Wire Resistance & Voltage Drop Calculator
Resistance and voltage drop of a wire from its material, length and cross-section.
How to use the Wire Resistance & Voltage Drop Calculator
- Enter or select: Material (resistivity Ω·m at 20 °C), Length (one way), Cross-section area, Current, Return conductor.
- The results (Resistance, Voltage drop, Power loss, Wire diameter) are calculated instantly as you type.
- Use “Copy link” to share the calculation with the same input values.
Formula
- R = ρ·L/A