Percentage
Difference.
Find the symmetric percentage difference between two values — the absolute difference divided by their average, useful when neither value is "more original" than the other.
// Percentage Difference
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Enter two values to compute.
Absolute Diff—
Average—
Formula
% Difference = |V₁ − V₂| / ((|V₁| + |V₂|) / 2) × 100
Why average?
Unlike percent change, percentage difference is symmetric — it doesn't matter which value you put first. Dividing by the average keeps the result the same when V₁ and V₂ swap.