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Percentage Difference Calculator
Compare two values symmetrically as a percentage of their average
About this calculator
Percentage difference compares two values without implying which came first. It uses the average of the two values as the reference point: |V1 − V2| / ((V1 + V2) / 2) × 100. This is useful when comparing two measurements, prices, or quantities where neither is the 'original'.
How to use
Comparing two products priced at 40 kr and 60 kr: difference = |40 − 60| / 50 × 100 = 40%. They differ by 40% relative to their average price.
Frequently asked questions
When should I use percentage difference instead of percentage change?
Use percentage difference when there is no clear 'before' and 'after' — for example, comparing two products, two cities, or two measurements taken at the same time. Use percentage change when one value clearly precedes the other in time or logic.