Leap Year Checker
Instantly verify if any year is a leap year based on the Gregorian calendar rules.
Instantly verify if any year is a leap year based on the Gregorian calendar rules.
A standard calendar year has 365 days. However, it actually takes the Earth approximately 365.24 days to orbit the sun. To keep our modern Gregorian calendar perfectly aligned with the astronomical seasons, we add an extra day—February 29th—to the calendar almost every four years. A year containing this extra day is called a leap year and has 366 days.
You might think a leap year simply occurs every four years, but the math is slightly more complex to account for the exact length of the solar year. Our Leap Year Calculator uses the following strict rules:
For example, the year 2000 was a leap year because it is divisible by 400. However, the year 2100 will not be a leap year, because it is divisible by 100 but not 400.
Leap years generally happen every four years. Recent and upcoming leap years include 2020, 2024, 2028, and 2032. You can use the tool above to calculate the exact next leap year from any point in time.
People born on leap day are often referred to as "leaplings" or "leapers." In non-leap years, they typically celebrate their birthday on either February 28th or March 1st.
No, the year 2100 will not be a leap year. Even though 2100 is divisible by 4, it is also a century year (divisible by 100). Century years must also be divisible by 400 to be considered a leap year, and 2100 is not.