Leap year calculator
Enter a year to check if it's a leap year.
Leap year calculator
Check whether any year is a leap year and see the next leap year. Leap years add a 29th of February to keep the calendar aligned with Earth’s orbit.
The rule
A year is a leap year if it’s divisible by 4, except years divisible by 100, unless also divisible by 400. So 2000 was a leap year, 1900 was not, and 2024 is. Leap years occur almost every 4 years.
Frequently asked questions
Was 2000 a leap year? Yes — divisible by 400.
Why isn’t every 100th year a leap year? To correct a small over-counting; the 400-year rule fine-tunes it.