Leap Year Calculator
Check if any year is a leap year and see upcoming leap years.
Leap Year Checker
Algorithm Rules:
- The year must be evenly divisible by 4;
- If the year can also be evenly divided by 100, it is not a leap year;
- Exception: if the year is also evenly divisible by 400, then it is a leap year.
What is a Leap Year?
A leap year contains one additional day (February 29th) to keep the calendar year synchronized with the astronomical year or seasonal year.