Verify any year's leap status with our Leap Year Checker. While most people know that a leap year occurs every four years, the Gregorian calendar contains complex exceptions for century years. Our utility rigorously applies all rules—including the 100-year and 400-year exceptions—to give you a definitive answer for any historical or future date.
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Leap Year Checker
Check if any year is a leap year. Accurate validation following the Gregorian calendar rules.
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Enter Year
Verify if a year contains 366 days
Status
Gregorian Calendar Rule
2026 is a Common Year
February in this year has 28 days.
How are Leap Years determined?
To keep our calendar in alignment with Earth's revolutions around the Sun, a leap year is added every 4 years. However, the rule has specific exceptions:
- Rule 1: The year must be evenly divisible by 4.
- Rule 2: If the year is also divisible by 100, it is not a leap year...
- Rule 3: ...unless the year is also divisible by 400. Then it is a leap year.
Example: 2000 was a leap year (divisible by 400), but 1900 was not (divisible by 100 but not 400).
About Leap Year Checker
1
Enter Year
Type the specific year you want to verify (e.g., 2024).
2
Check
The tool applies Gregorian calendar rules to determine if it's a leap year.
3
Result
Get an instant 'Yes/No' answer with an explanation of the math.
Key Features
Rule Transparency
Explains precisely why a year is or isn't a leap year based on calendar math.
Millennial Precision
Supports calculations for years far in the past or far into the future.
Academic Accuracy
Ideal for students and programmers debugging time-based logic.
Frequently Asked Questions
To keep our calendar in alignment with the Earth's revolutions around the Sun.
A year is a leap year if it is divisible by 4, except for years divisible by 100 but not by 400.
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