How Much is (p)% of (x)? — Percent of a Number Calculator
Use this calculator to find a percentage of any number instantly. Whether you are calculating a discount, tip, tax, or commission, this tool gives you the exact portion in seconds.
What does "percent of a number" mean?
A percentage is a fraction of 100. When you ask "what is 20% of 150?", you are asking for 20 parts out of every 100 parts of 150. The answer tells you a proportional share of the total.
Formula
Where p is the percentage and x is the number.
Step-by-step example
Question: What is 15% of 200?
- Convert the percentage to a decimal: 15 ÷ 100 = 0.15
- Multiply by the number: 0.15 × 200 = 30
So 15% of 200 = 30.
Common real-world uses
| Scenario | Calculation | Result |
|---|---|---|
| 18% tip on a $45 bill | 18% × 45 | $8.10 |
| 30% discount on $120 shoes | 30% × 120 | $36 off |
| 8.5% sales tax on $200 | 8.5% × 200 | $17 |
| 5% commission on $8,000 sale | 5% × 8000 | $400 |
| 12% annual interest on $5,000 | 12% × 5000 | $600/year |
Frequently asked questions
How do I calculate 10% of a number quickly?
Move the decimal point one place to the left. For example, 10% of 350 = 35.
What is 25% of a number?
Divide the number by 4. For example, 25% of 200 = 200 ÷ 4 = 50.
How is this different from percentage change?
Percent of a number gives you a portion of a value. Percentage change compares two values to find how much something grew or shrank.