How to Calculate Conductor Diameter from Wire Diameter

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To calculate the nominal diameter of any concentric-lay-stranded conductor made from round wires of uniform diameters, multiply the diameter of an individual wire by the applicable factors listed below:

Number of Wires in Conductor Factor to Calculate Conductor Diameter
3 2.155
7 3.000
12 4.155
19 5.000
37 7.000
61 9.000
91 11.000
127 13.000
169 15.000
217 17.000
271 19.000
For a greater number of wires use the formula:
Conductor Diameter = Wire Diameter x SQRT (1.332 x No. of Wires)