Voltage Drop Calculator

Practical low-voltage voltage drop estimation for cable sizing and conductor selection.

System Type

Voltage (V)

Current (A)

Cable Length (m)

Material

Enter values and calculate

Cable Size Comparison

Size	VD (V)	VD %	Status

Voltage Drop Comparison Across Cable Sizes

Formula Used

Single Phase

VD = (2 × I × L × R) / 1000

Three Phase

VD = (1.732 × I × L × R) / 1000

Simplified resistance-based approximation for preliminary design.

Calculation Assumptions

• Conductor temperature assumed at 20°C
• Resistance-only approximation
• Balanced three-phase system assumed
• Reactance neglected
• Preliminary design estimation only