Wire Resistance Calculator
Find the resistance of a wire from its physical properties.
CALCULATE
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Formulas
R = ρ × L / AR = Resistance, ρ = Resistivity, L = Length, A = Cross-sectional area
Wire Resistance
Every wire has resistance depending on material, length, and cross-section. Copper: 1.68×10⁻&sup8; Ω·m. Aluminum: 2.65×10⁻&sup8;. Steel: ~1.0×10⁻&sup7;.
Temperature effects
Copper resistance increases ~0.4% per °C. For critical applications, account for operating temperature.
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