Leap Year Checker Calculator
Determine whether any year is a leap year, understand the leap year rules, and explore historical and future leap years for calendar planning.
Leap Year Check Results
Leap Year Analysis:
Calendar Information:
About
Our Leap Year Checker helps you determine whether any year is a leap year using the official Gregorian calendar rules, essential for calendar planning and date calculations.
Why Choose
Accurate leap year calculations, support for historical and future years, bulk checking capabilities, and educational insights about calendar systems and leap year rules.
Features
Single year checking, range analysis, century and decade exploration, visual calendar representation, and comprehensive leap year statistics and patterns.
Benefits
Plan events accurately, understand calendar patterns, verify historical dates, prepare for software development, and learn about astronomical calendar systems.
Enter Year
Input any year from 1 to 9999, or select a range option to check multiple years, decades, or entire centuries for comprehensive analysis.
Apply Rules
The calculator applies Gregorian calendar rules: divisible by 4, except century years must be divisible by 400 for accurate leap year determination.
View Results
Get instant results with detailed analysis, visual calendar representation, related leap years, and educational information about the year checked.
Frequently Asked Questions - Leap Year Checker
Leap year rules: 1) If divisible by 4, it's usually a leap year. 2) However, if it's a century year (divisible by 100), it must also be divisible by 400. Examples: 2024 (divisible by 4) = leap year, 1900 (divisible by 100 but not 400) = not leap year, 2000 (divisible by 400) = leap year.
Earth takes approximately 365.25 days to orbit the sun, not exactly 365 days. Without leap years, our calendar would drift by about 6 hours per year. After 100 years, seasons would shift by 25 days. Leap years add an extra day every 4 years to keep our calendar aligned with Earth's orbit.
The Earth's orbit is actually 365.2422 days, slightly less than 365.25. Adding a leap day every 4 years overcorrects by 11 minutes annually. Century years skip the leap day unless divisible by 400, removing 3 leap days every 400 years to maintain accuracy.
People born on February 29th are called "leaplings" or "leapers." They technically have a birthday only every 4 years. In non-leap years, they typically celebrate on February 28th or March 1st. Legally, most jurisdictions consider their birthday to be March 1st in non-leap years for age calculations.
The Gregorian calendar is very accurate but not perfect. It has an error of about 1 day every 3,030 years. This means our calendar will need adjustment around the year 4909 CE. The system is accurate enough for all practical purposes for centuries to come.