Leap Year Calculator to
Check One or Generate Range of Years

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Checks whether a specified year is or isn't a leap year, or generates of list of leap years from one year through another.

This free online date calculator will check to see if the entered year is leap year according to the Gregorian calendar.

Or, if you enter a starting year and an ending year, the calculator will generate a list of leap years for the given range. And not only will the list include the dates of each leap day, but it will also include the day of the week that each leap day falls on.

And finally, if the start year is a leap year, and a special occasion (birth, wedding, etc.) occurred on February 29th of that year, the calculator will also report how many times you were able to celebrate on the anniversary date.

Last Leap Year

According to the current date as reported by your device , the last leap year was .

Next Leap Year

According to the current date as reported by your device , the next leap year will be .

What is a Leap Year?

A leap year is one that contains 366 days versus a normal year that contains 365 days. This extra leap day is added to the month of February, meaning the month of February has 29 days in a leap year whereas the month of February in a non-leap year only has 28 days.

When is a Leap Year?

The extra day is added to years where:

  • The number 4 divides into the year evenly but the number 100 does not.
  • Or, the number 400 divides into the year evenly.

Why Do We Need Leap Years?

The reason adding an extra day every four years (with some exceptions) is needed, is because it takes the earth roughly 365.2422 days to travel around the sun (a solar year), whereas as the Gregorian calendar is based on a 365-day year.

This means that if we didn't add leap days to the calendar on a regular basis, the calendar year would continually fall further and further behind the solar year -- causing our seasons to get out of whack.

With that let's use the leap year calculator to check to see if a specific year is a leap year, or to generate a list of leap years within a given range of years.

Leap Year Calculator
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Instructions: If you just want to check if a certain year was (or will be) a leap year, enter the year to check and click the "Calculate Leap Year" button.

Or, if you want to generate a list of leap years for a specified range of years, enter the start year and the end year and then click the "Calculate Leap Year" button.

Mouse over the blue question marks for a further explanation of each entry field. More in-depth explanations can be found in the glossary of terms located beneath the Leap Year Calculator.

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Help Check year or range start year:
Help Range end year (optional):
Help Is start year a leap year?
Help Number of leap years from start year to now:
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Leap Year Calculator Glossary of Terms

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Check year or range start year: Enter the 4-digit year you would like to check. Or, if you want the calculator to generate list of leap years, consider the year entered on this line to be the starting year for the range.

Range end year: If you want the calculator to generate list of leap years between a range of years, consider the year entered on this line to be the ending year for the range. Otherwise, leave this field blank if you are only checking to see whether or not a specific year is a leap year.

Is start year a leap year? Based on the entered year to check (or start year), this field will report whether or not that year is a leap year (Yes or No).

Number of leap years from start year to now: If the entered start year is a leap year, and is earlier than the present year, the leap year calculator will count how many times a February 29th has occurred from the start year through the present date.

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