Leap Year Calculator
Check if a year is a leap year
About This Tool
The Leap Year Calculator instantly tells you whether any year is a leap year. A leap year has 366 days instead of the usual 365, with February having 29 days instead of 28.
Understanding leap years is essential for accurate date calculations, birthday planning, and calendar-related applications. Our free tool makes it easy to check any year.
How It Works
How to Use This Calculator
Using our leap year calculator is simple:
- Enter a year - Type any year (past, present, or future) into the input field.
- Click Check - The calculator instantly determines if it's a leap year.
- View results - See whether the year is a leap year, plus additional information about nearby leap years.
You can also browse a list of upcoming leap years or check multiple years at once.
Formula
Leap Year Rules
A year is a leap year if:
- The year is divisible by 4
- If divisible by 100, it must also be divisible by 400
Examples: 2024 is a leap year (divisible by 4). 1900 was NOT a leap year (divisible by 100 but not 400). 2000 WAS a leap year (divisible by 400).
Examples
Examples
Example 1: Recent Leap Years
- 2020: Leap year (divisible by 4)
- 2024: Leap year (divisible by 4)
- 2028: Leap year (divisible by 4)
Example 2: Century Years
- 1900: NOT a leap year (divisible by 100, not by 400)
- 2000: Leap year (divisible by 400)
- 2100: NOT a leap year (divisible by 100, not by 400)
Example 3: Common Years
- 2023: NOT a leap year
- 2025: NOT a leap year
- 2026: NOT a leap year
Frequently Asked Questions
How do I determine if a year is a leap year?
A year is a leap year if: (1) divisible by 4, AND (2) not divisible by 100, UNLESS (3) also divisible by 400. So 2024 is a leap year, 1900 is not, and 2000 is. The calculator checks any year instantly.
Why do we have leap years?
Earth orbits the Sun in approximately 365.2422 days. Without leap years, the calendar would drift about 1 day every 4 years. After 100 years, seasons would shift by 24 days. Leap years keep the calendar aligned with Earth's orbit.
When is the next leap year?
Leap years occur every 4 years: 2024, 2028, 2032, 2036, and so on. The calculator shows the next leap year from any given date and lists all leap years within a specified range.
What happens to people born on February 29?
Leap day babies (leaplings) typically celebrate on February 28 or March 1 in non-leap years. Legally, most jurisdictions treat March 1 as their birthday in non-leap years for age-related milestones.
How accurate is the Gregorian leap year system?
The Gregorian calendar averages 365.2425 days per year, compared to the actual 365.2422 days. The error is about 1 day every 3,236 years. This is far more accurate than the Julian calendar, which drifted 1 day every 128 years.
Disclaimer
Disclaimer: This calculator provides results based on the Gregorian calendar leap year rules. Results are for general reference only. All processing happens in your browser.
💡 Tips
Tips
- Leap years occur every 4 years, with century exceptions
- February 29 only exists in leap years
- People born on Feb 29 typically celebrate on Feb 28 or Mar 1
- The next leap year after 2024 is 2028
- Use this for accurate age calculations for leap year babies