Percentage Change Calculator
Measure the percentage increase or decrease between two values.
Result—
Enter values above.
Measure the percentage increase or decrease between two values.
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Content reviewed: 24 September 2026
Measure the percentage increase or decrease between two values. Use the controls above to enter the values or text required by this specific tool, then review the result together with the method and limitations shown on the page.
From 80 to 100: (20 ÷ 80) × 100 = 25%
For information about calculation checks, browser-side processing and external services, see Methodology & Accuracy.