Check whether any year is a leap year and see its total number of days.
Calculation Result
Leap Year
This year has 366 days.
Selected Year
—
Days in Year
366
February Days
29
Leap Year Rule
A leap year is divisible by 4, except century years unless they are also divisible by 400.
The Leap Year Calculator checks whether any year you enter is a leap year (366 days) or a common year (365 days), and explains exactly why using the standard leap year rule.
It also shows the nearest leap years before and after the one you entered, so you can quickly see the pattern. This is useful for anyone planning around February 29th, working with date logic, or just curious about a specific year.