Leap Year Calculator
Check whether any year is a leap year, see how many days it has, and find the next leap years.
Is it a leap year?
No
Days in the year
365 days
February
28 days
Next leap years
2028, 2032, 2036, 2040, 2044
Leap day
—
How this was worked out
- Rule 12,026 ÷ 4 = 506.5 ✗ not divisible by 4
- Rule 2Not a century year, so rule 1 decides ✓
Formula
A year is a leap year if it is divisible by 4, except century years, which must be divisible by 400.
Example
Input
2024
Result
Leap year — 366 days
Frequently asked questions
A year is about 365.2422 days long, so an extra day roughly every four years keeps the calendar aligned with the seasons.
Century years must be divisible by 400 to be leap years. 2000 was a leap year; 1900 was not.
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