Leap Year Checker
Check if any year is a leap year, with the rule explained.
2024 is a leap year.
February 2024 has 29 days, and the year has 366 days.
A year is a leap year if it is divisible by 4 — except for years divisible by 100, which are only leap years if they are also divisible by 400. So 2000 was a leap year but 1900 was not.
Free leap year checker. Enter any year to instantly find out whether it's a leap year, understand the divisible-by-4 rule, and see the next few upcoming leap years. Runs in your browser.
How to use the Leap Year Checker
- 01Type any year.
- 02See immediately whether it's a leap year.
- 03Read the rule and browse the next leap years.
Frequently asked questions
What makes a year a leap year?
A year is a leap year if it's divisible by 4, except years divisible by 100 which must also be divisible by 400. So 2000 was a leap year, but 1900 was not.
Why do we have leap years?
Earth takes about 365.24 days to orbit the Sun. Adding a leap day every four years keeps the calendar aligned with the seasons.