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Leap Year Calculator
Why Leap Years Exist
A year of 365 days seems tidy, yet Earth needs about 365.2422 days to circle the sun. Leap years patch the gap by inserting an extra day, February 29, roughly every four years. Without this correction, the calendar would drift about 24 days per century, eventually moving summer holidays into winter.
Julius Caesar introduced the first leap system around 46 BC, and the Gregorian reform of 1582 refined it so the average year almost matches the solar cycle. That refinement is exactly the century rule explained below.
The Rule for Spotting a Leap Year
A year is a leap year when it divides evenly by 4, except century years, which must also divide by 400. That is why 2000 was a leap year while 1900 was not, even though both are divisible by 100. The next leap year is 2028, followed by 2032.
The rule keeps the average calendar year at 365.2425 days, so seasons stay aligned within one day for about 3,300 years. The tool applies this test instantly and can list every leap year between two chosen years.
Using the Calculator, Plus Classic Pitfalls
Under Calculate:, choose If a specific year is a leap year to test one date, All leap years between two years to build a list, or The next leap year for a countdown. Then fill in the Year to check: box, or the Start year: and End year: fields, and press Calculate.
The century rule is the classic pitfall: any year ending in 00 must pass the 400 test, so 2100 and 2200 will be common years despite ending in round numbers. Double check those cases in old records and project plans, where a wrong leap day can quietly shift birthdates, schedules, and anniversary math.
Frequently Asked Questions
Is 2000 a leap year and why?
Yes. Although 2000 is a century year, it divides evenly by 400, which satisfies the Gregorian exception, so it included a February 29. Century years such as 1900 and 2100 fail that test and remain common years.
Why was 1900 not a leap year?
The year 1900 divides by 4 and by 100 but not by 400, so the century exception removed its leap day. Only century years divisible by 400, like 1600 and 2000, keep February 29.
When is the next leap year?
The next leap year is 2028, followed by 2032 and 2036. Leap years normally arrive every four years, though the century rule occasionally stretches the gap, as between 2096 and 2104.
Do leaplings get a birthday every year?
People born on February 29 age one year every year but only mark the real date in leap years. Many celebrate on February 28 or March 1 in common years, and local laws differ on which official day applies.
How many days does a leap year have?
A leap year has 366 days instead of 365, because the extra February 29 day is added to the shortest month. The bonus day offsets the roughly 0.24 day difference between the calendar and the solar year.