-a91017c21296" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtSecuritiesHeldToMaturityAmortizedCostExcludingAccruedInterestAfterAllowanceForCreditLossMaturityAllocatedAndSingleMaturityDateAfterYear10_019e22d7-dcd1-7334-b785-8c1cd2b6bb22" 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_019e22d7-dcd1-7912-9890-a224410fbbe7" xlink:to="loc_us-gaap_DebtSecuritiesHeldToMaturityAmortizedCostExcludingAccruedInterestAfterAllowanceForCreditLossMaturityAllocatedAndSingleMaturityDateAfterYear10_019e22d7-dcd1-7334-b785-8c1cd2b6bb22" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtSecuritiesHeldToMaturityAmortizedCostExcludingAccruedInterestAfterAllowanceForCreditLossMaturityAllocatedAndSingleMaturityDateAfterYear5Through10_019e22d7-dcd1-7381-878c-b80a7829dd33" 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_019e22d7-dcd1-7912-9890-a224410fbbe7" xlink:to="loc_us-gaap_DebtSecuritiesHeldToMaturityAmortizedCostExcludingAccruedInterestAfterAllowanceForCreditLossMaturityAllocatedAndSingleMaturityDateAfterYear5Through10_019e22d7-dcd1-7381-878c-b80a7829dd33" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtSecuritiesAvailableForSaleExcludingAccruedInterest_019e22d7-dcd1-7268-99b9-906fa5a13d6e" 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_019e22d7-dcd1-759f-9b91-ea1c24cba812" 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_019e22d7-dcd1-7268-99b9-906fa5a13d6e" xlink:to="loc_us-gaap_AvailableForSaleSecuritiesDebtMaturitiesSingleMaturityDate_019e22d7-dcd1-759f-9b91-ea1c24cba812" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AvailableForSaleSecuritiesDebtMaturitiesWithoutSingleMaturityDateFairValue_019e22d7-dcd1-7456-a877-415d978edafa" 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_019e22d7-dcd1-7268-99b9-906fa5a13d6e" xlink:to="loc_us-gaap_AvailableForSaleSecuritiesDebtMaturitiesWithoutSingleMaturityDateFairValue_019e22d7-dcd1-7456-a877-415d978edafa" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtSecuritiesHeldToMaturityExcludingAccruedInterestAfterAllowanceForCreditLoss_019e22d7-dcd1-7a3a-bcbc-0972faab1c01" 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_019e22d7-dcd1-7ad4-9982-3db8a9d63610" 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_019e22d7-dcd1-7a3a-bcbc-0972faab1c01" xlink:to="loc_us-gaap_DebtSecuritiesHeldToMaturityAmortizedCostExcludingAccruedInterestAfterAllowanceForCreditLossMaturityWithoutSingleMaturityDate_019e22d7-dcd1-7ad4-9982-3db8a9d63610" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtSecuritiesHeldToMaturityAmortizedCostExcludingAccruedInterestAfterAllowanceForCreditLossMaturityAllocatedAndSingleMaturityDate_019e22d7-dcd1-7e76-87ed-1843f6e145c6" 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_019e22d7-dcd1-7a3a-bcbc-0972faab1c01" xlink:to="loc_us-gaap_DebtSecuritiesHeldToMaturityAmortizedCostExcludingAccruedInterestAfterAllowanceForCreditLossMaturityAllocatedAndSingleMaturityDate_019e22d7-dcd1-7e76-87ed-1843f6e145c6" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtSecuritiesAvailableForSaleAmortizedCostExcludingAccruedInterestAfterAllowanceForCreditLoss_019e22d7-dcd1-7870-bd2c-b95be1a928e0" 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_019e22d7-dcd1-7eea-bd21-381593818cdc" 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_019e22d7-dcd1-7870-bd2c-b95be1a928e0" xlink:to="loc_us-gaap_AvailableForSaleSecuritiesDebtMaturitiesSingleMaturityDateAmortizedCostBasis_019e22d7-dcd1-7eea-bd21-381593818cdc" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AvailableForSaleSecuritiesDebtMaturitiesWithoutSingleMaturityDateAmortizedCost_019e22d7-dcd1-7f2d-bcf8-681c54aeaf87" 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_019e22d7-dcd1-7870-bd2c-b95be1a928e0" xlink:to="loc_us-gaap_AvailableForSaleSecuritiesDebtMaturitiesWithoutSingleMaturityDateAmortizedCost_019e22d7-dcd1-7f2d-bcf8-681c54aeaf87" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_HeldToMaturitySecuritiesDebtMaturitiesSingleMaturityDateFairValue_019e22d7-dcd1-786c-8572-f1f4a4f59755" 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_019e22d7-dcd1-7200-bc4b-5785a430568e" 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_019e22d7-dcd1-786c-8572-f1f4a4f59755" xlink:to="loc_us-gaap_HeldToMaturitySecuritiesDebtMaturitiesWithinOneYearFairValue_019e22d7-dcd1-7200-bc4b-5785a430568e" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_HeldToMaturitySecuritiesDebtMaturitiesAfterOneThroughFiveYearsFairValue_019e22d7-dcd1-7582-975b-9823d2c46b7d" 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_019e22d7-dcd1-786c-8572-f1f4a4f59755" xlink:to="loc_us-gaap_HeldToMaturitySecuritiesDebtMaturitiesAfterOneThroughFiveYearsFairValue_019e22d7-dcd1-7582-975b-9823d2c46b7d" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_HeldToMaturitySecuritiesDebtMaturitiesAfterFiveThroughTenYearsFairValue_019e22d7-dcd1-7537-afa7-0076b7a153c9" 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_019e22d7-dcd1-786c-8572-f1f4a4f59755" xlink:to="loc_us-gaap_HeldToMaturitySecuritiesDebtMaturitiesAfterFiveThroughTenYearsFairValue_019e22d7-dcd1-7537-afa7-0076b7a153c9" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_HeldToMaturitySecuritiesDebtMaturitiesAfterTenYearsFairValue_019e22d7-dcd1-7592-81ce-669c3a7b2c9d" 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_019e22d7-dcd1-786c-8572-f1f4a4f59755" xlink:to="loc_us-gaap_HeldToMaturitySecuritiesDebtMaturitiesAfterTenYearsFairValue_019e22d7-dcd1-7592-81ce-669c3a7b2c9d" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AvailableForSaleSecuritiesDebtMaturitiesSingleMaturityDateAmortizedCostBasis_019e22d7-dcd1-78c6-9c73-0481491a2be8" 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_019e22d7-dcd1-7f79-945d-08bc36b6cab3" 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_019e22d7-dcd1-78c6-9c73-0481491a2be8" xlink:to="loc_us-gaap_AvailableForSaleSecuritiesDebtMaturitiesWithinOneYearAmortizedCost_019e22d7-dcd1-7f79-945d-08bc36b6cab3" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AvailableForSaleSecuritiesDebtMaturitiesAfterOneThroughFiveYearsAmortizedCost_019e22d7-dcd1-7c37-ab71-5ec649dd30ab" 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_019e22d7-dcd1-78c6-9c73-0481491a2be8" xlink:to="loc_us-gaap_AvailableForSaleSecuritiesDebtMaturitiesAfterOneThroughFiveYearsAmortizedCost_019e22d7-dcd1-7c37-ab71-5ec649dd30ab" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AvailableForSaleSecuritiesDebtMaturitiesAfterFiveThroughTenYearsAmortizedCost_019e22d7-dcd1-7676-b8bf-8bb8b576902c" 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_019e22d7-dcd1-78c6-9c73-0481491a2be8" xlink:to="loc_us-gaap_AvailableForSaleSecuritiesDebtMaturitiesAfterFiveThroughTenYearsAmortizedCost_019e22d7-dcd1-7676-b8bf-8bb8b576902c" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AvailableForSaleSecuritiesDebtMaturitiesRollingAfterYearTenAmortizedCostBasis_019e22d7-dcd1-72c5-9894-db2ad4a23b2a" 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_019e22d7-dcd1-78c6-9c73-0481491a2be8" xlink:to="loc_us-gaap_AvailableForSaleSecuritiesDebtMaturitiesRollingAfterYearTenAmortizedCostBasis_019e22d7-dcd1-72c5-9894-db2ad4a23b2a" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_HeldToMaturitySecuritiesFairValue_019e22d7-dcd1-7da8-bff9-a6f1dea4da3d" 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_019e22d7-dcd1-764e-a2b5-9dfbdc13781c" 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_019e22d7-dcd1-7da8-bff9-a6f1dea4da3d" xlink:to="loc_us-gaap_HeldToMaturitySecuritiesDebtMaturitiesWithoutSingleMaturityDateFairValue_019e22d7-dcd1-764e-a2b5-9dfbdc13781c" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_HeldToMaturitySecuritiesDebtMaturitiesSingleMaturityDateFairValue_019e22d7-dcd1-716e-91c0-d28ed05899e6" 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_019e22d7-dcd1-7da8-bff9-a6f1dea4da3d" xlink:to="loc_us-gaap_HeldToMaturitySecuritiesDebtMaturitiesSingleMaturityDateFairValue_019e22d7-dcd1-716e-91c0-d28ed05899e6" xlink:type="arc"/>
  </link:calculationLink>
  <link:roleRef roleURI="http://www.seacoastbanking.com/role/SecuritiesScheduleofUnrealizedLossandFairValueonInvestmentsDetails" xlink:type="simple" xlink:href="sbcf-20260630.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_DebtSecuritiesAvailableForSaleUnrealizedLossPosition_019e22d7-dcd1-7eb4-b4ea-6b96d48af86d" 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_019e22d7-dcd1-7650-ad6f-adf7fad9e0d2" 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_019e22d7-dcd1-7eb4-b4ea-6b96d48af86d" xlink:to="loc_us-gaap_DebtSecuritiesAvailableForSaleContinuousUnrealizedLossPositionLessThan12Months_019e22d7-dcd1-7650-ad6f-adf7fad9e0d2" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtSecuritiesAvailableForSaleContinuousUnrealizedLossPosition12MonthsOrLonger_019e22d7-dcd1-7702-8679-6684b6f0f7e7" 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_019e22d7-dcd1-7eb4-b4ea-6b96d48af86d" xlink:to="loc_us-gaap_DebtSecuritiesAvailableForSaleContinuousUnrealizedLossPosition12MonthsOrLonger_019e22d7-dcd1-7702-8679-6684b6f0f7e7" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtSecuritiesAvailableForSaleUnrealizedLossPositionAccumulatedLoss_019e22d7-dcd1-7d33-9552-bbe23b161f21" 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_019e22d7-dcd1-771f-8c5a-f46e6468f03f" 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_019e22d7-dcd1-7d33-9552-bbe23b161f21" xlink:to="loc_us-gaap_DebtSecuritiesAvailableForSaleContinuousUnrealizedLossPositionLessThan12MonthsAccumulatedLoss_019e22d7-dcd1-771f-8c5a-f46e6468f03f" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtSecuritiesAvailableForSaleContinuousUnrealizedLossPosition12MonthsOrLongerAccumulatedLoss_019e22d7-dcd1-77e9-bb30-c9c7a7071357" 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_019e22d7-dcd1-7d33-9552-bbe23b161f21" xlink:to="loc_us-gaap_DebtSecuritiesAvailableForSaleContinuousUnrealizedLossPosition12MonthsOrLongerAccumulatedLoss_019e22d7-dcd1-77e9-bb30-c9c7a7071357" xlink:type="arc"/>
  </link:calculationLink>
  <link:roleRef roleURI="http://www.seacoastbanking.com/role/LoansScheduleofNonaccrualLoansbyLoanCategoryDetails" xlink:type="simple" xlink:href="sbcf-20260630.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_019e22d7-dcd1-7114-bf8d-52d19e95f38a" 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_019e22d7-dcd1-7922-8983-9778de1ec379" 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_019e22d7-dcd1-7114-bf8d-52d19e95f38a" xlink:to="loc_us-gaap_FinancingReceivableExcludingAccruedInterestNonaccrualNoAllowance_019e22d7-dcd1-7922-8983-9778de1ec379" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_sbcf_FinancingReceivableExcludingAccruedInterestNonaccrualWithAllowanceForCreditLosses_019e22d7-dcd1-7755-a3bb-49545af6808c" xlink:href="sbcf-20260630.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_019e22d7-dcd1-7114-bf8d-52d19e95f38a" xlink:to="loc_sbcf_FinancingReceivableExcludingAccruedInterestNonaccrualWithAllowanceForCreditLosses_019e22d7-dcd1-7755-a3bb-49545af6808c" xlink:type="arc"/>
  </link:calculationLink>
  <link:roleRef roleURI="http://www.seacoastbanking.com/role/LoansScheduleofRiskCategoriesofLoansbyClassofLoansDetails" xlink:type="simple" xlink:href="sbcf-20260630.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_FinancingReceivableExcludingAccruedInterestBeforeAllowanceForCreditLoss_019e22d7-dcd1-72de-97c6-812d6fddf808" 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_019e22d7-dcd1-7c26-af0f-54d000469671" 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_019e22d7-dcd1-72de-97c6-812d6fddf808" xlink:to="loc_us-gaap_FinancingReceivableExcludingAccruedInterestYearTwoOriginatedFiscalYearBeforeCurrentFiscalYear_019e22d7-dcd1-7c26-af0f-54d000469671" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FinancingReceivableExcludingAccruedInterestYearOneOriginatedCurrentFiscalYear_019e22d7-dcd1-7de0-a7fb-8cc151ac113c" 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_019e22d7-dcd1-72de-97c6-812d6fddf808" xlink:to="loc_us-gaap_FinancingReceivableExcludingAccruedInterestYearOneOriginatedCurrentFiscalYear_019e22d7-dcd1-7de0-a7fb-8cc151ac113c" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FinancingReceivableExcludingAccruedInterestYearThreeOriginatedTwoYearsBeforeCurrentFiscalYear_019e22d7-dcd1-7836-b69f-7af10829a6b8" 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_019e22d7-dcd1-72de-97c6-812d6fddf808" xlink:to="loc_us-gaap_FinancingReceivableExcludingAccruedInterestYearThreeOriginatedTwoYearsBeforeCurrentFiscalYear_019e22d7-dcd1-7836-b69f-7af10829a6b8" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FinancingReceivableExcludingAccruedInterestYearFiveOriginatedFourYearsBeforeCurrentFiscalYear_019e22d7-dcd1-718c-8496-53939c2d6028" 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_019e22d7-dcd1-72de-97c6-812d6fddf808" xlink:to="loc_us-gaap_FinancingReceivableExcludingAccruedInterestYearFiveOriginatedFourYearsBeforeCurrentFiscalYear_019e22d7-dcd1-718c-8496-53939c2d6028" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FinancingReceivableExcludingAccruedInterestOriginatedMoreThanFiveYearsBeforeCurrentFiscalYear_019e22d7-dcd1-7073-a9e8-a638b279268d" 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_019e22d7-dcd1-72de-97c6-812d6fddf808" xlink:to="loc_us-gaap_FinancingReceivableExcludingAccruedInterestOriginatedMoreThanFiveYearsBeforeCurrentFiscalYear_019e22d7-dcd1-7073-a9e8-a638b279268d" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FinancingReceivableExcludingAccruedInterestRevolving_019e22d7-dcd1-7b0b-9a15-561e6a5e2777" 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_019e22d7-dcd1-72de-97c6-812d6fddf808" xlink:to="loc_us-gaap_FinancingReceivableExcludingAccruedInterestRevolving_019e22d7-dcd1-7b0b-9a15-561e6a5e2777" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FinancingReceivableExcludingAccruedInterestYearFourOriginatedThreeYearsBeforeCurrentFiscalYear_019e22d7-dcd1-7c1e-a261-5888a41c92d1" 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_019e22d7-dcd1-72de-97c6-812d6fddf808" xlink:to="loc_us-gaap_FinancingReceivableExcludingAccruedInterestYearFourOriginatedThreeYearsBeforeCurrentFiscalYear_019e22d7-dcd1-7c1e-a261-5888a41c92d1" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FinancingReceivableExcludingAccruedInterestRevolvingConvertedToTermLoan_019e22d7-dcd1-72e1-a91e-793e55181f1f" 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_019e22d7-dcd1-72de-97c6-812d6fddf808" xlink:to="loc_us-gaap_FinancingReceivableExcludingAccruedInterestRevolvingConvertedToTermLoan_019e22d7-dcd1-72e1-a91e-793e55181f1f" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FinancingReceivableExcludingAccruedInterestAllowanceForCreditLossWriteoff_019e22d7-dcd1-7633-b11e-b9703270c4da" 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_019e22d7-dcd1-716f-aad0-f91da17a5134" 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_019e22d7-dcd1-7633-b11e-b9703270c4da" xlink:to="loc_us-gaap_FinancingReceivableExcludingAccruedInterestYearOneOriginatedCurrentFiscalYearWriteoff_019e22d7-dcd1-716f-aad0-f91da17a5134" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FinancingReceivableExcludingAccruedInterestYearTwoOriginatedFiscalYearBeforeCurrentFiscalYearWriteoff_019e22d7-dcd1-79bd-9036-086ecb48550a" 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_019e22d7-dcd1-7633-b11e-b9703270c4da" xlink:to="loc_us-gaap_FinancingReceivableExcludingAccruedInterestYearTwoOriginatedFiscalYearBeforeCurrentFiscalYearWriteoff_019e22d7-dcd1-79bd-9036-086ecb48550a" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FinancingReceivableExcludingAccruedInterestYearThreeOriginatedTwoYearsBeforeCurrentFiscalYearWriteoff_019e22d7-dcd1-7ecf-ada0-dcd8ac5b4343" 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_019e22d7-dcd1-7633-b11e-b9703270c4da" xlink:to="loc_us-gaap_FinancingReceivableExcludingAccruedInterestYearThreeOriginatedTwoYearsBeforeCurrentFiscalYearWriteoff_019e22d7-dcd1-7ecf-ada0-dcd8ac5b4343" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FinancingReceivableExcludingAccruedInterestYearFourOriginatedThreeYearsBeforeCurrentFiscalYearWriteoff_019e22d7-dcd1-7c4d-9fe3-921dab6422ae" 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_019e22d7-dcd1-7633-b11e-b9703270c4da" xlink:to="loc_us-gaap_FinancingReceivableExcludingAccruedInterestYearFourOriginatedThreeYearsBeforeCurrentFiscalYearWriteoff_019e22d7-dcd1-7c4d-9fe3-921dab6422ae" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FinancingReceivableExcludingAccruedInterestYearFiveOriginatedFourYearsBeforeCurrentFiscalYearWriteoff_019e22d7-dcd1-722d-8802-3e9f440ad90f" 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_019e22d7-dcd1-7633-b11e-b9703270c4da" xlink:to="loc_us-gaap_FinancingReceivableExcludingAccruedInterestYearFiveOriginatedFourYearsBeforeCurrentFiscalYearWriteoff_019e22d7-dcd1-722d-8802-3e9f440ad90f" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FinancingReceivableExcludingAccruedInterestOriginatedMoreThanFiveYearsBeforeCurrentFiscalYearWriteoff_019e22d7-dcd1-7645-9e01-c523cb36cb2d" 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_019e22d7-dcd1-7633-b11e-b9703270c4da" xlink:to="loc_us-gaap_FinancingReceivableExcludingAccruedInterestOriginatedMoreThanFiveYearsBeforeCurrentFiscalYearWriteoff_019e22d7-dcd1-7645-9e01-c523cb36cb2d" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FinancingReceivableExcludingAccruedInterestRevolvingWriteoff_019e22d7-dcd1-7deb-8db7-0db62c8e8854" 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_019e22d7-dcd1-7633-b11e-b9703270c4da" xlink:to="loc_us-gaap_FinancingReceivableExcludingAccruedInterestRevolvingWriteoff_019e22d7-dcd1-7deb-8db7-0db62c8e8854" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FinancingReceivableExcludingAccruedInterestRevolvingConvertedToTermLoanWriteoff_019e22d7-dcd1-7c9e-8b16-d16361649712" 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_019e22d7-dcd1-7633-b11e-b9703270c4da" xlink:to="loc_us-gaap_FinancingReceivableExcludingAccruedInterestRevolvingConvertedToTermLoanWriteoff_019e22d7-dcd1-7c9e-8b16-d16361649712" xlink:type="arc"/>
  </link:calculationLink>
  <link:roleRef roleURI="http://www.seacoastbanking.com/role/BusinessCombinationsScheduleofPurchasePriceDetails" xlink:type="simple" xlink:href="sbcf-20260630.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_019e22d7-dcd1-7f90-a1a1-b9daaf8e9c0b" 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_019e22d7-dcd1-7280-98d0-7e9f2fd6333e" 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_019e22d7-dcd1-7f90-a1a1-b9daaf8e9c0b" xlink:to="loc_us-gaap_BusinessCombinationConsiderationTransferredEquityInterestsIssuedAndIssuable_019e22d7-dcd1-7280-98d0-7e9f2fd6333e" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PaymentsToAcquireBusinessesGross_019e22d7-dcd1-7022-affd-4ab59b8b550e" 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_019e22d7-dcd1-7f90-a1a1-b9daaf8e9c0b" xlink:to="loc_us-gaap_PaymentsToAcquireBusinessesGross_019e22d7-dcd1-7022-affd-4ab59b8b550e" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_sbcf_PaymentsToAcquireBusinessesOptionHolders_019e22d7-dcd1-7df8-882e-c85bacc43c7b" xlink:href="sbcf-20260630.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_019e22d7-dcd1-7f90-a1a1-b9daaf8e9c0b" xlink:to="loc_sbcf_PaymentsToAcquireBusinessesOptionHolders_019e22d7-dcd1-7df8-882e-c85bacc43c7b" xlink:type="arc"/>
  </link:calculationLink>
  <link:roleRef roleURI="http://www.seacoastbanking.com/role/BusinessCombinationsScheduleofFairValueofAssetsAcquiredandLiabilitiesAssumedDetails" xlink:type="simple" xlink:href="sbcf-20260630.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_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedAssets_019e3e32-9d86-75d1-95b9-6e63b2fdb29d" 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_019e3e32-9d86-7c90-baf5-6c73246b7754" 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_019e3e32-9d86-75d1-95b9-6e63b2fdb29d" xlink:to="loc_us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedCashAndEquivalents_019e3e32-9d86-7c90-baf5-6c73246b7754" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_sbcf_BusinessCombinationRecognizedAssetAcquiredInvestmentSecurities_019e3e32-9d86-7e60-a0db-410c97604c6c" xlink:href="sbcf-20260630.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_019e3e32-9d86-75d1-95b9-6e63b2fdb29d" xlink:to="loc_sbcf_BusinessCombinationRecognizedAssetAcquiredInvestmentSecurities_019e3e32-9d86-7e60-a0db-410c97604c6c" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_sbcf_BusinessCombinationRecognizedAssetAcquiredFinancingReceivableExcludingAccruedInterestAfterAllowanceForCreditLoss_019e3e32-9d86-71e0-8046-96be59551d28" xlink:href="sbcf-20260630.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_019e3e32-9d86-75d1-95b9-6e63b2fdb29d" xlink:to="loc_sbcf_BusinessCombinationRecognizedAssetAcquiredFinancingReceivableExcludingAccruedInterestAfterAllowanceForCreditLoss_019e3e32-9d86-71e0-8046-96be59551d28" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedPropertyPlantAndEquipment_019e3e32-9d86-7ec4-b6ef-3dbe0ecef6c8" 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_019e3e32-9d86-75d1-95b9-6e63b2fdb29d" xlink:to="loc_us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedPropertyPlantAndEquipment_019e3e32-9d86-7ec4-b6ef-3dbe0ecef6c8" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedIntangibles_019e3e32-9d86-70fb-b2b8-b230773fe929" 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_019e3e32-9d86-75d1-95b9-6e63b2fdb29d" xlink:to="loc_us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedIntangibles_019e3e32-9d86-70fb-b2b8-b230773fe929" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_Goodwill_019e3e32-9d86-7cc3-bb5b-a911cfd3a5d7" 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_019e3e32-9d86-75d1-95b9-6e63b2fdb29d" xlink:to="loc_us-gaap_Goodwill_019e3e32-9d86-7cc3-bb5b-a911cfd3a5d7" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedOtherNoncurrentAssets_019e3e32-9d86-7075-8159-1ef64a9f6420" 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_019e3e32-9d86-75d1-95b9-6e63b2fdb29d" xlink:to="loc_us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedOtherNoncurrentAssets_019e3e32-9d86-7075-8159-1ef64a9f6420" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_sbcf_BusinessCombinationProvisionalInformationInitialAccountingIncompleteAdjustmentAssets_019eb1e0-80be-7726-9be0-073c02d0947e" xlink:href="sbcf-20260630.xsd#sbcf_BusinessCombinationProvisionalInformationInitialAccountingIncompleteAdjustmentAssets"/>
    <link:loc xlink:type="locator" xlink:label="loc_sbcf_BusinessCombinationProvisionalInformationInitialAccountingIncompleteAdjustmentFinancingReceivableExcludingAccruedInterestAfterAllowanceForCreditLoss_019eb1e0-80be-79b0-b0a6-198d357f826c" xlink:href="sbcf-20260630.xsd#sbcf_BusinessCombinationProvisionalInformationInitialAccountingIncompleteAdjustmentFinancingReceivableExcludingAccruedInterestAfterAllowanceForCreditLoss"/>
    <link:calculationArc order="1" weight="1.0" xlink:arcrole="https://xbrl.org/2023/arcrole/summation-item" xlink:from="loc_sbcf_BusinessCombinationProvisionalInformationInitialAccountingIncompleteAdjustmentAssets_019eb1e0-80be-7726-9be0-073c02d0947e" xlink:to="loc_sbcf_BusinessCombinationProvisionalInformationInitialAccountingIncompleteAdjustmentFinancingReceivableExcludingAccruedInterestAfterAllowanceForCreditLoss_019eb1e0-80be-79b0-b0a6-198d357f826c" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_GoodwillPurchaseAccountingAdjustments_019eb1e0-80be-7fe6-87d9-6cc395116adc" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_GoodwillPurchaseAccountingAdjustments"/>
    <link:calculationArc order="2" weight="1.0" xlink:arcrole="https://xbrl.org/2023/arcrole/summation-item" xlink:from="loc_sbcf_BusinessCombinationProvisionalInformationInitialAccountingIncompleteAdjustmentAssets_019eb1e0-80be-7726-9be0-073c02d0947e" xlink:to="loc_us-gaap_GoodwillPurchaseAccountingAdjustments_019eb1e0-80be-7fe6-87d9-6cc395116adc" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_sbcf_BusinessCombinationProvisionalInformationInitialAccountingIncompleteAdjustmentLiabilities_019eb1e0-9aad-78ea-bcdc-baac407f6d6b" xlink:href="sbcf-20260630.xsd#sbcf_BusinessCombinationProvisionalInformationInitialAccountingIncompleteAdjustmentLiabilities"/>
    <link:loc xlink:type="locator" xlink:label="loc_sbcf_BusinessCombinationProvisionalInformationInitialAccountingIncompleteAdjustmentNoncurrentLiabilitiesOther_019eb1e0-9aad-71b8-8691-6dffcc575a19" xlink:href="sbcf-20260630.xsd#sbcf_BusinessCombinationProvisionalInformationInitialAccountingIncompleteAdjustmentNoncurrentLiabilitiesOther"/>
    <link:calculationArc order="1" weight="1.0" xlink:arcrole="https://xbrl.org/2023/arcrole/summation-item" xlink:from="loc_sbcf_BusinessCombinationProvisionalInformationInitialAccountingIncompleteAdjustmentLiabilities_019eb1e0-9aad-78ea-bcdc-baac407f6d6b" xlink:to="loc_sbcf_BusinessCombinationProvisionalInformationInitialAccountingIncompleteAdjustmentNoncurrentLiabilitiesOther_019eb1e0-9aad-71b8-8691-6dffcc575a19" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedLiabilities_019e3e32-bb80-7a7b-85ac-5c10c5d0e99d" 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_019e3e32-bb80-7485-b6d6-ab7be57ed021" xlink:href="sbcf-20260630.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_019e3e32-bb80-7a7b-85ac-5c10c5d0e99d" xlink:to="loc_sbcf_BusinessCombinationRecognizedLiabilityAssumedDeposits_019e3e32-bb80-7485-b6d6-ab7be57ed021" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_sbcf_BusinessCombinationRecognizedLiabilityAssumedSecuritiesSoldUnderAgreementsToRepurchase_019e3e32-bb80-777b-8bab-27aa67a8722b" xlink:href="sbcf-20260630.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_019e3e32-bb80-7a7b-85ac-5c10c5d0e99d" xlink:to="loc_sbcf_BusinessCombinationRecognizedLiabilityAssumedSecuritiesSoldUnderAgreementsToRepurchase_019e3e32-bb80-777b-8bab-27aa67a8722b" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedNoncurrentLiabilitiesOther_019e3e32-bb80-76d4-a21b-2affd405fe8d" 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_019e3e32-bb80-7a7b-85ac-5c10c5d0e99d" xlink:to="loc_us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedNoncurrentLiabilitiesOther_019e3e32-bb80-76d4-a21b-2affd405fe8d" xlink:type="arc"/>
  </link:calculationLink>
  <link:roleRef roleURI="http://www.seacoastbanking.com/role/BusinessCombinationsScheduleofLoanswithDeteriorationofCreditQualityDetails" xlink:type="simple" xlink:href="sbcf-20260630.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_019e22d7-dcd1-7dbf-93ef-e4e1cd779932" 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_019e22d7-dcd1-74cf-b9ac-c99f88901d58" 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_019e22d7-dcd1-7dbf-93ef-e4e1cd779932" xlink:to="loc_us-gaap_FinancingReceivablePurchasedWithCreditDeteriorationAllowanceForCreditLossAtAcquisitionDate_019e22d7-dcd1-74cf-b9ac-c99f88901d58" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FinancingReceivablePurchasedWithCreditDeteriorationDiscountPremium_019e22d7-dcd1-7424-adab-dc931b8007b3" 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_019e22d7-dcd1-7dbf-93ef-e4e1cd779932" xlink:to="loc_us-gaap_FinancingReceivablePurchasedWithCreditDeteriorationDiscountPremium_019e22d7-dcd1-7424-adab-dc931b8007b3" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FinancingReceivablePurchasedWithCreditDeteriorationAmountAtParValue_019e22d7-dcd1-7842-8d4e-28ee091be2b0" 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_019e22d7-dcd1-7dbf-93ef-e4e1cd779932" xlink:to="loc_us-gaap_FinancingReceivablePurchasedWithCreditDeteriorationAmountAtParValue_019e22d7-dcd1-7842-8d4e-28ee091be2b0" xlink:type="arc"/>
  </link:calculationLink>
</link:linkbase>
