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Leap Year Calculator
Check whether any year is a leap year, meaning it has 366 days with an extra 29 February.
About the Leap Year Calculator
Check whether any year is a leap year, meaning it has 366 days with an extra 29 February.
How to use the Leap Year Calculator
- Enter the Year.
- Press Check year to see the answer and the reason.
Formula and method
A year is a leap year if it is divisible by 4, except century years, which must also be divisible by 400.
| Year | Leap year? | Reason |
|---|---|---|
| 2024 | Yes | Divisible by 4 |
| 2023 | No | Not divisible by 4 |
| 1900 | No | Century year not divisible by 400 |
| 2000 | Yes | Divisible by 400 |
| 2100 | No | Century year not divisible by 400 |
Worked example
2028 ÷ 4 = 507 with no remainder and 2028 is not a century, so it is a leap year.
Century years. 2024 is a leap year. 1900 was not, because it is divisible by 100 but not by 400. 2000 was a leap year, because it is divisible by 400.
When to use the Leap Year Calculator
- Checking whether a year has 366 days.
- Working out the correct number of days in February.
- Planning contracts and birthdays that fall on 29 February.
Common mistakes to avoid
- Thinking that every year divisible by 4 is a leap year. Century years are an exception.
Tips
- Leap years keep the calendar aligned with the Earth's orbit, which takes about 365.2422 days.
Frequently asked questions
When is the next leap year?
Leap years occur every four years, for example 2028, 2032 and 2036.
Why do we have leap years?
A solar year is about 365.2422 days. The extra day every four years keeps the calendar in line with the seasons.
When is the next leap year?
Enter a year in the tool to check, or look for years divisible by 4, such as 2028.