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Percentage Change Calculator

Measure a relative increase or decrease from one value to another.

Result25.00% increase.A concise view of the relative increase or decrease between both values.

Calculations happen locally in your browser.

How to use this calculator

  1. Enter the starting and new values. The start cannot be zero.
  2. Review the live result and use Copy result when you need to share it.

How the calculation works

The difference is divided by the absolute starting value and multiplied by 100.

Formula

Change % = (new − original) ÷ |original| × 100

Step-by-step calculation

  1. Enter the starting and new values. The start cannot be zero.
  2. The difference is divided by the absolute starting value and multiplied by 100.
  3. Check the displayed result, then copy it if needed.

Worked example

A change from 80 to 100 is a 25% increase.

Risk guidance

Frequently asked questions

Does this tool send my inputs anywhere?

No. The interactive calculation runs in your browser and this site does not submit tool inputs to a backend.

How should I use the result?

Check that the entered units and values match your situation, especially around dates, breaks, and rounding.

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