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Everyday Life Calculators
Date of Birth Calculator
Estimate a birth date from a known age in years, months and days as of a given date.
Estimated birth date
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About the Date of Birth Calculator
This calculator works backward from a known age to estimate a birth date, the reverse of a typical age calculator.
How it works: Starting from the reference date, the calculator subtracts the given years, then months, then days, letting month and year boundaries roll over automatically (for example, subtracting days can push the result into the previous month).
Handy when you know someone's age as stated at a particular time and need to work out roughly when they were born.
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