Does it handle leap years?

Yes. The calculation uses real calendar dates, so 29 February and leap-year day totals are correct.

Can I calculate age on a future date?

Yes — change the second date to any date after the birth date to see what the age will be then.

Is my date of birth stored?

No. The calculation runs in your browser and nothing is sent to a server.

Age Calculator

Enter a date of birth to see an exact age in years, months and days, plus the total days lived and how long until the next birthday.

Date of birth

Age as of

Defaults to today.

Exact age

—

Pick a date of birth to calculate.

How to use the Age Calculator

1Choose the date of birth in the date field.
2Optionally change the date you want the age measured on.
3Read the exact age and the extra statistics underneath.

About this tool

Age is counted in completed years, then completed months, then the remaining days. Because months have different lengths, subtracting dates numerically gives the wrong answer — this calculator walks the calendar instead.

Leap years are included automatically, so someone born on 29 February gets an accurate total day count.

Benefits

Exact to the day
Calendar lengths and leap years are handled properly.
Birthday countdown
See how many days remain until the next birthday.
Nothing leaves your device
The work happens inside your browser, so your files and text stay private.
Works on your phone
The layout, buttons and inputs are built mobile-first and are fully keyboard accessible.