A leap year has 366 days, one extra day (Feb. 29) over a normal year. Nearly every 4 years is a leap year (97 leap years out of every 400 years).

Is it a leap year? Last leap year before & next leap year after this year

The leap year algorithm. The three conditions to check in order to know whether a year is a leap or a common one:

1) A leap year can be evenly divided by 4

2) Except if it can be evenly divided by 100 then it isn't a leap year

3) Except if it can be evenly divided by 400, then it's a leap year

Latest checked up years / leap or common years?

Is 1732 a leap year? When is the last leap year before 1732? When is the next leap year after 1732? Sep 25 07:49 UTC (GMT)
Is 2020 a leap year? When is the last leap year before 2020? When is the next leap year after 2020? Sep 25 07:32 UTC (GMT)
Is 2017 a leap year? When is the last leap year before 2017? When is the next leap year after 2017? Sep 25 07:31 UTC (GMT)
Is 3360 a leap year? When is the last leap year before 3360? When is the next leap year after 3360? Sep 25 07:27 UTC (GMT)
Is 2020 a leap year? When is the last leap year before 2020? When is the next leap year after 2020? Sep 25 07:27 UTC (GMT)
Is 2018 a leap year? When is the last leap year before 2018? When is the next leap year after 2018? Sep 25 07:25 UTC (GMT)
Is 1982 a leap year? When is the last leap year before 1982? When is the next leap year after 1982? Sep 25 07:18 UTC (GMT)
Is 4818 a leap year? When is the last leap year before 4818? When is the next leap year after 4818? Sep 25 06:44 UTC (GMT)
Is 4816 a leap year? When is the last leap year before 4816? When is the next leap year after 4816? Sep 25 06:44 UTC (GMT)
Is 4808 a leap year? When is the last leap year before 4808? When is the next leap year after 4808? Sep 25 06:44 UTC (GMT)
Is 4804 a leap year? When is the last leap year before 4804? When is the next leap year after 4804? Sep 25 06:44 UTC (GMT)
Is 4800 a leap year? When is the last leap year before 4800? When is the next leap year after 4800? Sep 25 06:43 UTC (GMT)
Is 4796 a leap year? When is the last leap year before 4796? When is the next leap year after 4796? Sep 25 06:43 UTC (GMT)
All users checked up years / leap or common

Leap Years. Common Years. What are they and why do we need them? Leap years algorithm.

What is a leap year? What is a common year?

A leap year contains 1 extra day, February 29th, over an ordinary year, 366 vs. 365.

How often do the leap years occur in the calendar?

Nearly once every four years, 97 leap years at every 400 years.

Why do we need leap years?

They keep the calendar year synchronized with the astronomical year, preventing us, for example, from celebrating Christmas in November.

Leap years algorithm.

Every year that is evenly divisible by 4 is a leap year, except for years that are evenly divisible by 100, but these years are leap years if they are evenly divisible by 400:

Examples of leap years.

  • Leap years multiples of 4 but not of 100 nor of 400: 1992, 1996, 2004, 2008, 2012, 2016, 2020, 2024, 2028;
  • Common years (NOT LEAP YEARS) multiples of 100, but not of 400: 1700, 1800, 1900, 2100, 2200, 2300;
  • Leap years multiples of 400: 1600, 2000, 2400.

What is a leap year? What is a common year?

How often do the leap years occur in the calendar?

Why do we need leap years?

Leap years algorithm. Examples.

When did the leap year originate?

The modern (Gregorian) calendar and the Julian one. Julian calendar adjustment

How accurate is the Gregorian calendar, based on the leap year algorithm?


See all the articles about leap years above grouped together as a single article.


List of all the leap years between 1582 and 4818.