How to find 18 percent of 100
"Percent" means per hundred, so 18% is the fraction 18/100, or 0.18 as a decimal. Taking 18 percent of 100 means multiplying 100 by that fraction:
18% of 100 = 100 x 18 / 100
= 1,800 / 100
= 18The same answer comes from the decimal form: 100 x 0.18 = 18. And because multiplication is commutative, 18% of 100 equals 100% of 18, which is sometimes the easier way to see it in your head.
Mental math shortcut
10% of 100 is 10 (move the decimal one place left), and 1% is 1. Build 18% from those pieces: 1 x 10 + 8 x 1 = 18.
Nearby percentages of 100
| Percent | Of 100 | 100 minus it | 100 plus it |
|---|---|---|---|
| 1% | 1 | 99 | 101 |
| 5% | 5 | 95 | 105 |
| 10% | 10 | 90 | 110 |
| 13% | 13 | 87 | 113 |
| 15% | 15 | 85 | 115 |
| 17% | 17 | 83 | 117 |
| 19% | 19 | 81 | 119 |
| 20% | 20 | 80 | 120 |
| 23% | 23 | 77 | 123 |
| 25% | 25 | 75 | 125 |
| 30% | 30 | 70 | 130 |
| 36% | 36 | 64 | 136 |
18 percent of other amounts
| Amount | 18% of it |
|---|---|
| 20 | 3.6 |
| 25 | 4.5 |
| 30 | 5.4 |
| 40 | 7.2 |
| 50 | 9 |
| 60 | 10.8 |
| 75 | 13.5 |
| 80 | 14.4 |
| 120 | 21.6 |
| 150 | 27 |
Where this comes up
A 18% discount on a 100 price takes off 18, leaving 82. A 18% tip or tax on 100 adds 18, for a total of 118. If 100 is a score out of a possible total, 18% of it is the share 18 represents. For percent change, reverse percentages, and "X is what percent of Y", use the full percentage calculator.