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Percentage calculator

Find a percentage of a number, or calculate what percentage one value represents.

Free. No account needed.

Optional equipment

An optional suggestion for your wider workspace: a security key can be used with online accounts that support it. This tool does not require one.

You do not need to buy anything to use this free tool.

As an Amazon Associate I earn from qualifying purchases.

Inputs are processed on your device. Check results before using them.

Formula, method and rounding

part × total / 100; 100 × part / total

Percent-of multiplies the percentage by the total. Part-as-percent divides the part by a positive total.

Currency follows the rule above; other numeric results display up to 12 significant digits. Inputs are limited by JavaScript number precision. Verify results before critical use.

Result

Enter your values. Your result will appear here.

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What can you do with your output?

Choose a related tool for your next task. These links do not transfer your file or inputs automatically; select your file in the next tool.

How it works

  1. Choose “percent-of” to find a percentage of a total, or “part-as-percent” to find the share a part represents.
  2. Enter the percentage or part in the first field and its total in the second. A part-as-percent total must be positive.
  3. Calculate and compare the operation: 20% of 150 is 30, while 20 as a share of 150 is about 13.33%.

Example & practical use

20% of 150 is 30.

Limits and help

Results use floating-point arithmetic; verify precision for critical work.

Your files are yours.

Image and text processing happens in your browser. Your files are not uploaded to our servers.

Troubleshooting

Check the unit for each field. Use a decimal point without thousands separators in numeric fields. A blank value is not the same as zero. Verify important results independently.

Report an issue and track its status · Contact · Contact

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