Leap Year Calculator
Enter a year to find out whether it is a leap year, how many days it contains, and which leap years come right before and after it.
How to check a leap year
- Enter the year you want to check.
- See whether it is a leap year and how many days it has.
- Read the next and previous leap years for context.
Examples
Year 2000
2000
Leap year, 366 days
Year 1900
1900
Not a leap year, 365 days
Frequently asked questions
What makes a year a leap year?
A year is a leap year if it is divisible by 4, except for century years, which must also be divisible by 400. So 2000 is a leap year but 1900 is not.
Why is 1900 not a leap year but 2000 is?
Both are divisible by 4 and by 100, but only 2000 is divisible by 400. The 400 rule keeps the calendar aligned with the solar year.
How many days are in a leap year?
A leap year has 366 days, with the extra day added as February 29. A common year has 365 days.
When is the next leap year?
Leap years normally fall every four years. Enter any year and the tool shows the next and previous leap years directly.
Is my data private?
Yes. Everything is calculated in your browser and nothing is uploaded.
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