Percent Difference Calculator
Calculate the symmetric percent difference between two values, using their average as the base.
Percent Difference
40.00%
How This Works
Percent difference compares two values symmetrically — neither is treated as "before" or "after." It divides the absolute gap between them by their average, so swapping the two values gives the same result.
Formula
Percent Difference = |A − B| ÷ ((A + B) ÷ 2) × 100
Example
40 and 60 have a percent difference of 40% — the 20-point gap divided by their average of 50.
Frequently Asked Questions
What is the percent difference between 40.00 and 60.00?
40.00%.
How is percent difference different from percent change?
Percent change uses one value as a fixed "before" baseline (order matters). Percent difference treats both values symmetrically using their average as the base (order doesn't matter).