The answer is 13.5. Below: three ways to calculate it, a mental shortcut, and the real-world contexts where this percentage shows up.
18% of 75 is 13.5.
18% tip on a 75-dollar bill is an "average" service tip in many US restaurants.
Divide the percent by 100 to convert it: 18 ÷ 100 = 0.18.
Multiply: 75 × 0.18 = 13.5.
18% means 18/100. So 18% of 75 is (18 × 75) ÷ 100.
Compute: 18 × 75 = 1350, then divide: 1350 ÷ 100 = 13.5.
For 18%, find 20% (10% doubled), then subtract 10% of itself. 20% of 75 is 15; remove 10% of 15 to get 13.5.
Restaurants in the US typically expect 15–20% tip. The math is the same regardless of percentage — you can apply this same procedure to figure tips, sales tax, discounts, or any other percentage.
If your meal cost $75 and you want to leave a 18% tip, the tip amount is $13.5. Your total bill becomes $88.5.
If you only needed to look up this one number, here are some related ones using the same base of 75:
| Calculation | Answer |
|---|---|
| 10% of 75 | 7.5 |
| 15% of 75 | 11.25 |
| 20% of 75 | 15 |
| 25% of 75 | 18.75 |
| Calculation | Answer |
|---|---|
| 18% of 10 | 1.8 |
| 18% of 15 | 2.7 |
| 18% of 18 | 3.24 |
| 18% of 20 | 3.6 |
| 18% of 25 | 4.5 |
For any percentage of any number, use our percentage of a number calculator.
Multiply 75 by 0.18 (the decimal form of 18%). Or equivalently, multiply by 18/100. The result is 13.5.
Divide 13.5 by 75 and multiply by 100. That is exactly 18% — confirming the original calculation.
20% of 75 is 15. That makes the total $90.