Age Calculator

We take your date of birth and calculate the difference to today's date in whole years, months, and remaining days — accounting for varying month lengths and leap years, not just dividing total days by 365.

A calendar-accurate breakdown differs from dividing total days by 365.25 because months have different numbers of days. The calculator counts the same way you would on a physical calendar, borrowing from months and years as needed.

The calculator finds the next occurrence of your birth month and day from today's date, and shows both the exact date of your upcoming birthday and the number of days remaining.

The calculator detects a birth date that hasn't happened yet and shows a clear message asking you to check the date, instead of displaying a negative or nonsensical age.

Yes. Age is computed using JavaScript's native Date object, which correctly accounts for leap years (including February 29th) when working out calendar year, month and day differences.