Otaku Dojo Tools
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Age Calculator

The Age Calculator works out an exact age in years, months and days from a date of birth, plus total days, weeks and months lived and the date, weekday and countdown to the next birthday. You can also choose an "as of" date to find someone's age on a specific day, such as an eligibility cutoff.

  • Free
  • No sign-up
  • Runs in your browser
Options
Age
The result will appear here
Results appear as you type

How to use the Age Calculator

  1. Select the date of birth.
  2. "Age as of" defaults to today; choose another date to calculate the age on that day.
  3. Exact age, total days and days until the next birthday appear instantly.

Examples

Exact age

Input
Born 1995-08-15 | as of 2026-10-03
Output
31 years, 1 month, 18 days
Total days: 11,372

Specs & key facts

ResultsAge in years / months / days, total days, weeks, months, hours
Birthday infoNext birthday date, weekday and countdown
Born on Feb 29Birthday counted as Feb 28 in non-leap years
As-of dateToday by default, or any date
ProcessingIn your browser (your birthday is never uploaded)
PriceFree, no sign-up

FAQ

How is age calculated?

You turn one year older on each birthday. The remaining months and days are counted from your last birthday to the as-of date.

When does someone born on February 29 have a birthday?

In non-leap years this tool uses February 28.

Can I calculate age on a past or future date?

Yes. Set "Age as of" to any date after the date of birth.