# Leap Year Calculator

This free online date calculator will check to see if the entered year is leap year or not. Leap years are years where an extra day is added to the end of the shortest month, February. The extra day, February 29, is commonly referred to as leap day.

## Range of Years

Check leap years within range of years. Enter from year and to year and find out all the leap years between the range of years.

## What Is a Leap Year?

Leap years are years where an extra, or intercalary, day is added to the end of the shortest month, February. The intercalary day, February 29, is commonly referred to as leap day.

Leap years have 366 days instead of the usual 365 days and occur almost every four years.

## How to Calculate Leap Years

- The year must be evenly divisible by 4;
- If the year can also be evenly divided by 100, it is not a leap year; unless, the year is also evenly divisible by 400. Then it is a leap year.

According to these rules, the years 2000 and 2400 are leap years, while 1800, 1900, 2100, 2200, 2300, and 2500 are not leap years.