Percentage Calculator
Three of the sums people actually need, in one place.
Runs entirely in your browser. Nothing you enter is uploaded or stored.
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Fill in both boxes.
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How to use the Percentage Calculator
- Pick the sum you need from the three tabs.
- Fill in the two numbers.
- The answer appears as you type, with the working shown underneath.
Questions people ask
What is the difference between percentage change and percentage points?
If a rate goes from 5% to 7%, that is a rise of 2 percentage points but a 40% increase. Both are correct; they answer different questions. This calculator gives the percentage change.
Why is a 50% rise not cancelled by a 50% fall?
Because each is measured against a different starting number. 100 rises by 50% to 150, and 150 falls by 50% to 75. To get back to where you started after a 50% rise you need a 33.3% fall.
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