Leap Year Check
Check whether a year is a leap year and how many days it has.
About Leap Year Check
A year is leap when it is divisible by four, except century years which must also be divisible by four hundred. The leap rule keeps the calendar aligned with the solar year, and it decides whether February has 28 or 29 days.
Formula
Leap Year Check
Leap year = divisible by 4 but not by 100, unless also divisible by 400
- divisible
- Year evenly divides by the given number
Worked example
With the default values below, Leap Year Check returns Leap Year? of Yes. Change any input above and every figure here is recalculated in your browser.
Inputs used
- Year
- 2,024
Results
- Leap Year?
- Yes
- Days in Year
- 366
- Leap Indicator
- 1
Step by step
- 1Values used
- 2Leap Year Check
- 3Leap Year?= Yes
- 4Days in Year= 366
- 5Leap Indicator= 1
Assumptions and limits
- The result is derived only from the single input listed above. Anything not among them is not part of the calculation.
- In particular, this calculator does not take inflation, tax, fees or charges or compounding frequency into account.
- Figures are rounded for display to whole numbers, so totals built from several rounded parts can differ slightly from the unrounded arithmetic.
How these calculators are built and tested is described on the Methodology page. If a figure looks wrong, please report it.
Frequently Asked Questions
How is Leap Year Check calculated?
Leap year = divisible by 4 but not by 100, unless also divisible by 400 A year is leap when it is divisible by four, except century years which must also be divisible by four hundred.
Why does Leap Year Check matter?
The leap rule keeps the calendar aligned with the solar year, and it decides whether February has 28 or 29 days.
What values do I need to enter?
This calculator takes 1 input: Year. The pre-filled defaults are a realistic starting point — replace them with figures from your own environment for a result you can act on.