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Conductor Resistance Calculator

Calculate a conductor's resistance from its resistivity, length, and cross-sectional area (R = (ρ × L) ÷ A).

The conductor material's resistivity, e.g. copper ≈ 0.0172 Ω·mm²/m.

Formula

R = (ρ × L) ÷ A

R
Resistance, in ohms
ρ
Resistivity of the conductor material
L
Conductor length, in meters
A
Cross-sectional area, in square millimeters

What this calculator does

Calculates a conductor's resistance from its material resistivity, length, and cross-sectional area.

Use cases

  • Find the expected resistance of a conductor run before installation
  • Compare resistance between conductors of different materials or sizes
  • Verify a measured resistance against the expected calculation

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