Advanced Voltage Drop Calculator

Advanced Voltage Drop Calculator

DC · Single-phase AC · Three-phase AC — with temperature correction & cable size recommendation

Circuit Type
Supply
Cable Run
Distance from source to load — return path is included automatically.
Conductor
âš™ Advanced Options
Resistance rises ≈0.4% per °C. Use 50–75°C for loaded cables in hot spaces.
Identical conductors in parallel per leg.
ENTER VALUES
—
Voltage Drop
0%limit 5%10%+
Voltage Drop—
Voltage at Load—
Cable Resistance (loop)—
Power Lost in Cable—
Power Delivered to Load—
Calculations use IEC resistivity values at 20°C (plain Cu 0.017241, tinned Cu 0.0178, Al 0.028264 Ω·mm²/m) with temperature correction (αCu=0.00393, αAl=0.00403 /°C). AC results include typical cable reactance of 0.08 Ω/km and power factor. Results are a guide only — always verify against your local wiring regulations and cable manufacturer data.