How to Convert 20 Gauge to Millimeters

Written by rick paulas
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Wire "gauge" is a system of measurement used to measure the diameter of certain electricity-conducting wiring. Other names for it include "American wire gauge" and "standardized wire gauge." There are 40 different gauge sizes, ranging from "0000," the smallest, to 36, the largest. With a little work, wire gauge sizes can be converted to millimeters.

Skill level:


  1. 1

    Subtract the number of the wire gauge you want to convert to millimeters, in this case, 20, from 36. This equals 16.

  2. 2

    Divide 16 by 39. This equals 0.410256. Thirty-nine represents the amount of "steps" in between the various gauges, or the spaces between the 40 different gauge sizes.

  3. 3

    Multiply 92 by the power of 0.410256. This equals 6.3921. Ninety-two is the ratio of the diameters of the 40 different gauge sizes.

  4. 4

    Multiply 6.3921 by 0.127 mm, the diameter of 36-gauge wire. That equals 0.8117 mm, which is the diameter of a 20-gauge wire.

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