To find a percentage of a number, multiply the number by the percent and divide by 100. For example, 20% of 80 is 80 x 20 / 100 = 16. Use the calculators below for the three most common percentage questions, with the steps shown.
A percentage is a number out of 100. The three questions people ask most are:
| Question | Calculation | Answer |
|---|---|---|
| 10% of 50 | 50 x 10 / 100 | 5 |
| 25% of 80 | 80 x 25 / 100 | 20 |
| 15 is what % of 60 | 15 / 60 x 100 | 25% |
| 40 to 50 change | (50-40)/40 x 100 | +25% |
To find a quick 10%, move the decimal one place left (10% of 240 is 24). For a tip or discount, find 10% then scale: 20% is double the 10%, 5% is half of it. To reverse a percentage (a price after X% off), divide by (1 minus the percent as a decimal).
Multiply the number by the percentage and divide by 100. For example, 30% of 150 is 150 x 30 / 100 = 45.
Divide the first number by the second and multiply by 100. For example, 45 out of 150 is 45 / 150 x 100 = 30%.
Subtract the original value from the new value, divide by the original, then multiply by 100. A rise from 150 to 180 is (180 - 150) / 150 x 100 = 20% increase.
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