AWG to mm² Calculator

AWG and mm² describe the same wire

American Wire Gauge is a step scale — a smaller number means a thicker wire — while the metric world sizes cable by its actual cross-section in square millimetres. Datasheets, panels and controllers mix the two, so converting is a routine step when you size solar cable or check a voltage drop.

Handy reference points

14 AWG ≈ 2.1 mm², 12 AWG ≈ 3.3 mm², 10 AWG ≈ 5.3 mm², 8 AWG ≈ 8.4 mm², 6 AWG ≈ 13.3 mm², 4 AWG ≈ 21.2 mm², and 1/0 AWG ≈ 53.5 mm². Note that a nominal metric size (say 6 mm²) rarely equals an AWG exactly — pick the next size up when in doubt.

Frequently asked questions

6 AWG is about 13.3 mm² in cross-section, with a diameter close to 4.1 mm.

Thinner. AWG runs backwards: the larger the number, the smaller the wire. 10 AWG is thicker than 14 AWG.

They are two independent standards. A common metric size such as 6 mm² sits between 10 and 8 AWG, so exact equivalence is rare; choose the next larger size for safety.

Treat it as a starting guide for 75°C copper in free air. Real ampacity depends on insulation temperature rating, ambient heat and how many conductors are bundled, so confirm against NEC Table 310.16.