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Check if any year is a leap year and find next/previous leap years instantly.
A leap year is a year with 366 days (an extra February 29) that occurs every 4 years, with exceptions for century years not divisible by 400, to keep the calendar aligned with Earth's orbit.
| Year | Leap? | Days |
|---|---|---|
| 2020 | Yes | 366 |
| 2024 | Yes | 366 |
| 2028 | Yes | 366 |
| 2032 | Yes | 366 |
Formula
Leap Year = (year % 4 == 0 AND year % 100 ≠ 0) OR (year % 400 == 0)year % 4 = Year is divisible by 4 (basic rule)
year % 100 = Century year exception—skip leap if divisible by 100
year % 400 = Exception to exception—keep leap if divisible by 400
Worked Example
Is 2028 a leap year?
Did you know? The Gregorian calendar's leap year system is accurate to within 1 day every 3,236 years. Pope Gregory XIII introduced this system in 1582, skipping 10 calendar days to realign with the solar year.
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