Electricians

Voltage Drop Calculator

Calculate voltage drop for copper conductors. Single-phase, AWG 14–4/0. Free, no signup.

System Voltage

Load Current (Amps)

One-Way Distance (feet)

Wire Gauge (Copper)

Precision disclaimer: Uses K=12.9 for copper at 75\u00B0C. Results are approximations for reference only. Actual installations must comply with NEC requirements. Consult a licensed electrician.

Want more advanced calculations?

Check out our professional apps →