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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
15.88 mm

5/8 in = 15.88 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 5/8 in = 0.625 in
  2. Multiply by 25.4 0.625 × 25.4 = 15.88 mm
Picture it

The 5/8 in mark is 15.88 mm from the end of the tape.

Nearby values

Inches Millimeters Centimeters Inches
7/16 in 11.11 mm 1.11 0.44
1/2 in 12.7 mm 1.27 0.5
9/16 in 14.29 mm 1.43 0.56
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

Printed from rocketcalc.io/length/inch-fractions-to-mm/5-8