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Check whether any year is a leap year and see nearby leap years.
Check whether any year is a leap year and see nearby leap years.
Enter values above and click Calculate — results will appear here with the formula explained.
Earth takes about 365.2422 days per orbit, so calendars drift without correction. Adding February 29 every four years overshoots slightly — three leap days too many per four centuries. The Gregorian fix skips century years unless divisible by 400: 1700, 1800 and 1900 were common years, while 2000 was leap.
That century rule surprises people checking 2100 — divisible by 4, yet not a leap year. The calculator applies the complete rule so long-range planning (and trivia arguments) stay correct.
Check whether any year is a leap year and see nearby leap years. Formula: leap if divisible by 4 AND (not by 100 OR by 400). Example: 2000 ÷ 400 checks out, so 2000 was a leap year.
Earth takes about 365.2422 days per orbit, so calendars drift without correction. Adding February 29 every four years overshoots slightly — three leap days too many per four centuries. The Gregorian fix skips century years unless divisible by 400: 1700, 1800 and 1900 were common years, while 2000 was leap.
That century rule surprises people checking 2100 — divisible by 4, yet not a leap year. The calculator applies the complete rule so long-range planning (and trivia arguments) stay correct.
2000 ÷ 400 checks out, so 2000 was a leap year. 1900 fails the century exception and wasn't. The next such skip arrives in 2100.
Formulas are standard public references (see our methodology). External standards are cited in the text where they apply.
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