Voltage Drop Calculator

Estimate wire voltage drop from current, length, and AWG.

Approximate ohms/1000 ft at 75°C. Not a substitute for code compliance or an electrician.

Voltage drop
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    How to use

    1. Enter supply voltage, load current, and one-way cable length.
    2. Pick AWG and copper or aluminum.
    3. Review drop in volts and percent.
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