About the Leap Year Checker tool
The Leap Year Checker determines whether a specific year is a leap year according to the Gregorian calendar rules. Leap years include an extra day on 29 February so that calendars stay aligned with the Earth’s orbit around the sun.
This tool is helpful for developers, teachers, students, and anyone working with date calculations, scheduling, or financial systems that span multiple years.
Leap year rule summary
- A year divisible by 4 is usually a leap year.
- If it is divisible by 100, it is not a leap year unless it is also divisible by 400.
- For example, 2000 is a leap year, but 1900 is not.
Combine this checker with other date and calculator tools from the Calculators section on the Multi‑Tools Hub.