Calculate the percentage difference of two numbers by dividing the difference of the numbers by their average. Multiply this answer by 100 to determine the percentage difference.Continue Reading
Subtract one of the values being compared from the other. If the difference is a negative number, use the absolute value by ignoring the negative sign for the rest of the calculation.
Add the two values together and divide by two to find their average. Divide the number found in Step 1 by the average of the values.
Multiply this value by 100 by moving the decimal point two places to the right. This is the percentage difference.