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Percentage Change Calculator

Enter an old value and a new value to see the percentage change and whether it is an increase or a decrease. Calculated locally.

Values

Local

Result

Change
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Direction
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Difference
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FAQ

Common questions

Change% = (New − Old) ÷ |Old| × 100. A positive result is an increase, negative is a decrease.
Percentage change from zero is undefined, so the tool reports that instead of a misleading number.
Yes — a value that doubles shows +100%, tripling shows +200%, and so on.
No. All calculation happens in your browser.

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Private by design

This runs entirely in your browser

No file or text you enter here is uploaded. Encoding and decoding happen on your device using native browser APIs — close the tab and nothing remains on a server.

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