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Enter any year to find out if it is a leap year.
A leap year has 366 days, with February 29 added to keep the calendar aligned with the seasons. A year is a leap year if it is divisible by 4, except century years, which must also be divisible by 400.
Is 2100 a leap year?
No. 2100 is divisible by 4 but it is a century year not divisible by 400, so it is not a leap year.
Why do we have leap years?
Earth takes about 365.25 days to orbit the Sun, so an extra day every four years keeps the calendar in sync with the seasons.