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AWG Wire / Ampacity

American Wire Gauge: each step down (thicker) is +26% area, six steps ≈ ×4 area. Diameter, area and copper resistance come from the AWG formula; ampacity is a rough single-conductor-in-free-air figure.

Filter (e.g. 12, 4/0)

AWG	Dia (mm)	Area (mm²)	Ω/km (Cu)	Ampacity (A)

Ampacity is a free-air / chassis-wiring estimate — for installed wiring use the derated NEC/IEC tables for your insulation, bundling and ambient. A reference aid, not a substitute for engineering judgment.