Percentage of a Number
To find a percentage of a number, multiply the number by the percent and divide by 100. Enter the percent and the number to get the answer, plus the number increased and decreased by that percent.
Your numbers
Result
- Number + percent
- 92
- Number - percent
- 68
| Percent | Amount |
|---|---|
| 5% | 4 |
| 10% | 8 |
| 15% | 12 |
| 20% | 16 |
| 25% | 20 |
| 50% | 40 |
How to find a percent of a number
Multiply the number by the percent, then divide by 100: 15% of 80 is 80 x 15 / 100 = 12. A quick shortcut for 10% is to move the decimal one place left (10% of 80 = 8), then scale from there — 5% is half of that, 20% is double.
Adding or subtracting the percent
For a tip or markup, add the percent back: 80 + 15% = 92. For a discount, subtract it: 80 - 15% = 68. The calculator shows both, so it doubles as a quick tip and sale-price tool.
Frequently asked questions
Sources
- Percentage arithmetic (part = whole x percent / 100)
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