Leap Year Calculator
Enter a year to check whether it's a leap year and find the next leap year after it.
Last updated: September 5, 2026
Frequently asked questions
Is 2024 a leap year?
Yes - 2024 is divisible by 4 and not a century year, so it's a leap year with 366 days. The next leap year after 2024 is 2028.
What's the rule for leap years?
A year is a leap year if it's divisible by 4, except century years (divisible by 100), which must also be divisible by 400 - so 2000 was a leap year, but 1900 and 2100 are not.
Are century years always leap years?
No - century years (like 1900 or 2100) are leap years only if divisible by 400, not just by 4. That's why 2000 was a leap year but 1900 and 2100 are not - this extra rule keeps the calendar aligned with the solar year over long periods.
Why was the leap year rule created in the first place?
A solar year is about 365.2422 days, not exactly 365, so without leap years the calendar would drift out of sync with the seasons by about a day every four years. Adding a leap day roughly every four years (with century-year exceptions) keeps the calendar aligned with Earth's orbit over long periods.
How many days are in February during a leap year?
29 days, instead of the usual 28 - the extra day is always added to February specifically, which is why leap years have 366 total days instead of 365.
Was the year 2000 a leap year, given it's a century year?
Yes - 2000 is divisible by 400 (not just 100), so it satisfies the century-year exception and counts as a leap year, unlike 1900 or 2100 which are divisible by 100 but not 400.
How do I find the next leap year after any given year, not just 2024?
Enter any year above and the calculator finds the next one after it automatically - it checks each following year against the divisible-by-4/century/400 rule until it finds a match, typically within 4 years.