Leap Year Calculator
Check whether a year is a leap year, how many days it contains, and when the next leap year falls.
Show solution steps
What is the Leap Year Calculator?
A leap year has 366 days instead of 365, with an extra day added to February (the 29th) to keep the calendar aligned with Earth's orbit.
How to Calculate
A year is a leap year if it's divisible by 4 — except century years, which must also be divisible by 400. So 2000 is a leap year but 1900 and 2100 are not.
Formula
Leap if (year ÷ 4) and not (century unless ÷ 400)
How to Use
- Enter your details in the fields above.
- The result updates instantly as you type.
- Use Copy, Print or Download PDF to save your result.
Frequently Asked Questions
Why do we need leap years?
Earth takes about 365.24 days to orbit the Sun. Adding a day every four years keeps our calendar from drifting out of sync with the seasons.
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