In a perfect world, whenever I need to calculate a percent, the biggest number would be on the bottom. A=3, B=4 A/B = 3/4 = 0.75 * 100 = 75% Wonderful - I can easily know I am 25% away from 100%. Unfortunately, I often have the numbers swapped (A is bigger than B): A=4, B=3 A/B = 4/3 = 1.333333 * 100 = 133% Not wonderful - it is now 33% away from 100% Is it possible to do one calculation to give me 25% in both scenarios? I've toyed with many "stupid" ideas like: abs(A-B) / ((A+B)/2) I would even be happy to have something log/exp based rather than percent. As long as the result could be used to compare A and B, and then also C and D, etc. Thanks for any help and ideas.