Percentage Calculator — X is what % of Y
CalculatorA percentage calculator finds the ratio (%) from a part (X) and a whole (Y): X is what percent of Y.
What is it
A percentage expresses a part relative to a whole of 100. Given part X and whole Y, the percent is (X/Y)×100; given a whole and a rate, the part is whole × rate ÷ 100. It covers everyday cases such as discounts, raises, percent change, and score conversion.
percent(%) = (part / whole) × 100
How to use
- 1Enter the part (X).
- 2Enter the whole (Y).
- 3Press calculate to see the percentage.
Reference
| Part | Whole | Result(%) |
|---|---|---|
| 25 | 200 | 12.5 |
| 50 | 200 | 25 |
| 75 | 150 | 50 |
| 33 | 300 | 11 |
| 120 | 80 | 150 |
Sources & standards
- Percent - Wolfram MathWorld
FAQ
25 is what percent of 200?
(25 / 200) × 100 = 12.5%.
What is 12.5% of 200?
200 × 12.5 ÷ 100 = 25.
How do I take 10% off a price?
Multiply by 0.9. Example: 10% off $45 is 45 × 0.9 = $40.50.
How is percent change calculated?
(new − old) ÷ old × 100. Example: going from 200 to 250 is (250−200) ÷ 200 × 100 = +25%.
What is the difference between % and percentage points?
Percent is a ratio; percentage points are the arithmetic difference between two ratios. Rising from 30% to 40% is a 10-point increase, which is a 33.3% relative increase.