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Leap Year Calculator
Check whether any year is a leap year and see the rule that decides it, plus the number of days in that year and a list of the next leap years.
About Leap Year Calculator
A year is a leap year if it is divisible by 4, except years divisible by 100 — unless they are also divisible by 400. So 2000 was a leap year but 1900 was not. Leap years have 366 days, with the extra day added as 29 February, to keep the calendar aligned with Earth’s orbit. Enter any year to check it and to see the next few leap years.