Volt Drop & Cable Size Calculator

    *For General Guidance Only



    Voltage:            Length of Cable M


  Suggested Min. Cable Size mm    

    Volt Drop volts.    Drop %    Load = amps.


Ohm's law states that the current through a conductor between two points is directly proportional to the potential difference across the two points. Introducing the constant of proportionality, the resistance, one arrives at the mathematical equation that describes this relationship.

V = I x R (Voltage = Current multiplied by Resistance)
R = V / I (Resistance = Voltage divided by Current)
I = V / R (Current = Voltage Divided by Resistance)
Knowing any two of the values of a circuit, one can calculate the third, using Ohm's Law.

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