Free Online Leap Year Checker Tool
Check if any year is a leap year using the official Gregorian calendar rules. See why a year is or isn't a leap year, how many days February has, and get a list of nearby leap years. 100% client-side, 100% private.
2026 is not divisible by 4, so it's not a leap year.
Gregorian calendar rules · 100% client-side
How to Use the Leap Year Checker Tool
Enter a Year
Type any year from 1900 to 2100 into the input field. The result updates instantly.
View the Result
See whether it's a leap year, how many days February has, and a plain-English explanation of why.
Explore Nearby Years
Browse the list of previous and upcoming leap years around your selected year.
Powerful Leap Year Checker Features
Everything you need to check leap years — all in one free tool.
Instant Leap Year Check
Enter any year and see instantly whether it's a leap year. Updates as you type.
Gregorian Rule Explanation
Get a plain-English explanation of why the year is or isn't a leap year based on the official rules.
February Day Count
See exactly how many days February has for the selected year: 28 or 29.
Leap Year History
View a list of recent and upcoming leap years around your selected year.
Year Range Support
Works for years from 1900 to 2100, covering both regular and century leap years.
Quick Presets
Quick-check common years: current year, last leap year, next leap year, and century years.
Copy Results
Copy the result to your clipboard with a single click.
100% Client-Side
All calculations happen in your browser. No server uploads.
Why Use Our Leap Year Checker Tool
The clearest way to check leap years. Instant, explained, and private.
100% Free
No hidden fees, no usage limits. Check as many years as you need.
Clear Explanations
Not just a yes/no answer — understand WHY with the Gregorian rules explained.
Fun Facts Included
See nearby leap years and interesting leap year statistics.
No Installation
Works entirely in your browser. No downloads, no plugins, no setup.
Key Highlights
- No sign-up required
- 100% client-side
- Gregorian rule explanations
- February day count
- Nearby leap year list
- Works on any device
Frequently asked questions
What is a leap year?
A leap year has 366 days instead of 365, with an extra day added on February 29. Leap years keep our calendar synchronized with Earth's orbit around the sun, which takes approximately 365.2422 days.
Is this leap year checker really free?
Yes, completely free. No hidden charges, no usage limits.
What are the Gregorian leap year rules?
A year is a leap year if: (1) it's divisible by 4, AND (2) if it's a century year (divisible by 100), it must also be divisible by 400. So 2000 was a leap year, but 1900 was not.
Why was 1900 not a leap year?
1900 is divisible by 100 (century year) but not by 400. According to the Gregorian rule, century years must be divisible by 400 to be leap years. So 1900 had a regular 28-day February.
Is 2000 a leap year?
Yes! 2000 is divisible by 4, 100, AND 400. It's a century leap year — one of the rare ones. The next century leap year will be 2400.
Do I need to install anything?
No installation required. Works entirely in your web browser.
Can I use this on my phone?
Yes, fully responsive and works on all devices.