Free Wire Resistance Calculator
Calculate the resistance of a wire from its material, length, and cross-sectional area: R = rho * L / A.
Ω·m
m
mm²
Wire Resistance
0.6720 Ω
Wire Resistance vs Resistivity (ρ)
Wire Resistance
The resistance of a wire depends on the material, its length, and cross-sectional area.
Formula
R = ρ * L / A
where ρ is the resistivity of the material (Ω·m), L is the wire length, and A is the cross-sectional area. Copper has ρ = 1.68 x 10^-8 Ω·m.
Example Calculation
100 m of copper wire with 2.5 mm² cross-section.
- 01R = ρ * L / A
- 02R = 1.68e-8 * 100 / 2.5e-6
- 03R = 1.68e-6 / 2.5e-6
- 04R = 0.672 Ω
Frequently Asked Questions
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