Convert AWG to mm and resistance

The job

Datasheets are in AWG, the calipers are in mm, and the voltage-drop question needs resistance per metre. One table, three views — the tool converts any direction.

Convert

Choose what you have — an AWG number, a diameter in mm, or a cross-section in mm² — and read the gauge plus the other dimensions and the copper resistance at 20 °C.

• Every −3 AWG doubles the area; every −6 roughly doubles the diameter.
• Non-AWG inputs snap to the nearest standard gauge — 0.5 mm reads as AWG 24 (0.511 mm).

Worked example

AWG 24: 0.511 mm, 0.205 mm², ≈82.1 Ω/km of copper. A 10 m run of it loops about 1.6 Ω of resistance into the circuit.

Where it stops

AWG −3 (4/0) through 40, annealed copper at 20 °C. No ampacity column on purpose — current capacity depends on insulation, bundling, and code (NEC/IEC), which a gauge table cannot decide for you.