Use this leap year calculator to check whether a specific year has 365 or 366 days. It is useful for date validation, long-term planning, payroll cycles, contract periods and any calculation where February and calendar length matter.
A year is leap if it is divisible by 400, or divisible by 4 but not by 100. This keeps the calendar aligned with the solar year.
1900 is divisible by 100 but not by 400, so it is not leap. The year 2000 is divisible by 400, so it is leap.
Rule: A year is leap if it is divisible by 400, or divisible by 4 but not by 100.
Example: 2028 is divisible by 4 and not by 100, so it is a leap year with 366 days and 29 days in February.
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