Leap Year Calculator – Check & Understand Leap Years
Wondering whether a specific year is a leap year, or simply curious about how many days a leap year contains? A Leap Year Calculator simplifies this by letting you enter a year and immediately finding out whether it has 366 days (i.e., is a leap year) or not.
Why Do Leap Years Exist?
A leap year happens because our Earth doesn’t orbit the Sun in exactly 365 days — it takes about 365 days and 6 hours. These extra hours add up over four years, which is why every fourth year we add an extra day to February (February 29).
However, the rules aren’t just “every 4 years”. Under the modern Gregorian calendar, a year is a leap year if it’s divisible by 4, unless it is also divisible by 100 — in which case it must be divisible by 400 to still qualify as a leap year. This ensures the calendar stays in sync with seasons over centuries.
How to Use the Calculator
- Enter the year you want to check.
- The tool instantly determines if it’s a leap year or a common year.
- Some calculators also allow entering a range (start year to end year) to list all leap years in that interval.
Understanding leap years is more than a quirky fact — it matters for scheduling, tech systems, calendars, and even birthday planning for people born on February 29.
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