📅 Leap Year Checker — Gregorian Rules
Enter a year to see if February has 29 days, why the rule matched, and the nearest leap years on either side.
How it works
- Type a year from 1 through 9999.
- Press Check year. A year is a leap year when it is divisible by 4, except century years, which must be divisible by 400.
- Read the verdict plus the previous and next leap years.
Examples
- 2024 is a leap year because it is divisible by 4.
- 1900 is not a leap year because it is a century not divisible by 400.
- 2000 is a leap year because it is divisible by 400.
Frequently asked questions
Which calendar rule is used?
The proleptic Gregorian rule: divisible by 4, but not by 100 unless also divisible by 400. Julian-only calendars are not applied.
Does this predict holidays?
No. It only answers whether February has 29 days in that year and lists nearby leap years.
Is the year uploaded?
No. The division checks run in the page and nothing is sent to a server.
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