Check if a year is a leap year
Check whether any year is a leap year, see why, and list the nearest leap years before and after it.
Defaults to the current year, but you can check any year, past or future.
Get a yes/no answer plus the specific divisibility rule that decided it.
See the closest leap years before and after the one you checked.
Frequently asked
What is the leap year rule?
A year is a leap year if it's divisible by 4, except century years (divisible by 100), which are only leap years if they're also divisible by 400. That's why 2000 was a leap year but 1900 wasn't.
Why does a leap year matter?
It adds February 29th to keep the calendar year (365.2425 days on average) in sync with the actual time it takes Earth to orbit the sun (about 365.2422 days).
Is the year 0 or negative years supported?
The same divisibility rule is applied mathematically to whatever whole number you enter, though the Gregorian calendar itself wasn't in use for very old or hypothetical years.