Voltage Drop Calculator - CalculatorsHub

Voltage Drop Calculator (Advanced)

System Voltage (V) Load Current (A) Length (one-way)

Phase Conductor Material Wire size (AWG)

Results

Conductor resistance (Ω per 1000 ft, Cu): —

Resistance used (Ω per unit): —

Total conductor resistance (Ω): —

Voltage drop (V): —

Voltage drop (%): —

Voltage at load (V): —

Notes & Formula

Single-phase (2-wire): Vdrop = I × R_total (R_total includes round trip).
Three-phase (balanced): Vdrop = √3 × I × R_phase (one-way conductor resistance).
Resistance values shown are approximate standard values for copper (Ω per 1000 ft). Aluminum ~1.6× copper resistance.
Recommended maximum voltage drop is often 3% for branch circuits.