Resistance Calculator
Calculate electrical resistance using Ohm's law (R = V/I) or from resistivity, length, and cross-sectional area.
Enter values to calculate resistance.
Resistance Formulas
R = V / I (Ohm's Law)
R = ρ × L / A (from resistivity)
R = ρ × L / A (from resistivity)
Common Resistivities
| Material | ρ (Ω·m) |
|---|---|
| Copper | 1.68 × 10⁻⁸ |
| Aluminum | 2.65 × 10⁻⁸ |
| Gold | 2.44 × 10⁻⁸ |
| Iron | 9.71 × 10⁻⁸ |
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Last updated: 2026-08-08