Calculate exact age from date of birth
Years, months, days, and days to next birthday.
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About this tool
Pick a date of birth and get the exact age in years, months and days, the same age expressed in months, the total days lived, and how long until the next birthday.
The as-of date is adjustable, which is the feature that matters for forms: government applications often want your age on a specific cutoff date, not today. Calculated locally, nothing stored.
How it works
- Type an amount and pick your currencies.
- The result updates live as you type.
- Swap the direction with one click.
Frequently asked questions
How is exact age in years, months and days calculated?
Calendar arithmetic, not day counting: full years first, then full months, then leftover days, borrowing from the previous month when needed. It is the same method forms and registrars expect.
Can I check my age on a specific date, like an exam cutoff?
Yes, change the as-of date. Applications often require your age as of a cutoff like August 1st, and this shows exactly that instead of your age today.
Does the calculation handle leap years?
Yes. Date arithmetic uses the real calendar, so February 29th birthdays and leap-year day counts come out correctly.