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Leap Year Checker
Check whether any year is a leap year and why.
2026 is not a leap year
It does not satisfy the leap-year rule, so February has 28 days.
Leap Year Rule
A year is a leap year if it is divisible by 4, except years divisible by 100 are not leap years unless they are also divisible by 400. That is why 2000 was a leap year but 1900 was not.
Why Leap Years Exist
The Earth takes about 365.2422 days to orbit the sun, not exactly 365 days. Leap years keep the calendar aligned with the seasons over long periods of time.
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