Age calculator

How old exactly? Get your legal age in years, months, and days, a countdown to the next birthday, and your age expressed in total days and hours.

How to Age calculator

1. Step 1. Enter your date of birth.
2. Step 2. Optionally change the “age at” date (defaults to today).
3. Step 3. Read exact age, total days lived, and next-birthday countdown.

Frequently asked questions

How is age calculated legally?

A year of age completes on the birthday. The calculator mirrors this: complete years, then remaining months, then leftover days.

Can I calculate age at a past or future date?

Yes — change the “age at” date to any date to find how old someone was (or will be) on that day.

How does it handle month-end birthdays?

Someone born January 31 turns “1 month old” on February 28 in non-leap years — the same convention calendars and most legal systems use.