Percentages Explained: Every Formula You Actually Need
Five formulas cover almost every percentage question anyone actually asks. Here they are, with the traps that make each…
Percentage Calculator
Every common percentage question in one place: percent of a number, percent change, increase, decrease and reverse percentages.
Result
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How to use the Percentage Calculator
- Fill in each field with your own figures — the defaults are only there as an example.
- The result updates as you type, so there is no button to press.
- Check the breakdown under the main result for the supporting numbers.
- Use the copy button to take the result with you, or share the link to reload the same inputs.
Percentage Calculator — frequently asked questions
Is this percentage calculator free to use?
Yes. Every calculator on the site is free, needs no sign-up, and runs entirely in your browser, so your figures never leave your device.
How accurate is the result?
The maths is exact for the formula shown on the page. Accuracy in the real world depends on your inputs and on assumptions the formula cannot see, so treat the output as a well-grounded estimate rather than a quote.
Can I use it on my phone?
Yes. The page is responsive, weighs a few kilobytes and works offline once loaded, so it behaves the same on a phone as on a desktop.
Related reading
Focused versions of this calculator
Each of these does one specific job with its own defaults and explanation.
- Percentage Increase Calculator Work out the percentage increase between two numbers, and see what the same rise looks li…
- Percentage Decrease Calculator Calculate the percentage drop between two values, and the rise it would take to get back …
- What Percent Is X of Y Calculator Find what percentage one number is of another — the calculation behind test scores, marke…
- Percent of a Number Calculator Find any percentage of any number instantly — 15% of a bill, 30% off a price, 7% of a tot…
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About this calculator
Written and reviewed by The Samsung Calculator editorial team. Every calculator is written against a published formula, reviewed against at least one independent reference implementation, and dated when it changes.
Last reviewed August 15, 2026 · Calculation runs client-side · No data collected · Report an error