Age Calculator

Work out an exact age in years and months, plus the total number of days lived, from any birth date. Set the 'as of' date to age someone at a future or past point in time.

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💡 Good to know: Leap years exist because a year is about 365.24 days — the leftover quarter-days add up to one extra day every four years.

Worked example

Age: 36y 1m · Total days: 13,189

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Inputs

Birth date
1990-06-15
As of (today)
today's date, filled in automatically

Frequently asked

How is age counted?

In whole years and months since the birth date, dropping the current month if the day hasn't been reached yet — the same way people say their age.

Does it count leap years?

Yes. The total-days figure uses an exact proleptic-Gregorian calendar, so leap days are included.