Leap Year Calculator
Check whether a year is a leap year. A leap year adds one extra day to the calendar, February 29.
- Free
- Works offline after your first visit
- Saves on this device
- No sign-up
- Updated
How it works
A year is a leap year when it divides evenly by 4, except century years, which must also divide evenly by 400. So a century year counts as a leap year only when the number formed by its first two digits divides evenly by 4.
February has 29 days in a leap year and 28 in other years, and this page reads that count from the calendar for the year you type.
Worked example
2,028 has 29 days in February, so it is a leap year.
Questions
Why is 1900 not a leap year?
It is a century year that does not divide evenly by 400, so it is skipped, even though it divides evenly by 4.
How often do leap years come?
Most years that divide by 4 are leap years, so about one year in four is a useful rough guide, with the century exceptions.
Do I need a leap year for a date?
Only if you use a date in February. The extra day is February 29.
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