Percentage Calculator
Calculate percentages, increases and decreases instantly.
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How to Use
- 1Choose the type of percentage calculation.
- 2Enter your numbers.
- 3View the instant result.
Features
- What % is X of Y
- X% of Y
- Percentage increase / decrease
- Copy result
Example
Input
What is 15% of 200?
Output
30
Calculate what percentage one number is of another, find a percentage of a value, or calculate percentage increase/decrease, instantly in your browser.
Three percentage questions, answered
| Question | Formula | Example |
|---|---|---|
| What is X% of Y? | Y × X ÷ 100 | 15% of 200 = 30 |
| X is what % of Y? | X ÷ Y × 100 | 30 is 25% of 120 |
| % change from A to B | (B − A) ÷ A × 100 | 80 → 100 is a 25% increase |
Everyday uses
- Discounts: 30% off a 2,500 price saves 750, so you pay 1,750.
- Exam marks: 42 out of 60 is 70%.
- Salary changes: a raise from 50,000 to 54,000 is an 8% increase.
- Price changes and inflation: comparing this year's price with last year's.
- Tax and VAT: adding 13% VAT to 1,000 gives 1,130.
Percentage traps
Increases and decreases are not symmetrical. If a price rises from 80 to 100, that is a 25% increase. If it falls back from 100 to 80, that is a 20% decrease, because the starting value is different. Likewise, a 50% loss needs a 100% gain to get back to where you started.
Percent versus percentage points. If an interest rate rises from 4% to 5%, it has risen by one percentage point, but by 25% in relative terms. News reports often mix these up, and the difference matters.
Successive discounts do not add. 20% off followed by an extra 10% off is 28% off in total, not 30%, because the second discount applies to the already-reduced price.
To reverse a percentage, such as finding the price before 13% VAT was added, divide by 1.13 rather than subtracting 13%. 1,130 ÷ 1.13 = 1,000.