Calendar & Dates
Leap Year Calculator
Check whether a year is a leap year and see the rule.
Open the tool to see results.
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How this tool works
Leap years are divisible by 4, except century years unless divisible by 400.
All calculations run in your browser. No account is required, and this static version does not store your inputs.
Why was 2000 a leap year but 1900 was not?
Because 2000 is divisible by 400, while 1900 is divisible by 100 but not by 400.