Percentage Calculator
Compute a percentage of a value, or reverse the question: what percent is A of B. Useful for discounts, tax estimates, and score conversions.
Inputs
Result
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Frequently asked questions
- How do you calculate a percentage of a number?
- part = whole × (percent / 100). Example: 15% of 200 = 200 × 0.15 = 30.
- How do you find what percent one number is of another?
- percent = (part / whole) × 100. Example: 30 is what % of 200 → (30/200)×100 = 15%.
- Which mode should I use?
- Use “What is X% of Y?” for discounts/tax slices. Use “X is what % of Y?” when you already have both amounts.
- Why can Y not be zero in “is what %” mode?
- Dividing by zero is undefined. Enter a non-zero whole (Y).