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Percentage Change Calculator

Calculate the percentage change from an old value to a new value.

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01
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02
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03
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Percentage change calculator online

Compare a new price, count or measurement with its old value. A zero baseline has no defined percentage change; percentage points are a different calculation.

How to use it

Enter Amount / value or select Try example. Review New value. Select Calculate and inspect the result before copying or downloading.

Options and example settings

Option	Choices / value	Example default
New value	Enter a value	120

Calculation method

Percentage change = (new value − old value) ÷ old value × 100. For 100 → 120, the result is +20%; for 200 → 150, it is −25%. A zero old value has no defined percentage change. Moving from 10% to 12% is a rise of 2 percentage points and a relative increase of 20%.

Worked examples

Compare a new price, count or measurement with its old value.

Worked example — Percentage Change Calculator

Settings: New value: 120

Input:

Output:

Absolute change: 20
Percentage change %: 20

The example output has 2 lines. Compare its order, separators and whitespace with the input before copying the result.

Limitations and common mistakes

A zero baseline has no defined percentage change; percentage points are a different calculation.

Frequently asked questions

How can I compute a percentage increase or decrease online?

Enter Amount / value or select Try example. Review New value. Select Calculate and inspect the result before copying or downloading.

Where is my input processed?

The bundled tool processes input in your browser. It does not upload tool input to a conversion service. Other site plugins, analytics, advertising and browser extensions may have separate behavior.