Is This a Leap Year?
Check the current year or any year and see exactly why it has 365 or 366 days.
THE 2026 CALENDAR
Is 2026 a leap year?
NO
2026Common year
No, 2026 is not a leap year. It has 365 days.
Days in 2026365Days in February: 28
Days in February
28Previous leap year
2024Next leap year
2028Share the leap-year answerSend this clear year check to someone else.
Check any year
Enter a year to test it instantly against all three leap-year rules.
How do you know if a year is a leap year?
A leap year follows the 4–100–400 rule. Test the rules in order; the century exceptions keep the calendar aligned with Earth’s orbit.
First: divisible by 4
Most years divisible by 4 are leap years.
Then: the century exception
A year divisible by 100 is not a leap year unless the final rule applies.
Finally: divisible by 400
A century year divisible by 400 is a leap year. That is why 2000 was leap, but 2100 will not be.
Leap years around 2026
See the four-year rhythm and its century exceptions at a glance.
When Was Leap Year?
The most recent leap year and the next one are calculated automatically from the current year.
2024 was the most recent leap year. The next leap year is 2028.
Leap Year List From 2026 to 1900
Every leap year from 2026 back to 1900. This leap year list updates automatically each year.
- 2024Leap year
- 2020Leap year
- 2016Leap year
- 2012Leap year
- 2008Leap year
- 2004Leap year
- 2000Leap year
- 1996Leap year
- 1992Leap year
- 1988Leap year
- 1984Leap year
- 1980Leap year
- 1976Leap year
- 1972Leap year
- 1968Leap year
- 1964Leap year
- 1960Leap year
- 1956Leap year
- 1952Leap year
- 1948Leap year
- 1944Leap year
- 1940Leap year
- 1936Leap year
- 1932Leap year
- 1928Leap year
- 1924Leap year
- 1920Leap year
- 1916Leap year
- 1912Leap year
- 1908Leap year
- 1904Leap year
1900 is not included because it is divisible by 100 but not by 400.
What changes in a leap year?
One extra calendar day is added at the end of February.
February gets day 29
February has 29 days instead of 28.
The year has 366 days
A common year has 365 days; a leap year has one more.
The seasons stay aligned
Leap days correct the difference between the calendar year and Earth’s trip around the Sun.
What Is a Leap Year?
A leap year is a calendar year with 366 days instead of 365. The added date is February 29, but the reason for it begins with a fraction of a day that the calendar cannot show.
A year that makes room for the fraction
Earth does not complete its trip around the Sun in exactly 365 days. It takes about 365.242 days. A 365-day calendar leaves a little time uncounted each year, so the leap-day system gathers that difference and returns it to the calendar as a complete date.
What changes — and what stays the same
February gains one date, the year gains one day, and dates after February move two weekdays forward in the following year instead of one. The month order, seasons and twelve-month structure stay the same.
The hidden weekly rhythm
A common year is 52 weeks plus 1 day. A leap year is 52 weeks plus 2 days. That extra remainder is why the weekday pattern shifts faster after a leap year.
A correction, not an extra season
February 29 does not make Earth travel more slowly or create a longer season. It corrects the calendar’s running total so dates continue to match the seasonal year over long periods.
In one sentence: a leap year is the calendar saving tiny fractions of a day and spending them as February 29.
Common year vs. leap year
Calendar detailCommon yearLeap year
Total days365366
Days in February2829
Full weeks + extra days52 + 152 + 2
Weekday shift into next year1 day2 days
When Was the First Leap Year?
There is no single first leap year for every civilization because calendars developed in different places and used different kinds of extra days or months.
Before the familiar leap day
Ancient calendars were already correcting their year by inserting extra time. Some used additional days; others inserted an entire month when the calendar moved away from the seasons.
45 BCE: the familiar repeating system
Julius Caesar introduced the Julian calendar with a 365-day common year and an extra day on a repeating four-year cycle. This is the clearest starting point for the leap-year pattern familiar today.
1582: the modern rule is refined
The Gregorian calendar kept the four-year rhythm but removed three leap years every 400 years through the century and 400-year exceptions used today.
45 BCEShort answer: 45 BCE marks the beginning of the familiar Julian leap-year system, but it was not the first time people adjusted a calendar with extra time.