Wire & Cable Calculator

Comprehensive wire and cable calculations for sizing, ampacity, voltage drop, and conduit fill.

Cable Sizing (Ampacity + Voltage Drop)

Determine appropriate cable size based on both current capacity and voltage drop requirements.

System Type

System Voltage (V)

Load Current (A)

Distance (ft)

Conductor Material

Insulation Type

Ambient Temperature (°C)

Number of Conductors

Max Voltage Drop (%)

Power Factor

Continuous load (≥3 hours) - applies 125% multiplier

NEC 210.19: Voltage drop should not exceed 3% for branch circuits (5% total)
NEC 310.15: Ampacity must be derated for temperature and bundling
Continuous loads: Conductors must be sized at 125% of load current
Always select larger size if two criteria require different sizes