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Percentage Change Calculator

Calculate percentage change between an old value and a new value, including increases and decreases.

Measure relative change from a starting value to a new value and see the result as a percentage.
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Calculators

Free  ·  Local browser processing  ·  No signup

What this tool helps you do

Measure relative change from a starting value to a new value and see the result as a percentage.

This page uses the same tested Percentage Calculator engine as the main tool, but focuses on this specific task so you can get straight to the relevant workflow without hunting through a generic converter.

How to use it

  1. Paste or enter the content you want to process in the tool above.
  2. Use the preselected mode when this task has a specific mode, then click Run.
  3. Review the output, then copy or download it if the tool provides a download option.

Common uses

  • Price changes
  • Traffic or revenue changes
  • Performance comparisons

Example

Input: From 80 to 100

Expected result: 25% increase

Useful tip

Percentage change uses the original value as the denominator, so a change from zero is undefined.

Frequently asked questions

Is this tool free?

Yes. The tool is free to use, requires no account and runs directly in your browser.

Is my input uploaded to a server?

No. The tool processes the input locally in your browser. Your tool input is not sent to ToolboxApp servers.

When should I use Percentage Calculator?

Price changes, traffic or revenue changes, or performance comparisons.