Date & Time Calculators
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Leap Year Checker
Check whether any year is a leap year. Understand the 400-year Gregorian leap year rule and view upcoming and historical leap years.
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Leap Year Checker & Calendar Rules
Is this year a leap year? Our Leap Year Checker instantly tests any year against the astronomical Gregorian calendar rules, explains why February 29 occurs, and lists all nearby leap years at a glance.
Key Features:
- Instant evaluation with mathematical rule explanation.
- List of past 10 and next 10 leap years for quick reference.
- Educational breakdown of astronomical solar year vs calendar year.
How to Use:
- Enter any calendar year (e.g. 2024, 2028, 2000, 2100).
- Get an instant verdict: Leap Year (366 days) or Common Year (365 days).
- Review the mathematical proof using the 4, 100, and 400 year rules.
The Three Rules of the Gregorian Calendar
1. A year is a leap year if it is evenly divisible by 4.\n2. Exception: If the year is also divisible by 100, it is NOT a leap year.\n3. Exception to exception: If the year is also divisible by 400, it IS a leap year! (Hence, 2000 was a leap year, but 1900 was not, and 2100 will not be).
Frequently Asked Questions:
Earth takes approximately 365.2422 days to orbit the sun. Adding a leap day roughly every four years keeps our calendar seasons synchronized with the solar equinoxes and solstices.