Percentage Calculator
Calculate any percentage relationship: what is X% of Y, X is what % of Y, percentage increase or decrease, or the percentage difference between two values.
1. What is X% of Y?
30
20% of 150 = 30
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2. X is What % of Y?
20%
3. Percent Change (Increase or Decrease)
+25%
Increase from 80 to 100
Common Percentage Examples
| Question | Math | Answer |
|---|---|---|
| 15% of 60 | 60 × 0.15 | 9 |
| 20% off $80 | 80 − (80 × 0.20) | $64 |
| 25 is what % of 200? | 25 ÷ 200 × 100 | 12.5% |
| Increase from 50 → 75 | (75−50)/50 × 100 | +50% |
| Decrease from 100 → 80 | (80−100)/100 × 100 | −20% |
| What is 7% sales tax on $45? | 45 × 0.07 | $3.15 (total $48.15) |
FAQ
How do you calculate X percent of Y?
Multiply Y by X/100. For example, 20% of 150 = 150 × 0.20 = 30.
How do you find what percent X is of Y?
Divide X by Y, then multiply by 100. For example, 30 is what percent of 150? 30 ÷ 150 × 100 = 20%.
How do you calculate percentage increase?
((New − Old) ÷ Old) × 100. If a price goes from $80 to $100, the increase is (100−80)/80 × 100 = 25%.
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