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Leap Year Checker
Check if any year is a leap year with 366 days
How this tool works
Enter any year to check if it's a leap year. Leap years occur every 4 years, with exceptions for century years unless they're divisible by 400. They have 366 days instead of 365.
Enter a year using the number input
Click "Check Leap Year" to verify
Use "Current Year" to quickly check this year
View detailed results and leap year rules
Copy results for sharing or reference
Leap Year Calculation:
Follows Gregorian calendar rules
Accounts for century year exceptions
Shows adjacent leap years for context
Valid for years 1 through 9999