Design Calculators
Voltage Drop Calculation Report
Generated by Design Calculators © 2025
Advanced Voltage Drop Calculator
System & Load Parameters
Load Type
Specify the load in Amps (A), Kilowatts (kW), or Kilovolt-Amps (kVA). The tool will calculate the current if kW or kVA is selected.
Amps (A)
Kilowatts (kW)
kVA
Load Value
System Voltage (V)
Nominal line-to-line voltage for 3-phase, or line-to-neutral for 1-phase systems.
System Type
Three-Phase AC
Single-Phase AC
DC System
Power Factor (cos φ)
The ratio of real power (kW) to apparent power (kVA). Use 1.0 for purely resistive loads. Required for kW and Amp load types.
Conductor & Installation
Cable Length (m)
One-way length of the cable run from source to load.
Cable Size (mm²)
Cross-sectional area of the conductor.
1.5
2.5
4
6
10
16
25
35
50
70
95
120
150
185
240
300
400
500
630
Cable Material
Copper
Aluminum
Parallel Runs
Number of conductors per phase. Running cables in parallel reduces effective impedance.
Conductor Temp (°C)
The maximum expected operating temperature of the conductor, typically based on insulation type (e.g., 75°C for PVC, 90°C for XLPE).
Conduit Material
PVC (Non-Magnetic)
Steel (Magnetic)
Aluminum (Non-Magnetic)
No Conduit / Open Air
Calculation Method
IEC 60364 (Impedance)
NEC (K-Factor)
Simplified (Resistance Only)
Advanced Parameters (Optional)
Motor Locked Rotor Amps (LRA)
For motor starting calculations, enter the LRA from the motor nameplate. This will calculate the voltage dip during startup.
Ambient Temp (°C)
Ambient air or ground temperature. For professional use, this is used with derating tables to verify cable ampacity (informational for this tool).
Cables in Group
Number of circuits or multi-core cables in the same conduit/tray. Used with derating tables to verify ampacity (informational for this tool).
Project Management
Save Project As
Calculate Running VD
Calculate Motor Start VD
Save Project
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