Leap Year Calculator

This Leap Year Calculator uses 4 steps.

1)   Enter the year you want to check (as long as the year is equal to or above 1582 - which is the beginning of the Gregorian Calendar. In other words 1582 was when leap years were first invented).

2)   See if the number is evenly divisible by 4. Diving the year by 4 will result in a whole number with no remainder if the number is evenly divisible. The number must be evenly divisible by 4! Otherwise, it is not a leap year.

3)   Confirm the number isn't evenly divisible by 100. If a year is evenly divisible by 4, but it is not evenly divisible 100, then it is a leap year. If a year is divisible by both 4 and 100, then it might not be a leap year, and you will have to perform 1 more calculation to check.

4)   Check if the number is evenly divisible by 400 to confirm a leap year. If a year is divisible by 100, but not 400, then it is not a leap year. If a year is divisible by both 100 and 400, then it is a leap year.