Leap Year Checker
Checks whether a year has 366 days. The rule has three parts: a year divisible by 4 is a leap year, unless it is divisible by 100, unless it is also divisible by 400. So 2024 is a leap year, 1900 was not, and 2000 was.
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Input
Result
- Target Year
- 2026
- Leap Year Status
- COMMON YEAR (365 Days)
- Is Divisible by 4
- No
- Is Century Year (100)
- No
- Is Exception (400)
- No
- Upcoming Leap Years
- 2028, 2032, 2036, 2040, 2044
About
What the Leap Year Checker does
That correction exists because the Earth's orbit takes about 365.2422 days, not 365.25. Adding a day every four years slightly overcorrects, so the century rule removes three leap days every 400 years to keep the calendar aligned with the seasons.
How it works
Using the Leap Year Checker
- 1Enter the year.
- 2Divisibility by 4 is checked first.
- 3If it is also divisible by 100 it is normally excluded.
- 4Unless it is divisible by 400, which restores it.
- 5The verdict is shown with the reasoning.
Use cases
What people use it for
- Checking whether February has 29 days in a given year
- Validating date handling in software
- Settling a question about a birth year
- Teaching the calendar rules
FAQ
Frequently asked questions
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