Leap Year Checker
Check if a year is a leap year
How to Use
- Enter the year you want to check (e.g., 2024, 2025, 2100)
- Click the "Check" button
- See if the year is a leap year (366 days) or not (365 days)
- View how many days February has in that year
- Fun fact: Leap years include 2020, 2024, 2028, but not 1900 or 2100
- Rule: Leap if divisible by 4, except centuries unless divisible by 400
About This Tool
Instantly determine whether any year is a leap year with our leap year checker. Leap years occur every four years (with some exceptions) to keep our calendar synchronized with Earth's orbit around the sun. These years have 366 days instead of the usual 365, with February getting an extra day (29th). This tool is perfect for calendar planning, understanding date calculations, historical research, birthday tracking for leap day babies, or simply satisfying curiosity. The checker uses the official leap year rules: divisible by 4 but not by 100, unless also divisible by 400. Know instantly if any year has 365 or 366 days.