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Percentage calculator

Calculate common percentage changes. Simple, private, right in your browser.

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Save the inputs and settings you choose. Nothing is uploaded until you select Save.

Save a file to your 5 MB cloud space

Choose a file explicitly. Your tool’s open files are never uploaded automatically. PDF, PNG, JPEG, WebP, TXT, CSV and JSON are supported.

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A LITTLE GUIDANCE

How to use this tool

  1. Choose percent-of, percent-change or reverse percentage.
  2. Enter X and Y according to the selected expression.
  3. Calculate and copy the result.

A worked example

15% of 200 → 30; a change from 80 to 100 → 25%.

What to know

Percent change divides the difference by the absolute original value. A zero original value has no defined percentage change. Reverse percentage solves for the whole.

Supported inputs and limits

Finite numeric inputs from −10¹⁵ to 10¹⁵.

Where is my data processed?

In your browser. Cloud saving is optional: only the supported inputs, settings or files you explicitly choose are uploaded. Download or save anything you want to keep before closing the page. Read our privacy details.

Further reading

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