Free Leap Year Calculator
Check whether a year is a leap year.
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Inputs
Result
Is leap year?
Yes
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Short answer
Check whether a year is a leap year.
What is the Leap Year Calculator?
Check whether a year is a leap year.
How does the Leap Year Calculator work?
Enter the inputs above and read the result.
Formula
Variables
yearGregorian calendar year
Explanation
The Gregorian calendar rule adds a leap day every 4 years, except century years not divisible by 400.
Examples
Applications
Advantages
Limitations
Common mistakes
Tips
Related concepts
The Leap Year Calculator sits inside the Date & Time Calculators hub, in the date arithmetic & calendars cluster. Adding to or classifying a date. Understanding the terms below makes the output easier to interpret and easier to compare against neighbouring measures.
Practical use cases and industry applications
Understanding Leap Year
Check whether a year is a leap year. Within date & time calculators, leap year belongs to the date arithmetic & calendars cluster, where it shares terminology and assumptions with closely related tools.
Learning how leap year is calculated
The Gregorian calendar rule adds a leap day every 4 years, except century years not divisible by 400. Working through the variables one at a time — year — makes the result reproducible by hand and easier to sanity-check.
Using leap year to make a decision
Because outputs depend on the assumptions you enter, run more than one scenario before committing to a figure.
How leap year compares with related measures
calendar rule, weekday, leap year, week number all describe adjacent aspects of date arithmetic & calendars. Comparing this calculator's output against those measures — using the related tools listed on this page — prevents a single metric from being read in isolation.
Frequently asked questions
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