Percentage calculator
Answer the everyday percentage questions in one place: what is X% of Y, X is what percent of Y, the percentage increase or decrease from one number to another, and the original value before a percentage change. Each answer shows the formula used.
How to use the Percentage Calculator
- 1Pick the question you want to answer, such as "What is X% of Y?" or "Percentage change".
- 2Type the two numbers. The answer updates as you type.
- 3Read the formula under the result to see how it was worked out.
- 4Copy the answer, or switch questions; your numbers carry over where they fit.
Frequently asked questions
How do I calculate a percentage of a number?
Multiply the number by the percentage and divide by 100. 15% of 200 is 200 × 15 ÷ 100 = 30.
How do I work out what percentage one number is of another?
Divide the part by the whole and multiply by 100. 30 out of 200 is 30 ÷ 200 × 100 = 15%.
Why isn't a 50% increase cancelled out by a 50% decrease?
Because the second percentage is taken from a different number. 100 up 50% is 150, and 150 down 50% is 75. To get back to 100 from 150 you need a 33.3% decrease.
What's the difference between percentage change and percentage points?
If a rate goes from 4% to 5%, it rose by 1 percentage point, but by 25% in relative terms (1 ÷ 4). Use points for the gap between two percentages, and percentage change for growth.
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