Voltage Drop Calculator

Voltage Drop Formula

Vd = (2 × I × R × L) / 1000

• Vd = Voltage drop (volts)
• I = Current (amperes)
• R = Resistance per km (Ω/km)
• L = Cable length (meters)
• Factor 2 accounts for both conductors

Recommended maximum: 3% for power circuits, 5% for lighting