Leap Year Checker

This free leap year checker tells you whether a year is a leap year under the Gregorian calendar. The rule: a year is a leap year if it is divisible by 4, except years divisible by 100, unless they are also divisible by 400. So 2000 was a leap year but 1900 was not. The tool shows the verdict, the step-by-step reasoning and the next five leap years. Everything runs in your browser.