Leap Year Calculators

Check a single year or list leap years across a span of up to 2,000 years. MiniWebtool’s Is it Leap Year? applies the leap-year rules and helps explain why century years are treated differently.

MiniWebtool’s Leap Years List identifies leap years between selected endpoints from 1600 to 4000. View the years on a timeline or check a single year against the calendar rules.

MiniWebtool’s Next Leap Year Calculator finds the next leap year relative to a chosen year. A timeline and explanation of the Gregorian 400-year cycle show how divisibility rules determine the result.

Check the Gregorian calendar rule with MiniWebtool’s When is Leap Year?. Enter a year to see whether February has twenty-nine days, why the rule applies, and the neighboring leap years.