Percentage Calculator
Calculate percentages, find what percent one number is of another, or work backward from a percentage.
Percentage Calculator
15% of 80 is 12 Use (15 / 100) x 80 = 12.
What Is a Percentage?
A percentage is a number out of 100. For example, 25% means 25 out of every 100 parts. Percentages are used for discounts, scores, taxes, tips, price changes, and many classroom word problems.
Percentage Formula
For the common question “What is P% of N?”, use:
answer = (P / 100) x NFor the question “A is what percent of B?”, use:
percentage = (A / B) x 100Worked Examples
| Problem | Steps | Answer |
|---|---|---|
| What is 15% of 80? | (15 / 100) x 80 | 12 |
| What is 25% of 240? | (25 / 100) x 240 | 60 |
| 18 is what percent of 72? | (18 / 72) x 100 | 25% |
| 45 is 30% of what number? | (45 / 30) x 100 | 150 |
Common Uses
- Finding discounts before buying something.
- Checking a test score or practice score.
- Comparing price, salary, or investment changes.
- Solving school percentage word problems.
FAQ
How do I calculate 10% quickly?
Move the decimal point one place left. For example, 10% of 360 is 36.
How do I calculate 25% quickly?
25% is one fourth, so divide the number by 4.
Can this be used for financial decisions?
The percentage math is exact. For important financial decisions, check the full numbers (fees, taxes, and changing rates) independently before acting.