Leap years
Check a year or list leap years within an interval.
Check whether a year is a leap year or automatically list the leap years included in a year interval.
Calculation mode
Result
--
- Leap years found
- --
- Interval analyzed
- --
- Rule used
- Divisible by 4, except by 100, unless also by 400.
Years found
Quick explanation
Choose Year mode to check a single year, or Year interval mode to list the leap years between two bounds. The result updates automatically whenever a value changes.
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Additional information
Check a leap year
This tool lets you quickly check whether a year is a leap year. Enter a year, or use the Current year button to fill the field automatically.
The result updates automatically whenever the year changes. There is no calculate button to press.
List leap years in an interval
Year interval mode lets you enter a start year and an end year. The tool then lists all leap years included in that interval.
If the two bounds are reversed, the calculation still works: the tool shows the result for the absolute interval and clearly indicates the inversion.
Rule used
A year is a leap year if it is divisible by 4, except years divisible by 100, unless they are also divisible by 400.
For example, 2000 is a leap year, but 1900 is not. This rule matches the Gregorian calendar.
Display limit
To keep the page readable, the interval is limited to 500 years. This limit only affects the display of the list of found years.
To analyze a longer period, split it into several shorter intervals.
Limits and reuse
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