Most calculators are not set up well to do this. You would need to calculate 1/16 = 0.0625, so for 7' 3 1/16 you would need to do 7*12 = 84 inches + 3 inches + 0.0625 inches. For this calculator (new layout video here: ru-vid.com4ML0fiINRh8), you can simply tap the 7, then the 3, then the 1/16 button