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Wire Resistance & Voltage Drop Calculator

Use 0 for AWG 0, -1 for 2/0, -2 for 3/0, -3 for 4/0

A
°C

Common AWG Sizes

Results

Resistance
842.083 mΩ
Voltage Drop
8.4208 V
@ 10 A
Power Loss
84.2083 W
R per Meter
84.208 mΩ
Material
Copper @ 20°C
ρ = 1.724 µΩ·cm

Note: Actual resistance may vary based on wire quality, connections, and stranding.

Show formulas

Wire Resistance

R=ρ⋅LAR = \rho \cdot \frac{L}{A}

Where R is resistance (Ω), ρ is resistivity (Ω·m), L is length (m), A is cross-sectional area (m²)

Temperature Correction

ρ(T)=ρ20⋅[1+α⋅(T−20)]\rho(T) = \rho_{20} \cdot [1 + \alpha \cdot (T - 20)]

Where α is the temperature coefficient (~0.00393/°C for copper)

Voltage Drop & Power Loss

Vdrop=I⋅RV_{drop} = I \cdot R
Ploss=I2⋅RP_{loss} = I^2 \cdot R

Material Resistivity (at 20°C)

Copper: 1.724 × 10⁻⁸ Ω·m
Aluminum: 2.65 × 10⁻⁸ Ω·m
Silver: 1.59 × 10⁻⁸ Ω·m
Gold: 2.44 × 10⁻⁸ Ω·m