Leap Year Calculator
Check if a given year is a leap year according to the Gregorian calendar rules.
Published by:
isCalculator Editorial Team
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How to use this tool?
Follow these simple steps to check if a year is a leap year:
- Enter a year in the input field (e.g., 2024). Only positive whole numbers are accepted.
- Click the "Check Leap Year" button or press Enter on your keyboard.
- View the result:
- A green alert means the year is a leap year (366 days).
- A yellow alert means it is not a leap year (365 days).
- Read the explanation below the result to understand the Gregorian calendar rules applied.
No special units or formats are needed—just enter a year as a number.
Previous Results
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Frequently Asked Questions
A leap year is a year that has 366 days instead of 365, adding an extra day (February 29) to keep the calendar year synchronized with the astronomical year.
According to the Gregorian calendar, a year is a leap year if it is divisible by 4, except for years divisible by 100 unless they are also divisible by 400.
1900 is divisible by 100 but not by 400, so it is not a leap year. The rule ensures accuracy over long periods.