Percentage Calculator
Five percentage questions in one calculator. Find a percentage of a number, work out what percentage one number is of another, or measure the increase or decrease between two values. Each answer comes with its working — the decimal, the fraction, or the absolute change — so you can sanity-check it rather than take it on trust.
15% of 200
30
- Remainder
- 170
- As a decimal
- 0.15
Nothing is uploaded — this tool runs inside your browser, so your files never leave your device.
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Why use this tool
- Five modes: percent of, percent is, percentage change, increase by, decrease by
- Shows the decimal and fraction behind the answer, not just the number
- Handles negative starting values when measuring change
- Runs in your browser — instant, and nothing is sent anywhere
How it works
- 1Choose which kind of percentage question you're asking.
- 2Type your two numbers into X and Y.
- 3Read the answer and its breakdown underneath.
Percentage Calculator — frequently asked questions
Divide the percentage by 100 and multiply by the number. 15% of 200 is 0.15 × 200 = 30. Choose 'What is X% of Y?' and the calculator shows both the answer and the decimal it used.
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