Cable Size Calculator

Use this online tool to calculate the required cable size based on the input parameters

This online electrical calculator aids in determining the gauge or size of copper or aluminum wires required for an electrical circuit.

Source Voltage
Namber of Phases
Amperes
amps
Distance
Voltage Drop
volts
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    9 Number of calculations

    Single Phase

    Wire Circular Mils = 2 x Specific Resistance x Amperes x Distance / (Voltage Drop / Source Voltage)

    Three Phase

    Wire Circular Mils = 2 x 0.866 x Specific Resistance x Amperes x Distance / (Voltage Drop / Source Voltage)

    where,

    • Specific Resistance = 11.2 for Copper Cable,
    • Specific Resistance = 17.4 for Aluminium Cable,