How to find a percentage of a number
Divide the percentage by 100 to turn it into a decimal, then multiply it by the number.
percentage of a number = (percentage / 100) x numberFor 15% of 200, 15 / 100 = 0.15, and 0.15 x 200 = 30.
Worked examples
| Question | Working | Answer |
|---|---|---|
| 15% of 80 | 0.15 x 80 | 12 |
| 20% of 50 | 0.20 x 50 | 10 |
| 7.5% of 240 | 0.075 x 240 | 18 |
| 150% of 40 | 1.5 x 40 | 60 |
| 0.5% of 2,000 | 0.005 x 2,000 | 10 |
A percentage above 100% gives a result larger than the number you started with.
Add or subtract the percentage
Below the answer, the calculator also shows the number plus the percentage and the number minus the percentage. This is what you need for a price with tax or a price after a reduction. A tax rate of 5%, for example, on 200 is 10, so the price with tax is 210. For full sale and tax calculations, use the percent off calculator.
Table of common percentages
The table below the calculator lists 1% to 200% of your number. It is handy when you need several percentages of the same amount, such as a range of discounts or commission rates.
Mental maths shortcuts
- 10%: move the decimal point one place to the left. 10% of 340 is 34.
- 5%: half of 10%. 5% of 340 is 17.
- 1%: move the decimal point two places to the left.
- 15%: 10% plus 5%. 15% of 340 is 34 + 17 = 51.
- 25%, 50%, 75%: a quarter, a half and three quarters.
The same calculation in code and spreadsheets
Excel and Google Sheets: =A1*15% or =A1*0.15
JavaScript: const result = number * percent / 100;
Python: result = number * percent / 100Other percentage questions
To find what percent one number is of another, or the number when you know a percentage of it, use the percentage calculator, which has a calculator for each question. To compare two values, see percentage change, percentage increase, percentage decrease and percentage difference.