Leap Year Age Calculator
Enter a date of birth to see how many leap years — and leap days — have occurred during that lifetime.
About this calculator
This leap year age calculator counts every February 29th that has occurred between a date of birth and today, which is useful trivia and especially meaningful for anyone actually born on a leap day.
People born on February 29th only have a 'real' birthday once every four years — this tool highlights that and shows how many true leap-day birthdays have occurred so far.
How it works
Enter the date of birth
Any date works, but the result is most interesting for February 29th birthdays.
Calculate
The tool counts every leap day between then and today.
See the result
View the total leap days lived through.
Frequently asked questions
How often is a year a leap year?
Every year divisible by 4 is a leap year, except century years, which must also be divisible by 400 — so 2000 was a leap year but 1900 was not.
If I was born on Feb 29, when do I 'really' turn a new age?
Legally your age still increases every year on your civil birthday (usually observed as Feb 28 or Mar 1), but your literal birth date only recurs every four years.