Leap Year Calculator
Check if a year is a leap year and find the next and previous leap years.
Assumptions used in this calculation
- Calendar: Uses Gregorian calendar leap year rules: divisible by 4, except century years, unless also divisible by 400.
About this calculator
The leap year rule isn't just "every 4 years", century years like 1900 break that pattern unless they're also divisible by 400, which trips people up whenever a year ending in 00 comes into question, and remembering the full rule correctly under pressure is harder than it sounds. This calculator checks whether a given year is a leap year by applying the actual Gregorian calendar rule (divisible by 4, except century years, unless also divisible by 400), and also finds the nearest leap years immediately before and after it. It's useful for verifying whether February has 29 days in a specific year for planning purposes, settling a factual question about a particular year, or checking a date calculation that depends on knowing whether a leap day falls within a range.
Worked example
2024
Result: Yes, 366 days
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