🗓️
Check Leap Years
Check if years are leap years
By Craftisle Team
About Check Leap Years — Free Online Tool
Check if one or more years are leap years. A leap year is divisible by 4, but not by 100 (unless also divisible by 400). Useful for date calculations, birthday reminders, and calendar applications.
How to Use Check Leap Years — Step by Step
- Enter years
Type or paste years (one per line).
- Check
Click Check Leap Years. Results show which years are leap years.
- Review
Review the results and use for your calculations.
Use Cases for Check Leap Years
Birthday reminders
Find leap years for birthday reminders (Feb 29).
Date calculations
Check if a year has 366 days.
Calendar apps
Validate leap years in calendar applications.
FAQ — Check Leap Years Free Online Tool
What is a leap year?
A year with 366 days. Occurs every 4 years, except century years not divisible by 400.
Why 2100 is not a leap year?
Century years must be divisible by 400 to be leap years. 2100 ÷ 400 = 5.25, so not a leap year.