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Fractional inches to millimeters

Convert tape-measure fractions like 3/8 or 1 5/16 inch to millimeters, with the math shown step by step.

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Millimeters
20.64 mm

13/16 in = 20.64 mm

Also equals

How it works

mm = in × 25.4

Turn the fraction into a decimal first: divide the top number by the bottom number and add any whole inches. One inch is exactly 25.4 millimeters, so multiply by 25.4.

  1. Turn the fraction into a decimal 13/16 in = 0.8125 in
  2. Multiply by 25.4 0.8125 × 25.4 = 20.64 mm
Picture it

The 13/16 in mark is 20.64 mm from the end of the tape.

Nearby values

Inches Millimeters Centimeters Inches
5/8 in 15.88 mm 1.59 0.63
11/16 in 17.46 mm 1.75 0.69
3/4 in 19.05 mm 1.91 0.75
13/16 in 20.64 mm 2.06 0.81
7/8 in 22.23 mm 2.22 0.88
15/16 in 23.81 mm 2.38 0.94
1 in 25.4 mm 2.54 1

Printed from rocketcalc.io/length/inch-fractions-to-mm/13-16