Math

Age Calculator

Find out exact age in years, months and days, and count down to the next birthday.

Date of birth

Calculate age on

How to use it

Enter the date of birth.
Leave the comparison date as today, or choose another date.
Read the exact age, total days lived and days until the next birthday.

How it works and why it matters

The Age Calculator gives your exact age in years, months and days, which a simple subtraction of years does not. It is useful for school forms, legal paperwork, eligibility checks, pregnancy and baby milestones, and for fun birthday countdowns.

Questions

How is exact age calculated?

The tool counts full years first, then months and days, so the result matches how most official forms expect age to be written.

Can I calculate age on a past or future date?

Yes. Change the 'Calculate age on' date to any day after the date of birth.

Why is the next birthday count sometimes 0?

If today is your birthday, the countdown shows 0 days.