Leap Year Checker
Check if any year is a leap year with explanation of the rule and a list of the next 10 upcoming leap years
Enter a year to check if it's a leap year
Check if a year is a leap year and learn about the leap year rule.
What's a Leap Year?
A year with 366 days instead of 365, with an extra day added to February (29 February). Rules: divisible by 4, EXCEPT not divisible by 100 UNLESS also divisible by 400. So 2024 is leap (÷4), 2025 is not (not ÷4), 2100 is NOT leap (÷100, not ÷400), 2000 was leap (÷400).
Why? Earth's orbit takes 365.2422 days. The extra day every 4 years compensates for the 0.25, but overcorrects slightly - hence the century rule. Without leap years, the calendar would drift 24 days per century. The Gregorian calendar's leap year system keeps drift to about 1 day per 3,236 years - good enough for ordinary planning.
Recent and Upcoming Leap Years
| Year | Leap? |
|---|---|
| 2020 | Yes |
| 2024 | Yes |
| 2025 | No |
| 2026 | No |
| 2027 | No |
| 2028 | Yes |
| 2032 | Yes |
| 2100 | No (century, not ÷400) |
| 2400 | Yes (÷400) |
Frequently Asked Questions
Why is 2100 not a leap year?
Century rule: years divisible by 100 are NOT leap years, unless also divisible by 400. 2100 ÷ 4 = yes (525), but ÷ 100 = yes (21), and ÷ 400 = no (5.25 - not whole). So 2100 is regular. Same for 1700, 1800, 1900. 2000 WAS leap because it IS divisible by 400.
What if I'm born on 29 February?
Most jurisdictions treat 1 March as your birthday in non-leap years (legally for things like driving licences, voting eligibility). Some informal traditions: celebrate on 28 February instead. Born 29 Feb 2024, you 'celebrate' your 1st birthday on either 28 Feb 2025 or 1 Mar 2025.
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