Find the percentage difference between two values relative to their average.
Percentage difference compares two values without treating either as the 'original'. It divides the absolute difference by the average of the two absolute values and multiplies by 100. This is symmetric — swapping A and B gives the same result.
Percentage Difference
Percentage Difference = (|A − B| / ((|A| + |B|) / 2)) × 100
Percentage change uses one value as the base (old→new). Percentage difference treats both values equally by dividing by their average, making it symmetric.
Yes, when one value is zero and the other is not, the percentage difference is exactly 200%. It cannot exceed 200% for non-negative values.