Age Calculator

Use this free online age calculator to find your exact age from a date of birth. Calculate age in years, months and days in your browser—no sign-up required.

Everything runs in your browser. Your input is not sent to a server.

How to use the Age Calculator

Enter your date of birth in the date field.
Optionally set “Age at the date of” if you want age on a specific day (default is today).
Press Calculate to see full years, months and days.
Copy the result or press Reset to start over.

How it works

The age calculator subtracts the birth date from the chosen date, correctly handling month lengths and leap years. It reports whole years, remaining months and remaining days so you get an exact age rather than a rough year count only.

Common uses include verifying age for forms, planning birthday milestones, or checking how old someone will be on a future date.

Examples

Born 15 March 2000, on 10 June 2025 → 25 years, 2 months and 26 days.
Born 29 February 2004 (leap day), on 1 March 2025 → 21 years and 1 day (leap-year handling applies).
Born 1 January 1990, age on 1 January 2030 → exactly 40 years, 0 months and 0 days.

Age Calculator FAQ

Can I calculate age for a future date?

Yes. Change the “Age at the date of” field to any date after the birth date and press Calculate.

How is age calculated?

Age is the number of full years, months and days between the date of birth and the chosen date, accounting for varying month lengths and leap years.

Does it work for leap-day birthdays?

Yes. The calculator handles 29 February birthdays correctly when comparing against non-leap years.

Is the Age Calculator free?

Yes. It is free, needs no account and runs entirely in your browser.