Check if any year is a leap year under the Gregorian rules, with the century exception explained. Shows day counts and nearby leap years. Free tool. All processing runs locally in your browser. Your data is not uploaded to any server.
100% Local Processing
How to Use
Type any year and instantly learn whether it is a leap year, under the official Gregorian calendar rules, with the century exception plainly explained.
Steps
Enter the year you are interested in.
Click Check.
Read whether it is a leap year and why, plus the day count.
The Gregorian rule
A year divisible by 4 is a leap year.
Except century years, which must divide by 400 to be leap.
So 2000 was a leap year but 1900 was not.
Days in February and the whole year are reported for context.
Features
The century rule is applied exactly.
Shows the previous and next leap years for planning.
Computes instantly in the browser.
All processing runs locally in your browser. Your data is not uploaded to any server.