Label	Element	Value
Risk/Return:	rr_RiskReturnAbstract
Document Type	dei_DocumentType	Other
Document Period End Date	dei_DocumentPeriodEndDate	Apr. 30, 2015
Registrant Name	dei_EntityRegistrantName	CALVERT VARIABLE SERIES INC
Central Index Key	dei_EntityCentralIndexKey	0000708950
Amendment Flag	dei_AmendmentFlag	false
Document Creation Date	dei_DocumentCreationDate	May 06, 2015
Document Effective Date	dei_DocumentEffectiveDate	May 06, 2015
Prospectus Date	rr_ProspectusDate	Apr. 30, 2015
Calvert VP SRI Balanced Portfolio
Risk/Return:	rr_RiskReturnAbstract
Supplement [Text Block]	cik0000708950_SupplementTextBlock	CALVERT VP SRI BALANCED PORTFOLIO Supplement to: Calvert Variable Products Prospectus dated April 30, 2015 Calvert Variable Products Prospectus Class F dated April 30, 2015 Date of Supplement: May 6, 2015
Performance Table Heading	rr_PerformanceTableHeading	Average Annual Total Returns (as of 12/31/14)
Performance Table Narrative	rr_PerformanceTableNarrativeTextBlock	In the Portfolio Summary for Calvert VP SRI Balanced Portfolio under “Investments, Risks and Performance – Performance” on page 3, delete the second and third rows of the “Average Annual Total Returns” table and replace them with the following (table heading included for ease of reference):
Calvert VP SRI Balanced Portfolio \| Class F \| Russell 1000 Index
Risk/Return:	rr_RiskReturnAbstract
1 Year	rr_AverageAnnualReturnYear01	13.24%
5 Years	rr_AverageAnnualReturnYear05	15.64%
10 Years	rr_AverageAnnualReturnYear10	7.96%
Calvert VP SRI Balanced Portfolio \| Class F \| Balanced Composite Benchmark (reflects no deduction for fees or expenses)
Risk/Return:	rr_RiskReturnAbstract
1 Year	rr_AverageAnnualReturnYear01	11.14%
5 Years	rr_AverageAnnualReturnYear05	12.25%
10 Years	rr_AverageAnnualReturnYear10	7.60%
Calvert VP SRI Balanced Portfolio \| Class I \| Russell 1000 Index
Risk/Return:	rr_RiskReturnAbstract
1 Year	rr_AverageAnnualReturnYear01	13.24%
5 Years	rr_AverageAnnualReturnYear05	15.64%
10 Years	rr_AverageAnnualReturnYear10	7.96%
Calvert VP SRI Balanced Portfolio \| Class I \| Balanced Composite Benchmark (reflects no deduction for fees or expenses)
Risk/Return:	rr_RiskReturnAbstract
1 Year	rr_AverageAnnualReturnYear01	11.14%
5 Years	rr_AverageAnnualReturnYear05	12.25%
10 Years	rr_AverageAnnualReturnYear10	7.60%

Label

Element

Value

Risk/Return:

rr_RiskReturnAbstract

Document Type

dei_DocumentType

Other

Document Period End Date

dei_DocumentPeriodEndDate

Apr. 30, 2015

Registrant Name

dei_EntityRegistrantName

CALVERT VARIABLE SERIES INC

Central Index Key

dei_EntityCentralIndexKey

0000708950

Amendment Flag

dei_AmendmentFlag

false

Document Creation Date

dei_DocumentCreationDate

May 06, 2015

Document Effective Date

dei_DocumentEffectiveDate

May 06, 2015

Prospectus Date

rr_ProspectusDate

Apr. 30, 2015

Calvert VP SRI Balanced Portfolio

Risk/Return:

rr_RiskReturnAbstract

Supplement [Text Block]

cik0000708950_SupplementTextBlock

CALVERT VP SRI BALANCED PORTFOLIO

Supplement to:

Calvert Variable Products Prospectus

dated April 30, 2015

Calvert Variable Products Prospectus

Class F

dated April 30, 2015

Date of Supplement: May 6, 2015

Performance Table Heading

rr_PerformanceTableHeading

Average Annual Total Returns (as of 12/31/14)

Performance Table Narrative

rr_PerformanceTableNarrativeTextBlock

In the Portfolio Summary for Calvert VP SRI Balanced Portfolio under “Investments, Risks and Performance – Performance” on page 3, delete the second and third rows of the “Average Annual Total Returns” table and replace them with the following (table heading included for ease of reference):

Calvert VP SRI Balanced Portfolio | Class F | Russell 1000 Index

Risk/Return:

rr_RiskReturnAbstract

1 Year

rr_AverageAnnualReturnYear01

13.24%

5 Years

rr_AverageAnnualReturnYear05

15.64%

10 Years

rr_AverageAnnualReturnYear10

7.96%