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Percentage change calculator

Calculate percentage increase or decrease between an original and new value, alongside the absolute change.

Free · No signup · Processed in your browser

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How to use this calculator

  1. Enter values with a consistent currency and reporting period.
  2. Calculate to see the result and supporting figures.
  3. Review the formula and assumptions before using the result.

The formula, explained

(New − original) ÷ original × 100

Percentage change compares a new value with a positive starting value. Moving from 800 visits to 1,000 visits is a 25% increase. Moving back from 1,000 to 800 is a 20% decrease because the baseline changes.

Example inputs: original value 800; new value 1,000. Result: 25 %.

What to check before using the result

The percentage change from zero is undefined. This calculator also rejects a negative baseline because the usual growth interpretation becomes misleading. Compare equal reporting periods and consistent visitor definitions.

BEFORE YOU GO

Your work stays yours.

Are my files, text or numbers uploaded?
No. This tool processes the input in your browser tab. It does not send your input to our servers. Leaving or refreshing the page clears the working input.
Do I need an account or subscription?
No account is required for this public tool. You can complete the task and download the result directly. An account is useful when you want to measure visits to your own website or manage tracked campaign links.
Can I share or link to this tool?
Yes. Use the tool link below in a tutorial, team resource list or campaign checklist. The link opens an empty tool; your private input is not included.
USEFUL THINGS ARE WORTH SHARING

Bring this tool to your website.

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Get the embed code

Paste into an HTML block. The small helper fits the height as the tool changes. Inputs stay in the visitor’s browser, and the tool includes a source link. Your site must allow iframes and the helper script from visitortrack.ing.

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