Age Calculator – Exact Age in Years, Months and Days

Age Calculator

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

Date of birth

Age on

Pick a date of birth on or before the “Age on” date.

How it works

The calculator counts whole months from the birth date, then the remaining days.
If a month is shorter than the birth day (e.g. born on the 31st), it uses that month's last day.
All calculations use calendar dates, so time zones and daylight saving do not affect the result.

Can I calculate age on a past or future date?

Yes. Change the “Age on” date to see how old someone was or will be on any day.

How are leap-day birthdays handled?

In non-leap years a 29 February birthday is counted on 28 February for age, and the next-birthday countdown uses 1 March.

Results are estimates for general information and are not financial, medical or professional advice.