Leap Year Checker
Check if any given year is a leap year according to the Gregorian calendar.
Local-first
Result
Common year
2026 has 365 days.
How this tool works
What it accepts, how to use it, and where your input is processed.
Show GuideHide Guide
How this tool works
What it accepts, how to use it, and where your input is processed.
Show GuideHide Guide
A Leap Year is a calendar year that contains an additional day—February 29th—added to keep the calendar year synchronized with the astronomical year or seasonal year.
The Rules of Leap Years:
1
Divisible by 4
Most years that are divisible by 4 are leap years.
2
The 100 Year Exception
If a year is divisible by 100, it is NOT a leap year...
3
The 400 Year Exception
...unless it is also divisible by 400. Then it IS a leap year.
Need an extra feature or found an edge case?Send Feedback
Related tools
Open after you finish the primary task.
ShowHide
Related tools
Open after you finish the primary task.
Days Between Dates
MathCalculate the exact number of days, weeks, or months between any two dates.
Open tool
Days Until Date
MathCount down the number of days remaining until a specific event or deadline.
Open tool
Age Difference Calculator
MathCalculate the exact age gap between two people in years, months, and days.
Open tool