Leap Year Calculator
Check whether any year is a leap year using the Gregorian calendar rules.
How to use this tool
- Enter year in the fields above.
- Results update instantly as you type — or click Calculate.
- Read your is leap year? and the full breakdown beneath it.
Check whether any year is a leap year using the Gregorian calendar rules.
Frequently asked questions
- What is the leap year rule?
- A year is a leap year if it is divisible by 4, EXCEPT century years (divisible by 100) which must also be divisible by 400.
- Why was 1900 not a leap year?
- 1900 is divisible by 100 but not by 400, so it is not a leap year. 2000 was a leap year because it is divisible by 400.