How do I calculate percentage change?

((New Value − Old Value) / |Old Value|) × 100. A positive result is an increase; negative is a decrease.

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% Change

Calculate percentage increase, decrease, or apply a % change to a value.

Find the % change

Original value

New value

Apply a % change to a value

Starting value

Change (%)

Use negative for decrease

Percentage Change in Business and Finance

Percentage change is fundamental in reporting: revenue grew 15%, costs fell 8%, traffic increased 42%. Understanding whether a change is relative (%) or absolute (units) is essential for interpreting data correctly.

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