Age Calculator
Turn a birth date into an exact age in years, months, and days, with totals and a next-birthday countdown.
Processed locally in your browser — nothing is uploaded.
Leave empty to use today.
Pick a date of birth to see the age.
About Age Calculator
Pick a date of birth and get the age broken down the way people actually say it — years, months, and days — plus the raw totals in months, weeks, and days. An optional as-of date lets you compute an age at any point in time, past or future.
It also counts down to the next birthday and tells you which weekday it lands on.
Common uses
- Fill in exact-age fields on official forms
- Work out someone's age on a specific historical date
- See how many days until the next birthday and what day of the week it falls on
Example
Input
Born 1990-06-15, as of 2026-08-29
Output
36y 2m 14d · 13,224 days · next birthday in 290 days (Tuesday)
Limitations
- February 29 birthdays roll over to March 1 in non-leap years for the next-birthday countdown.