Leap year checker
A leap year has 366 days with 29 February added; this applies the full rule, including the century exception.
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Processing and privacy: The result is calculated inside your browser and your data is not sent to any server.
How to use it
- Enter year.
- The result appears straight away and updates as you edit.
- Copy the result, or copy a link that keeps the same values to share it.
How it is calculated
A year is a leap year if it divides by 4, except when it divides by 100 but not by 400. So 2000 was a leap year and 1900 was not.
Example
Inputs: Year = 2,028. Result: Result: Leap year; Reason: Divisible by 4 and not by 100; Days in the year: 366.
Limits and caveats
- Applies the Gregorian rule to all years, though many countries used the Julian calendar before 1582.
Questions about this tool
Was 2000 a leap year?
Yes, it divides by 400, while 1900 and 2100 are not leap years.
Why do leap years exist?
The solar year is about 365.2422 days, so a day is added roughly every 4 years and 3 are dropped every 400 years to keep the seasons in place.
When is the next leap year?
After 2024 come 2028 and 2032; the tool shows the next one for any year you enter.