Age Calculator
Find someone's exact age in years, months and days, plus a countdown to their next birthday.
Enter a date of birth to see the result.
How It Works
- 1Enter a date of birth.
- 2Optionally change the 'as of' date.
- 3See the exact age breakdown instantly.
Features
- Years, months and days breakdown
- Total days and weeks lived
- Countdown to next birthday
Privacy
All calculations happen instantly in your browser. Nothing you enter is ever sent anywhere.
About Age Calculator
This tool works out a calendar age rather than a raw day count. It walks from the birth date to the reference date counting whole elapsed years, then whole elapsed months, then the remaining days, so the breakdown matches how someone would actually describe their age at their next birthday rather than a rough division of total days by 365.25.
It's useful whenever you need an exact figure instead of an approximation: checking eligibility that depends on a specific age threshold, working out how many days old a baby is, planning around a milestone (10,000 days, a 25th anniversary), or figuring out someone's age as of a contract date, exam date or other fixed point rather than today.
Because it follows the calendar, results are sensitive to leap years and month lengths — the same span of time can show a different day count depending on which months and years it crosses. The calculator doesn't account for time zones, since it works from calendar dates rather than exact timestamps.