Leap Year Checker
Check if a year is a leap year, or list all leap years in a range. 100% free, runs locally in your browser—nothing is uploaded to our servers.
Leap year rule: A year divisible by 4 is a leap year, unless it is divisible by 100 but not by 400. For example: 2000 is a leap year, 1900 is not, 2024 is.