Leap Year Calculator
Check if any year is a leap year and find the next or previous leap year. Understand the Gregorian calendar rules that determine leap years.
Part of our Date & Time Calculators collection.
Leap Year Calculator
Free online calculator
Results update automatically as you type
How to Use This Calculator
- 1
Enter any year.
- 2
See instantly if it's a leap year.
- 3
Find the next and previous leap years.
Leap Year Rules
A year is a leap year if: 1. Divisible by 4 AND 2. NOT divisible by 100, UNLESS 3. Also divisible by 400 Examples: 2024: divisible by 4, not 100 → LEAP YEAR ✓ 1900: divisible by 100, not 400 → NOT a leap year ✗ 2000: divisible by 400 → LEAP YEAR ✓
Example Calculation
Example: Is 2024 a leap year?
Inputs
year: 2024
Result
Yes — 2024 is a leap year
2024 ÷ 4 = 506 (no remainder), and 2024 is not divisible by 100. Therefore it's a leap year with 366 days.
Frequently Asked Questions
Why do we have leap years?
Earth takes approximately 365.25 days to orbit the Sun. Without leap years, our calendar would drift — after 100 years, seasons would shift by about 25 days.
When is the next leap year?
The next leap year after 2025 is 2028. Enter any year above to check.
Is 2100 a leap year?
No. Although 2100 is divisible by 4, it's also divisible by 100 but not by 400 — so it is not a leap year.