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Leap Year Checker
Check if any year is a leap year and when the next one is.
CheckerHow to use this tool
Check whether any year is a leap year, see the rule that decides it, and find the leap years either side. The answer covers the century exception that catches most people out.
- STEP 1Type a year.
- STEP 2Press Check Leap Year.
- STEP 3Read the verdict, the reason, and the previous and next leap years.
A year is a leap year if it divides by 4, except century years, which must also divide by 400. That is why 1900 was not a leap year but 2000 was.
All inputs and calculations stay in your browser; TimeKit does not send your entries to a server.
Examples
Ordinary leap year
2028
Leap year — divisible by 4
Century exception
1900
Not a leap year — divisible by 100 but not 400
Exception to the exception
2000
Leap year — divisible by 400
Frequently asked questions
Why is there a century exception at all?
A solar year is about 365.2422 days, slightly under the 365.25 that a plain four-year rule assumes. Skipping three leap days every four centuries removes the surplus.
How accurate is the Gregorian rule?
It drifts by roughly one day every 3,200 years — close enough that no further correction is scheduled.