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Leap Year Calculator: Check Any Year Instantly

Enter a year to instantly find out whether it's a leap year, plus the nearest previous and next leap years.

The leap year rule, explained

A leap year adds one extra day, February 29, to keep our calendar aligned with Earth's orbit around the sun. The rule is simple but has one important exception: a year is a leap year if it's evenly divisible by 4, unless it's also divisible by 100 - in which case it must also be divisible by 400 to still count as a leap year.

Quick examples

  • 2024 - leap year (divisible by 4)
  • 1900 - not a leap year (divisible by 100, but not by 400)
  • 2000 - leap year (divisible by 400)
  • 2100 - will not be a leap year

Born on February 29? Our Birthday Calculator and Days Until Birthday tools correctly handle leap-day birthdays in non-leap years.

Frequently asked questions

What is the rule for determining a leap year?

A year is a leap year if it is divisible by 4, except for century years, which must also be divisible by 400. For example, 2000 was a leap year, but 1900 was not.

Why do we have leap years?

Earth takes approximately 365.25 days to orbit the sun. Adding an extra day every four years keeps our calendar synchronized with the astronomical year.

When is the next leap year?

Enter any year into the calculator above and it will instantly show you both the next and previous leap years relative to that year.