Voltage Drop Calculator for Cable & Power Circuits
Estimate cable voltage drop and line loss for electrical circuits.
Use this voltage drop calculator to estimate cable voltage drop, percentage voltage loss, and receiving-end voltage based on cable length, conductor size, load current, and material.
Circuit Parameters
System Specs
V
Amps
Conductor Specs
mm²
Calculated Voltage Drop
Line Loss
Percentage Drop
0.00
%
Status Check
Absolute Voltage Loss
0.00
V
Total voltage lost in cable
Receiving End
Load Terminal
Voltage at Load
0.00
V
Actual voltage reaching equipment
Engineering Reference
3-Phase Voltage Drop
VD = (√3 × I × L × ρ) / A
1-Phase Voltage Drop
VD = (2 × I × L × ρ) / A
- L = Length in meters
- I = Load Current (A)
- A = Cable Area (mm²)
- ρ = Resistivity (Cu: 0.0175, Al: 0.028)
- Lim = NEC typically recommends <3% for branch circuits, max 5% total.