Technical Calculators

Free engineering tools to help you select the right wire specifications

SWG to mm Converter

Convert Standard Wire Gauge (SWG) numbers to millimeter diameters.

AWG to mm Converter

Convert American Wire Gauge (AWG) numbers to millimeter diameters.

Wire Resistance Calculator

Calculate the electrical resistance of a wire based on alloy grade, diameter, and length.

Formula

R = (ρ × L) / A

Where: R = Resistance (Ω), ρ = Resistivity (Ω·mm²/m), L = Length (m), A = Cross-sectional area = π × (d/2)² (mm²)

Ohm’s Law Calculator

Enter any two values and click Calculate to find the remaining values.

Formulas Used

P = V × I  |  V = I × R  |  P = I² × R

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