Age Calculator
Work out an exact age in years, months and days between any two dates. The second date defaults to today but can be set to anything, which makes it just as useful for working out how old someone will be on a future date as for checking an age right now.
How to calculate age
- Pick the date of birth.
- Optionally change the “as of” date — it defaults to today.
- Read the exact age below.
When you'd use this
- Form eligibility — Checking whether someone meets an age requirement on the exact closing date of an application.
- Official paperwork — Documents that ask for age in years, months and days rather than just years.
- Planning ahead — Working out how old a child will be at the start of a school year.
- Anniversaries — Counting exactly how long ago something happened.
Good to know
- Both dates are yours to set — The second field starts as today but can be moved to any past or future date.
- Leap years are handled — The calculation counts real calendar days, so 29 February and leap years are accounted for correctly.
- Months vary in length — Because months are 28 to 31 days long, an age in months and days is calculated calendar by calendar rather than by averaging.
- Time zones are not involved — Only the dates you enter are used, so the result is the same wherever in the world you open the page.
Frequently asked questions
Can I calculate age as of a past or future date, not just today?
Yes — change the “As of date” field to any date you like.
Does it account for leap years?
Yes — the calculation is based on real calendar dates, so leap years are handled correctly.
Can I calculate an age on a future date?
Yes. Change the second date to any day ahead and you will get the age as it will be then — useful when a form asks for your age as of a deadline.
Does it handle 29 February birthdays?
Yes. The calculation works in real calendar days, so a leap-day birthday is counted correctly.
Why do the months and days look different from another calculator?
Because months have different lengths, tools can break the same span down slightly differently. The total number of days is the figure that never varies.