# How do you calculate leap years?

Leap years almost always occur every four years, (i.e. in years that are divisible by 4). The only exceptions to this is that years that are evenly divisible by 100 are not leap years, unless they are also divisible by 400.
So this means that the years 1700, 1800, 1900, etc., were not leap years, but the year 2000 was, and the years 2400 and 2800 will be.
Q&A Related to "How do you calculate leap years?"
 1. Divide the year for which you are trying to determine a leap year by four. If the year is not divisible by four, it is not a leap year. If the year is divisible by four, continue http://www.ehow.com/how_7546950_calculate-leap-yea...
 The modern civil/business calendar inserts February 29th in a leap year. Every year divisible by '4' is a leap year, except for the last year of each Century . 1800, 1900, 2000, etc http://wiki.answers.com/Q/How_are_the_leap_years_c...
 During a leap year, one extra day is added to the year during the month of February making 366 day of that year. Leap years occur every 4 years unless it is a century year, then it http://www.ask.com/web-answers/Society/Other/how_o...
 Rule 1: Any year evenly divisible by 400 IS a leap year. Rule 2: Any year evenly divisible by 100 is NOT a leap year, unless it conflicts with Rule 1. Rule 3: Any year evenly divisible http://answers.yahoo.com/question/index?qid=200712...