Wire Resistance

Find resistance, voltage drop, and power loss for electrical wires

This calculator is for use in power circuits (<=60 Hz) where skin effect is not a concern. Very large wires such as those used in power transmission may require skin-effect consideration even at 60 Hz. It can be used for bus bars and other "non-wires" as long as the cross-sectional area and material/resistivity are known.

Wire Data

*When considering house wiring, extension cords, etc. it is especially important to consider the total length of all current-carrying wires of the circuit, which in most cases is two. A regular, single-phase 100-foot extension cord has 200 feet of current-carrying wire.

Electrical Data