How to find 18 percent of 30
"Percent" means per hundred, so 18% is the fraction 18/100, or 0.18 as a decimal. Taking 18 percent of 30 means multiplying 30 by that fraction:
18% of 30 = 30 x 18 / 100
= 540 / 100
= 5.4The same answer comes from the decimal form: 30 x 0.18 = 5.4. And because multiplication is commutative, 18% of 30 equals 30% of 18, which is sometimes the easier way to see it in your head.
Mental math shortcut
10% of 30 is 3 (move the decimal one place left), and 1% is 0.3. Build 18% from those pieces: 1 x 3 + 8 x 0.3 = 5.4.
Nearby percentages of 30
| Percent | Of 30 | 30 minus it | 30 plus it |
|---|---|---|---|
| 1% | 0.3 | 29.7 | 30.3 |
| 5% | 1.5 | 28.5 | 31.5 |
| 10% | 3 | 27 | 33 |
| 13% | 3.9 | 26.1 | 33.9 |
| 15% | 4.5 | 25.5 | 34.5 |
| 17% | 5.1 | 24.9 | 35.1 |
| 19% | 5.7 | 24.3 | 35.7 |
| 20% | 6 | 24 | 36 |
| 23% | 6.9 | 23.1 | 36.9 |
| 25% | 7.5 | 22.5 | 37.5 |
| 30% | 9 | 21 | 39 |
| 36% | 10.8 | 19.2 | 40.8 |
18 percent of other amounts
| Amount | 18% of it |
|---|---|
| 10 | 1.8 |
| 20 | 3.6 |
| 25 | 4.5 |
| 40 | 7.2 |
| 50 | 9 |
| 60 | 10.8 |
| 75 | 13.5 |
| 80 | 14.4 |
| 100 | 18 |
| 120 | 21.6 |
Where this comes up
A 18% discount on a 30 price takes off 5.4, leaving 24.6. A 18% tip or tax on 30 adds 5.4, for a total of 35.4. If 30 is a score out of a possible total, 18% of it is the share 5.4 represents. For percent change, reverse percentages, and "X is what percent of Y", use the full percentage calculator.