Leap Year Checker
Check if a year is a leap year with our accurate leap year checker. Supports single year and range checking with detailed explanations and historical context
Leap Year Checker
Ready to Check
Enter a year or year range to check for leap years
How to Use This Leap Year Checker
Choose Mode
Select whether you want to check a single year or analyze a range of years for leap year patterns.
Enter Year(s)
For single year mode, enter the year you want to check. For range mode, enter both start and end years.
Check Results
Click 'Check' to see if the year is a leap year. The result includes detailed explanations of the leap year rules.
View Explanation
Read the explanation to understand why a year is or isn't a leap year based on the Gregorian calendar rules.
Analyze Ranges
Use range mode to find all leap years within a specific period and see patterns in leap year occurrence.
Share or Save
Use the share button to share your results, or check the history section to see your recent checks.
Leap Year Tips & Facts
A leap year has 366 days instead of the usual 365 days, with February having 29 days instead of 28
Leap years occur approximately every 4 years to keep our calendar synchronized with Earth's orbit around the Sun
The leap year rule: divisible by 4, but if divisible by 100, must also be divisible by 400
2000 was a leap year (divisible by 400), but 1900 was not (divisible by 100 but not 400)
Without leap years, our calendar would drift by about 6 hours each year, causing seasons to shift over time
The Gregorian calendar, introduced in 1582, refined the leap year system to be more accurate than the Julian calendar
Earth's orbit takes approximately 365.24219 days, which is why we need the complex leap year rules
The next century year that won't be a leap year is 2100 (divisible by 100 but not 400)
People born on February 29 are called 'leaplings' and traditionally celebrate birthdays on February 28 or March 1
The leap year system is so accurate that it only drifts by one day every 3,236 years