Percentage
Calculator
Three tools: find X% of a number, what percent one number is of another, or the percentage change between two values.
What is X% of Y?
What is X% of Y?
Result
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X is what % of Y?
X is what percent of Y?
Result
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% Change
Percent change from X to Y
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How to Calculate Percentages
What is X% of Y?
Multiply the number by the percentage, then divide by 100. Use this for tips, discounts, tax, and commission calculations.
Formula: result = (X ÷ 100) × Y
Example: 20% of 150 = (20 ÷ 100) × 150 = 30
X is what percent of Y?
Divide the part by the whole, then multiply by 100. Use this to find test scores, market share, or completion percentages.
Formula: percentage = (X ÷ Y) × 100
Example: 30 is what % of 120? = (30 ÷ 120) × 100 = 25%
Percentage Change
Subtract the old value from the new, divide by the absolute old value, multiply by 100. Positive = increase, negative = decrease.
Formula: change = ((new − old) ÷ |old|) × 100
Example: from 80 to 100 = ((100 − 80) ÷ 80) × 100 = +25%
Common Calculations
| Question | Answer |
|---|---|
| What is 15% of 200? | 30 |
| What is 20% of 500? | 100 |
| What is 10% of 1,000? | 100 |
| What is 25% of 400? | 100 |
| What is 30% of 90? | 27 |
| What percentage is 25 of 200? | 12.5% |
| What percentage is 75 of 300? | 25% |
| What percentage is 120 of 400? | 30% |
| Percentage change from 80 to 100? | +25% |
| Percentage change from 200 to 150? | −25% |
Frequently Asked Questions
20% of 150 is 30. Calculated as (20 ÷ 100) × 150 = 30. Use the "What is X% of Y?" calculator above and enter 20 and 150.
See Real Results
Percentages power investment returns. See how real investments have compounded over time.