How to use the Conductor Resistance & Temperature Calculator
The Formula
R(T) = R₂₀ × [1 + α(T − 20°C)] where R₂₀ = ρL/A. Copper ρ ≈ 0.0175 Ω·mm²/m; aluminum ρ ≈ 0.0282 Ω·mm²/m at 20°C.
Practical Example
Hot conductors increase I²R loss and voltage drop. Size cables using field temperature—not datasheet 25°C values—before quoting wire quantities.
About Conductor Resistance & Temperature Calculator
Temperature-adjusted resistance
R(T) = R₂₀ × [1 + α(T − 20°C)] where R₂₀ = ρL/A. Copper ρ ≈ 0.0175 Ω·mm²/m; aluminum ρ ≈ 0.0282 Ω·mm²/m at 20°C.
Why it matters for DC cable BOM
Hot conductors increase I²R loss and voltage drop. Size cables using field temperature—not datasheet 25°C values—before quoting wire quantities.