WIRE SIZE CALCULATOR
Estimate a Conductor Size
Enter the load current, system voltage, cable run and allowable voltage drop to estimate a voltage-drop-based conductor cross-section and the nearest standard cable size. Final cable selection must be confirmed by a qualified electrical professional.
1Input Parameters
Estimate a voltage-drop-based conductor size
How the phase setting affects the estimate
DC and single-phase calculations include outgoing and return conductors. Three-phase uses √3 × line current × one-way length.
2Calculated Recommendation
Voltage-drop-based planning result
Enter values to calculate wire size
Complete the input parameters and calculate a voltage-drop-based planning recommendation.
Planning Disclaimer
This calculator estimates conductor size primarily from voltage-drop considerations. Final cable sizing must also consider ampacity, installation method, insulation rating, ambient temperature, grouping/derating, short-circuit withstand, protective devices, local electrical regulations, and manufacturer requirements. Consult a qualified electrical professional before installation.