12 AWG specifications
| Property | Value |
|---|---|
| Area | 3.31 mm² |
| Circular mils | 6,530 |
| Diameter (solid) | 2.05 mm / 0.0808 in |
| Resistance, copper, 20 °C | 5.211 Ω/km · 1.588 Ω/1000 ft |
| Ampacity, copper 75°C (NEC 310.16) | 20 A |
| Nearest metric size | 4 mm² |
Diameter from the AWG formula d = 0.127 × 92^((36 − n) ÷ 39) mm. Stranded wire has a slightly larger outside diameter.
Frequently asked questions
What is 12 AWG in mm²?
3.31 mm².
What metric cable replaces 12 AWG?
4 mm², the next standard size up.