Calculate voltage drop in wires based on current, length, and material.
Calculate voltage drop and wire efficiency
A voltage drop calculator determines the loss of voltage in a circuit due to the resistance of the wires. Excessive voltage drop can cause equipment to fail or work inefficiently.
Enter the source voltage, current load, wire length, and select the wire size and material. The calculator will show the voltage drop and percentage loss.
Calculations are based on standard resistivity values for copper and aluminum at 20°C (68°F). Actual drop may vary with temperature and installation method.