Question 1

What's the difference between percentage difference and percentage change?

Accepted Answer

Percentage change uses the old value as baseline (one-directional), while percentage difference uses the average (symmetric). From 100 to 150: change=50%, difference=40%.

Question 2

Why use the average as baseline?

Accepted Answer

Using the average ensures the difference is symmetric — A to B gives the same result as B to A. This is essential in scientific experiments and statistical analysis.

Question 3

Is my data uploaded to a server?

Accepted Answer

No. All calculations happen locally in your browser. No data ever leaves your device.

📊 Percentage Difference Calculator

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