Leap Year Checker

The Leap Year Checker is a web tool that accurately determines whether a given year is a leap year based on Gregorian calendar rules.

Three Leap Year Rules

1. Years divisible by 4 are leap years 2. Years divisible by 100 are NOT leap years (common years) 3. Years divisible by 400 ARE leap years (exception to rule 2)

Examples

- 2024: Divisible by 4, so leap year (366 days) - 1900: Divisible by 100 but not 400, so common year (365 days) - 2000: Divisible by 400, so leap year (366 days)

This tool displays the result with detailed rule application, February days, total year days, next and previous leap years, and days until the next leap day. Use the range search to find all leap years in any time period. All processing is in-browser only — no data is sent to any server.