What Percent Is X of Y
What percent is A of B. Whole cannot be 0.
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How to use What Percent Is X of Y
- Enter part, whole. Leave a field blank only when the page says the value is missing.
- Read the result rows under the form. Errors appear in the status line. Nothing is uploaded.
- Rounding follows IEEE floating point in this browser unless the page says it uses integers or BigInt.
What Percent Is X of Y
Part / whole × 100
| Computes | What percent is A of B. Whole cannot be 0. |
|---|---|
| Includes | Part / whole × 100 |
| Includes | Rejects a zero whole |
| Engine | percentage |
| Upload | None |
| Advice | Arithmetic only |
What What Percent Is X of Y is
Percent = 100 × part / whole. 30 is 15% of 200. If the whole is 0 the ratio is undefined and this page reports an error.
The formula runs in this tab. CZNull does not receive the numbers.
How this page computes
Use P percent of X when you already have the percent. Use percent change when a value moved from one number to another.
Entities and related jobs
What percent is A of B. Whole cannot be 0. Named features: Part / whole × 100, Rejects a zero whole.
See also Percentage Calculator, What Is P Percent of X, Percentage Change Calculator, Ratio Calculator, Scientific Calculator, Fraction Calculator.
Use cases
Test scores, win rates, and 'what share of the total is this line.' It is not a weighted grade book; use final grade when remaining work has a weight.
Limits
Invalid input appears in the status line. IEEE floating point applies unless a row says otherwise. CZNull does not receive the numbers.