Leap Year Checker

Check whether any year is a leap year and see the next leap years coming up.

How to use leap year checker

  1. Enter a year
  2. Read whether February has 28 or 29 days
  3. Check the next leap years

Worked example

Year 2100

A common year with 365 days

How the result is calculated

Gregorian leap years are divisible by 4, except centuries that are not divisible by 400. This explains why 2000 is a leap year but 1900 is not.

Inputs stay in your browser. You can use this tool without joining the waitlist or creating an account.

From a calculation to a daily glance

Keep the whole month in view.

Choose a monthly calendar design that follows the actual month length, including leap-year February.

  1. 1Add the events you want to see to your calendar.
  2. 2Enable that calendar in the app.
  3. 3Add Monthly Calendar; use Edit Widget → Design to choose its look.
Get early accessExplore widget designs

Web results do not automatically sync to the app. Setup is manual; calendar events appear through your enabled calendars.

February
SMTWTFS
1
2
3
4
5
6
7
Birthday ♡
8
9
10
11
12
13
14
MeetingsCelebration
15
16
17
18
19
20
21
CelebrationWorkshopMeetingProject reviewTeam dinner
22
23
24
25
26
27
28
Vacation
1
2
3
4
5
6
7
Monthly Calendar · example design from the app

Frequently asked questions

Is this year a leap year?
Enter any year and the checker tells you instantly whether it's a leap year, with February having 29 days, or a common year with 28. It defaults to the current year.
What are the leap year rules?
A year is a leap year if it's divisible by 4, except years divisible by 100 - unless they're also divisible by 400. So 2000 was a leap year, but 1900 was not. This keeps the calendar aligned with Earth's orbit.
When is the next leap year?
The checker lists the next several leap years after the one you enter. For a calendar that always shows the right number of days, Monthly Calendar Widgets renders an accurate month grid on your iPhone Home Screen.

More free calendar tools