Percentage Calculator
Work out a percentage of a number, the percentage change between two values, or what percentage one number is of another. Free.
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Point your phone camera at the code to open this tool.
Work out a percentage of a number, the percentage change between two values, or what percentage one number is of another. Free.
How to use Percentage Calculator
- Open the toolNo signup and nothing to install; it works as soon as the page loads.
- Set “Work out”
- Set “Value A”
- Set “Value B”
- Read the resultChange any input and the result is recalculated immediately.
Worked example with the defaults
- 25% OF 200 · 25% × 200 = 50
- 50
Nothing you enter leaves your device
All of the work happens inside your browser. Whatever you type is never packaged up and sent to a server, and no request this page makes carries it.
That makes it safe for contract amounts, personal details and internal documents you would rather not hand to a third party — close the tab and it is gone.
What this tool does not do
Percentage Calculator only does what a browser can do on its own — it talks to no backend service. So it keeps no history for you and syncs nothing across devices; if you need a record, copy or download the result.
It is also not a substitute for professional judgement. For legal, medical or tax decisions, treat the output as a starting point rather than a final answer.
Frequently Asked Questions
- How do I calculate a percentage increase?
- Subtract the old value from the new one, divide by the old value, then multiply by 100. Choose "percent change" and the calculator does it for you.
- What is the difference between percent change and percentage points?
- Percent change compares two values relatively, while percentage points describe an absolute difference between two percentages.