Leap Year Calculator
Year
A leap year has 366 days — February gets a 29th day. The Gregorian rule corrects for Earth's actual orbital period of 365.2425 days.
- 1Divisible by 4 → usually a leap year
- 2Divisible by 100 → NOT a leap year (century exception)
- 3Divisible by 400 → IS a leap year (override century rule)
- 42000: yes; 1900: no; 2100: no; 2400: yes
2024=Divisible by 4; not a century → Leap year ✓
2100=Divisible by 100 but not 400 → NOT a leap year ✗
| Year | Leap year? | Why |
|---|---|---|
| 2020 | Yes | ÷4; not century |
| 2000 | Yes | ÷400 |
| 1900 | No | ÷100 but not ÷400 |
| 2100 | No | ÷100 but not ÷400 |
| 2400 | Yes | ÷400 |
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