About this calculator
Calculate symmetric percentage difference between two values.
Use percentage difference when neither value is naturally the original/baseline.
Formula
Percentage difference = |A − B| ÷ ((|A| + |B|)/2) × 100.
Example
80 vs 100 = 22.22% difference.
Accuracy
NUMTX shows the assumptions next to the calculation so you can replace defaults with values that match your situation. For measurements, supplier rates, fees, interest, tax or regulated work, confirm important figures with the appropriate official or professional source.