Check whether a year is a leap year and find the next one.
Calculated locally in your browser.
How do you check if a year is a leap year?
A year is a leap year if it is divisible by 4, except century years, which must also be divisible by 400. Leap years add 29 February to keep the calendar aligned with Earth's orbit. For example, 2024 is a leap year, 1900 is not (divisible by 100 but not 400), and 2000 is (divisible by 400).
Understanding your result
Leap years add 29 February to keep the calendar aligned with Earth’s orbit.
Formula and method
A year is a leap year if it is divisible by 4, except century years, which must also be divisible by 400.
Worked example
2024 is a leap year; 1900 is not (divisible by 100 but not 400); 2000 is (divisible by 400).
How to use this tool
- Enter a year.
- See whether it is a leap year and why.
Common mistakes to avoid
- Assuming every year divisible by 4 is a leap year — century years are the exception.
About the Leap Year Checker
Check whether a year is a leap year, see the reason, and find the previous and next leap years.
Who should use this tool
Anyone planning dates or curious about the calendar.
Explore all Date and Time tools
Frequently asked questions
Why isn’t 1900 a leap year?
It is divisible by 100 but not by 400, so it is not a leap year.
How often is a leap year?
Almost every four years, with century-year exceptions.