Free online leap year calculator. Check if a year is a leap year, batch test multiple years, and find next leap year dates. Gregorian calendar rules. π No registration Β· Data never uploaded
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Leap Year Calculator
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π Everything runs locally: Enter Year and other values are processed on your device, never sent to a server. No data is ever uploaded.
β FAQ
What is a leap year?
Gregorian rule: A year divisible by 4 but not by 100 is a leap year, OR divisible by 400 is also a leap year.
Why do we need leap years?
Earth's orbit takes ~365.2422 days. Leap years compensate for the extra ~0.2422 days per year.
When is the next leap year?
2028 is the next leap year. Enter any year and click 'Next Leap Year' to find out.