Calculate Your Age
Find your exact age in years, months and days.
How to use the Age Calculator
Enter the date of birth
Type or pick the birth date. The result updates as soon as it is valid.
Set the date to measure to
Today is used by default. Change it to any past or future date to get the age as of that day.
Read the result
You get years, months and days, along with the total days lived.
About the Age Calculator
Working out an exact age is more fiddly than it looks. Months have different lengths, leap years move the goalposts, and the mental arithmetic goes wrong precisely when it matters, on a visa application, a pension form, an insurance quote or a school enrolment. This calculator does it properly: enter a date of birth and get the age in years, months and days, plus the total number of days lived.
The method matches the one used on official forms. Complete years are counted first, then the remaining whole months, then the leftover days, so the answer agrees with what an administrator would arrive at rather than a decimal approximation of it. Leap days are handled correctly, including for people born on 29 February, whose age advances on schedule in common years.
You can also change the target date to something other than today, which answers the questions people usually need answered: how old someone will be on a particular future date, or how old they were on a date in the past. The calculation runs entirely in your browser, so the date of birth you enter is never sent anywhere.
Frequently asked questions
- How is age calculated?
- Full years are counted first, then remaining months, then remaining days — the same method used on official forms.
- Can I calculate age at a specific past or future date?
- Yes. Change the target date and the result is recalculated for that day rather than today.
- Does it handle leap years?
- It does. Leap days are counted correctly, including for people born on 29 February.