4 AWG specifications
| Property | Value |
|---|---|
| Area | 21.15 mm² |
| Circular mils | 41,741 |
| Diameter (solid) | 5.19 mm / 0.2043 in |
| Resistance, copper, 20 °C | 0.815 Ω/km · 0.248 Ω/1000 ft |
| Ampacity, copper 75°C (NEC 310.16) | 85 A |
| Nearest metric size | 25 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 4 AWG in mm²?
21.15 mm².
What metric cable replaces 4 AWG?
25 mm², the next standard size up.