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Leap Year
Gregorian leap-year rule.
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Gregorian leap-year rule. Runs in the browser. Nothing is uploaded.
About this tool
Check whether a year has 366 days. The Gregorian rule: a year divisible by 4 is a leap year, except years divisible by 100, unless they are also divisible by 400.
How to use it
- 01
Enter the year.
- 02
Read whether it is a leap year.
- 03
Check the next one by changing the year.
FAQ
Frequently asked questions
Was 1900 a leap year?
No. It is divisible by 100 but not by 400. The year 2000 was a leap year because it is divisible by 400.
How many days are in a leap year?
366, because February has 29 days.