How do you convert inches to decimal numbers?

Answer:
Example: 3 13/16"
13 divided by 16 = 0.8125"
3.0" + 0.8125" = 3.8125"
3 and 13/16 of an inch . 1 inch = 25.4 mm. so 3x25.4=76.2 . now for the fractions.13 divided 16 = 0.8125 x 25.4=20.6 now add 76.2 and 20.6 and you've got your answer in mm
First answer by Pollock. Last edit by Pollock. Contributor trust: 16 [recommend contributor recommended]. Question popularity: 30 [recommend question].