How leap year checker works
A year is leap if divisible by 4, except centuries unless divisible by 400.
Try an example
2000 is leap; 1900 is not.
Good to know
Uses proleptic Gregorian rules, including years before local Gregorian adoption.
Your privacy
Processing happens on this device. We do not upload your input, put it in share links or save it to your favourites. Closing this tab discards the working input; downloaded results remain wherever you save them.