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Find the sentence that matches what you want to know: a percent of a number, a percentage change and so on.
Free Percentage Calculator
Fill in the numbers in plain sentences – what is 15% of 80, 30 is what percent of 120, the change from 50 to 65 – and read the answer right away. Each answer shows the working, so you can check it or copy it.
Open Percentage Calculator →How to calculate percentages
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Type into the boxes in the sentence. Decimals and negative numbers work.
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The answer and its working update as you type. Copy it with one click.
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Percentage Calculator FAQ
How do I calculate a percentage of a number?
Divide the percent by 100 and multiply by the number. 15% of 80 is 15 ÷ 100 × 80 = 12.
How do I find what percent one number is of another?
Divide the part by the whole and multiply by 100. 30 out of 120 is 30 ÷ 120 × 100 = 25%.
How is percentage change calculated?
Subtract the old value from the new one, divide by the old value and multiply by 100. From 50 to 65 is (65 − 50) ÷ 50 × 100 = 30%. A negative result is a decrease.
What is the difference between percentage change and percentage difference?
Percentage change measures a move from an old value to a new one. Percentage difference compares two values that are on an equal footing, by dividing the gap by their average: between 10 and 15 it is 5 ÷ 12.5 × 100 = 40%.
How do I remove a percentage, like tax, from a total?
Divide the total by 1 plus the percent as a decimal. $92 including 15% tax is 92 ÷ 1.15 = $80. Use the Value before a change card.
Why can't I divide by zero?
Some questions have no answer for zero: no number is “what percent of 0”, and a change from 0 has no percentage. The card says so instead of showing a wrong number.
Is it free?
Yes. No sign-up, no limits. It works in your browser and remembers your numbers.
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