How to Use Leap Year Checker
Check if any year is a leap year, with the previous and next leap years.
Open the Leap Year Checker tool →What is Leap Year Checker?
Check if any year is a leap year, with the previous and next leap years. It's completely free, needs no sign-up, and runs entirely in your browser — so it's fast and private.
How to use Leap Year Checker
- Open the Leap Year Checker tool.
- Enter your values or options.
- The result updates instantly as you type.
- Use or copy the result. Everything runs in your browser — nothing is uploaded.
Frequently asked questions
What makes a leap year?
A year divisible by 4 is a leap year, except century years, which must also be divisible by 400 — so 2000 was a leap year but 1900 wasn't.
Why do we have leap years?
To keep the calendar aligned with Earth's orbit, which takes about 365.24 days. The extra day (Feb 29) corrects the drift.
Ready to try it?
Open Leap Year Checker →