Cable Size Calculator in AWG
Calculating Wire/Cable Size formula for single Phase Circuits
Wire Circular mils =2 x ρ x I x L / (%Allowable Voltage drop of source voltage)
Calculating Wire/Cable Size formula for Three Phase Circuits
Wire Circular mils =√3 x 2 x ρ x I x L / (%Allowable Voltage drop of source voltage)
ρ = Specific resistance or resistivity of Conductor
D = Distance in Feet (One way) i.e. ½ the total circuit length
I = Load Current
Note: the Value of ρ = Specific resistance or resistivity of Conductor is used here for copper and aluminum is 12.9 and 21.2 respectively at 75°C (167°F).
- Also check the “Good to know” Section after the calculator
Enter value, And click on calculate. Result will show the required quantity.
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Good to Know:
If the wire size is greater than all gauges (i.e 0000 is largest one size of wire in), then electrical engineer measure it in CM, kCM or MCM instead of inches, because inch is a small unit of these kinds of wires. Where;
A circular mil (CM) is a unit of circular area with a diameter of one mil (one thousandth of an inch). It corresponds to 5.067×10-4 mm².
1000 CM (circular mils) = 1 MCM or 1 kcmil = 0.5067 mm², so 2 kcmil.
It is a unit for referring to the area of a wire with a circular cross section.
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