Percentage difference measures the absolute difference between two values as a percentage of their average. Unlike percent change, it doesn't consider which value came first or the direction of change.
This calculation is useful when comparing two values where neither is considered the "original" or "starting" value, such as comparing test scores, product prices from different stores, or measurements from two sources.
Follow these steps to calculate the percentage difference between two values:
The result is always positive because it represents the magnitude of difference, not direction.
Problem: Store A sells a product for $40, Store B sells it for $50. What is the percentage difference?
Solution:
Percent change uses the original value as the denominator and shows direction (increase/decrease). Percentage difference uses the average of both values and always shows a positive result.
Use percentage difference when comparing two independent values where neither is considered the baseline, such as comparing prices from different stores or measurements from different sources.
Yes! If one value is zero and the other is non-zero, the percentage difference will be 200%.