Percentage Difference Calculator
Find the percentage difference between two values relative to their average.
Inputs
Percentage Difference
28.5714%
Absolute Difference
10.0000
Average of |A| and |B|
35.0000
Step by step
Find absolute difference
|30 − 40|
= 10
Find average of absolute values
(|30| + |40|) / 2
= 35
Divide and multiply by 100
(10 / 35) × 100
= 28.5714%
How it works
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.
Formula
Percentage Difference
Percentage Difference = (|A − B| / ((|A| + |B|) / 2)) × 100
- A
- First value
- B
- Second value
Frequently Asked Questions
How is percentage difference different from percentage change?
Percentage change uses one value as the base (old→new). Percentage difference treats both values equally by dividing by their average, making it symmetric.
Can percentage difference exceed 200%?
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.