Leap Year Checker Online Free
Check whether any year is a leap year instantly. See February days, total days in the year, next leap year and previous leap year.
Check a Year
Quick Examples
Leap Year Rule
Result
Calculation Breakdown
How to Use the Leap Year Checker
Check any year in three simple steps.
1. Enter a year
Type the year you want to check, such as 2024, 2030 or 2100.
2. Check the result
The tool tells you if the year is leap or common instantly.
3. Review the rule
See whether the year is divisible by 4, 100 and 400.
Understand leap years without confusion.
Leap years keep the calendar aligned with Earth's orbit around the Sun. This checker explains the rule clearly and shows why a year is or is not a leap year.
Enter any year to see whether it has 365 or 366 days, whether February has 28 or 29 days, and which divisible-by-4, 100 and 400 rules apply.
What is a Leap Year Checker?
A Leap Year Checker tells you whether a selected year is a leap year or a common year, using the standard calendar rule.
It is useful for date planning, schoolwork, calendar calculations, birthdays on February 29, software testing, scheduling and understanding how the Gregorian calendar works.
When should you use it?
- Checking if a year has February 29
- Learning the leap year rule
- Finding next and previous leap years
- Planning dates, birthdays and events
- Checking calendar logic for projects
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Leap Year Checker FAQ
Common questions about leap years.
What is a leap year?
A leap year is a year with 366 days instead of 365. The extra day is February 29.
How is a leap year calculated?
A year is a leap year if it is divisible by 4, except century years must also be divisible by 400.
Why is 2100 not a leap year?
2100 is divisible by 100 but not by 400, so it is not a leap year.
Why was 2000 a leap year?
2000 is divisible by 400, so it was a leap year.
How many days are in a leap year?
A leap year has 366 days.
How many days does February have in a leap year?
February has 29 days in a leap year.
Can I copy the leap year result?
Yes. Click Copy Result to copy the year, result, February days, previous leap year and next leap year.
Does it work on mobile?
Yes. This Leap Year Checker works on desktop, tablet and mobile browsers.