Enter any year to find out if it's a leap year, or set a start year and end year to list every leap year in that range. You'll see whether your chosen year qualifies, how many leap years fall in your range, and a full list of those years below.
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Next Leap Year
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Previous Leap Year
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Total Leap Years in Range
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A leap year is a calendar year that has 366 days instead of the usual 365. The extra day — February 29th — is added to keep the calendar year synchronized with the solar (astronomical) year, which is approximately 365.25 days long.
A year is a leap year if it is divisible by 4, EXCEPT for century years (divisible by 100), which must also be divisible by 400. So 2000 was a leap year, but 1900 was not. In formula form: (year % 4 === 0 && year % 100 !== 0) || (year % 400 === 0).
Leap years occur every 4 years. After 2024, the next leap year is 2028. You can enter any year in this calculator to instantly find the next and previous leap years from that point.
Yes, 2024 is a leap year. It is divisible by 4 and not a century year, so it qualifies under the standard Gregorian leap year rules. February 2024 had 29 days.
The Earth takes approximately 365.2422 days to orbit the Sun. Without leap years, our calendar would drift about one day every four years relative to the seasons. Adding a leap day every four years (with century corrections) keeps the calendar aligned with Earth's orbit.
Adding a leap day every 4 years overcorrects slightly. Century years are skipped to remove the excess — except every 400 years, when a leap day is added back. This is why 1900 was not a leap year but 2000 was.
A leap year has 366 days. The extra day is always February 29th, making February 29 days long instead of the usual 28.
People born on February 29th are sometimes called 'leaplings' or 'leap day babies'. In non-leap years, they typically celebrate their birthday on either February 28th or March 1st, depending on personal preference and local legal convention.