**Introduction:** Determine whether a given year is a leap year with this easy-to-use HTML and JavaScript calculator. Leap years have an extra day in February, making them important for various date-related calculations.

**Formula:** A year is a leap year if it is divisible by 4 but not divisible by 100, except when it is divisible by 400.

**How to Use:**

- Enter the year you want to check.
- Click the “Check Leap Year” button.
- The result will indicate if the year is a leap year or not.

**Example:** If you enter the year 2024, the calculator will output “Leap Year!”

**FAQs:**

**Q: Why do we have leap years?**- A: Leap years are added to keep our calendar year synchronized with the astronomical year, compensating for the Earth’s orbit around the sun.

**Q: How often do leap years occur?**- A: Leap years occur every four years.

**Q: Is the formula for leap years accurate for all years?**- A: The formula works well for most years, but there are exceptions. For example, the year 1900 is not a leap year despite being divisible by 4.

**Q: Can I use this calculator for any historical or future year?**- A: Yes, you can use this calculator for any year.

**Q: How do leap years affect calendars and timekeeping?**- A: Leap years ensure that our calendars stay aligned with the Earth’s revolutions around the sun, preventing seasonal drift.

**Conclusion:** This calculator provides a quick way to determine whether a given year is a leap year or not. Understanding leap years is essential for accurate date calculations and timekeeping. Check any year with this straightforward tool.