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Percentage Calculator

Result = percentage ÷ 100 × number.

Your inputs stay in your browser. No account required.
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How Percentage Calculator works

Result = percentage ÷ 100 × number.

Try an example

20% of 150 = 30.

Good to know

Uses double-precision arithmetic; displayed values are rounded to 13 significant digits.

Your privacy

Processing happens on this device for this tool. We do not upload your input, put it in share links or save it to your favourites. Closing this tab discards the working input; downloaded results remain wherever you save them.

When this tool is useful

Use the percentage calculator for a quick proportion, discount, markup or “what is X percent of Y?” check.

How to use it

  1. Enter the percentage and the number it applies to.
  2. Read the calculated amount and the formula shown below the tool.
  3. For a before-and-after comparison, use Percentage Change instead so the denominator is explicit.

Checks before you rely on the result

  • Percent means “per hundred”; a 15% increase and a 15 percentage-point change are not always the same thing.
  • Negative and decimal values can be meaningful, but the context determines whether they make sense.
  • The result is arithmetic, not a recommendation about pricing or finance.

This page is maintained with the tool implementation and its deterministic tests. If the result looks wrong, report the issue with a non-sensitive example.

Read the Percentage Calculator instructions

A useful next step

Mortgage Repayment Calculator
Percentage Change
Fraction Calculator
Made for clarity. Built to be useful.Report an issue