Age Calculator

Find your exact age in years, months and days from a date of birth — plus total days lived and a countdown to your next birthday.

Date of birth

Age at date

Your data is processed locally in your browser and is never uploaded to our server.

How to use age calculator

Enter your birth date
Pick your date of birth from the calendar field.
Set the 'age at' date
Defaults to today, but you can choose any date to calculate age on.
Calculate
Click Calculate to see years, months, days and more.

Exact breakdown

Age is shown in years, months and days, not just a rounded number.

Totals and countdown

See total days and weeks lived plus days to your next birthday.

Any reference date

Calculate age on a future or past date, not only today.

Does it account for leap years?

Yes. The calculation uses real calendar dates, so February 29ths are handled correctly.

Can I calculate age on a past date?

Yes — set the 'age at date' field to any date to see how old someone was then.

What if I pick a future birth date?

The tool detects that the birth date is after the reference date and asks you to correct it.