### What is a Leap Year?

A **leap year** is a year with one additional day, which is added to keep synchronized with the astronomical year. Seasons of the year and astronomical events do not repeat in a whole number of days, so it is necessary to add an extra day every few years to catch up with the astronomical year.

In the **Gregorian calendar, we use** today a leap year has 366 days instead of 365. An extra day is added **every four years** at the end of February, so it has 29 days instead of 28. It is necessary because the solar (astronomical) year is a bit longer than 365 days — it has 365 days and almost 6 hours, i.e. it has approximately 365.25 days.

## Calculator to check if a year is a leap year

Please enter a year in the following form, and our calculator will check for you if the entered year is a leap year, i.e. it is 366 days long. It is necessary to have the JavaScript turned on in your browser for the calculator to work.

### Which years are leap?

In our calendar (Gregorian) a leap year is a year which is both evenly divisible by 4 and not divisible by 100 **or just** is evenly divisible by 400.

For example:

- 1996 year
**is a leap year**because it is divisible by 4 and not divisible by 100; - 1800 year
**is not a leap year**because it is divisible by 4, but also by 100; - 2000 year
**is a leap year**because it is divisible by 400.

### When is the next leap year?

The current year 2017 is not leap year. The following nearest years are leap:

- 2020
- 2024
- 2028
- 2032
- 2036
- 2040
- 2044
- 2048
- 2052
- 2056

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