Leap Year Checker
Check if any year is a leap year and find the next leap year.
Check whether any year is a leap year and find the next one. A leap year has 366 days, with an extra day on 29 February. The rule: a year is a leap year if it is divisible by 4 — except century years, which must also be divisible by 400. So 2000 was a leap year but 1900 was not, and 2100 will not be.
Leap years keep the calendar aligned with Earth's ~365.2422-day orbit; without them, the seasons would slowly drift.
Frequently asked questions
What makes a year a leap year?
It must be divisible by 4, except century years (divisible by 100) which must also be divisible by 400. So 2024 and 2000 are leap years; 1900 is not.
Why do we need leap years?
Earth takes about 365.2422 days to orbit the Sun. Adding a day every four years keeps the calendar in step with the seasons.
Is 2100 a leap year?
No. It is divisible by 100 but not 400, so it is skipped — one of the rule's famous exceptions.
What happens if you were born on 29 February?
Leaplings usually celebrate on 28 February or 1 March in common years; their exact birthday occurs once every four years.