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.
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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. Formula: leap if divisible by 4 AND (not by 100 OR by 400)
Leap Year Checker: 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.
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)
| Field | What to enter |
|---|---|
| Year | e.g. 2028 |
All fields use the exact formulas shown below — results include step-by-step breakdowns you can verify by hand.
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.
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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.
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