Percentage Calculator
Three ways to calculate percentages.
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What is X% of Y?
X is what % of Y?
Percentage Change
Difference
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Frequently Asked Questions
How do I calculate a percentage of a number?
Multiply the number by the percentage and divide by 100. Example: 15% of 200 = 200 × 15 / 100 = 30.
How do I calculate percentage change?
Percentage change = ((New - Old) / |Old|) × 100. Positive = increase, negative = decrease.
What is the difference between percentage and percentile?
Percentage is a portion of 100. Percentile indicates rank relative to others (85th percentile = scored higher than 85%).
How do I find what percentage one number is of another?
Divide the part by the whole and multiply by 100. Example: 30 is what % of 200? → (30/200) × 100 = 15%.
How do I reverse a percentage?
To find the original price before a discount: original = sale price / (1 - discount%). Before tax: original = total / (1 + tax%).