Age Calculator

Your age in years, months and days is a calendar calculation, not a division. The calculator counts whole years up to your most recent birthday, then whole months from that birthday, then the remaining days — so it stays correct across leap years and months of different lengths.

Method: step forward from the date of birth in whole months while staying on or before the target date, then count the leftover days. The total-days figure is a straight count of calendar days between the two dates.

If you were born on 29 February, the calculator treats 28 February as your birthday in non-leap years (some countries use 1 March instead). Change the "age on" date to work out your age at any past or future date — a school cut-off, a retirement date, or a historical event.