Voltage Drop Calculator – NEC & IEC
e.g., 120V, 240V, 480V
e.g., 20 A
Feet or Meters
Typical 0.85–0.95
75°C common
Enter specs → see voltage drop & recommended wire…
NEC 210.19(A)(1) ≤3% branch, ≤5% feeder. Auto-recommends upsized wire. Live chart.
Voltage Drop Calculator
Use a Voltage Drop Calculator to find cable voltage loss and percentage drop for copper or aluminum wires.