Age Calculator

Find an exact calendar age as of any date.

Your inputs

Calculation details

Date of birthAge on date

⌁ All calculations run locally in your browser. No data is stored.

Age36 yr 6 mo 4 days

Years36

Months after last birthday6

Total days lived13,334

Calendar age accounts for varying month lengths and leap years.

Calendar subtraction accounts for real month lengths and leap years instead of assuming every year has the same number of days.

Change any input to update the estimate instantly. Your entries never leave your device.

Can I calculate age on a past date?

Yes. Change the Age on date field to any date after the birth date.

Are leap years included?

Yes. Total elapsed days use actual calendar dates.