Age Calculator
Math & EverydayFind exact age in years, months, days and total days lived.
Runs entirely in your browser — nothing is uploaded
What people do next
Features
- Exact age broken into years, months and days.
- Totals in months, weeks, days, hours and minutes.
- Countdown to the next birthday and the weekday you were born on.
- Measure against any target date, not just today.
How to use the Age Calculator
- 1Pick your date of birth.
- 2Optionally change the "age at" date.
- 3Read the full breakdown and next-birthday countdown.
Frequently asked questions
How are leap years handled?
Calendar arithmetic counts real elapsed days, so 29 February and leap years are handled exactly.
How is the day count handled at the end of a month?
By borrowing the real length of the preceding month rather than assuming every month has 30 days. Someone born on 31 January, measured on 1 March in a non-leap year, comes out as one year and one day rather than one year and a negative number of days. Calculators that treat months as equal get these cases wrong by a day or two.
Why is my age in months not simply years times twelve?
Because the leftover days do not add up to a whole month. The totals count complete months only, so five years and twenty days is sixty months rather than sixty and a fraction. The years-months-days breakdown and the totals answer slightly different questions, which is why both appear.
What happens with a birthday on 29 February?
In a non-leap year the countdown lands on 1 March, since 29 February does not exist and the date rolls forward. Which day someone legally becomes a year older varies between jurisdictions; for ordinary counting this is the usual convention.