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Age on a Date and Age-Difference Calculator

Calculate completed years and elapsed days from a birth date to another date.

Your inputs

Your result

Enter your information and select Calculate to see the result.

How this calculator works

Completed years account for whether the birthday has occurred; elapsed days use UTC calendar dates.

Change one assumption at a time to see which inputs have the greatest effect on the estimate.

Worked example

January 1, 2000 to January 1, 2020 is 20 completed years.

Limitations

Legal age rules and inclusive date counting can vary by jurisdiction.

Review this educational estimate against current quotes, official information, and your own budget before making a financial decision.