Age calculator

Enter a date of birth to get the exact age in years, months and days, the age in weeks and days, and the days to the next birthday.

Date of birthAge on this date

Choose a date of birth.

Other date tools

To count the days between any two dates, or add working days to a date, use the days between dates calculator.

Frequently asked questions

How is age calculated?

Whole years and months are counted from your birthday first, then the remaining days. Born 31 January, you are one month older on the last day of February.

What if I was born on 29 February?

In years without a 29 February, your birthday is counted as 28 February, which is the usual legal convention.

Can I find my age on a past or future date?

Yes. Change “Age on this date” to any date, for example a deadline, an exam or a retirement date.