🎂 Age Calculator
Your precise age on any date, plus total days and weeks lived and which weekday your next birthday falls on.
🔒 Runs in your browser · files never uploaded
—Exact age
—Total months
—Total weeks
—Total days
—Total hours (approx.)
—Next birthday
Born on 29 February? In non-leap years your birthday is counted on 28 February.
How to use the Age Calculator tool
- Enter a date of birth.
- Leave "age at" as today or pick any other date.
- Read the exact age, totals and next birthday countdown.
Frequently asked questions
How is exact age calculated?
We count whole months from your birth date (shortening the day if a month is shorter, e.g. 31 Jan → 28 Feb), then the remaining days. That matches how people naturally count birthdays and "monthiversaries".
I was born on 29 February – when is my birthday?
In non-leap years we count it on 28 February, so you turn a year older before March. For example, from 29 Feb 2000 to 28 Feb 2024 is 23 years, 11 months and 30 days.
Can I calculate age at a past or future date?
Yes. Change the "age at" date to find someone's age on a historic date or how old you'll be at retirement.