Birth Year Calculator
Someone told you their age but not their birth year? Enter it below and we'll work it out.
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Approximate Birth Date Range--
How it works
Enter a current age and the calculator works backward from today's date to find the birth year. Because it's impossible to know whether the person's birthday has already happened this year, the result shows both possible years and the date range each one covers.
Frequently asked questions
Why does it show two possible birth years?
Someone's age alone doesn't reveal whether their birthday has already passed this year, so the birth year could be one of two values.