18 AWG specifications
| Property | Value |
|---|---|
| Area | 0.82 mm² |
| Circular mils | 1,624 |
| Diameter (solid) | 1.02 mm / 0.0403 in |
| Resistance, copper, 20 °C | 20.948 Ω/km · 6.385 Ω/1000 ft |
| Ampacity, copper 75°C (NEC 310.16) | Not for building wiring |
| Nearest metric size | 1.0 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 18 AWG in mm²?
0.82 mm².
What metric cable replaces 18 AWG?
1.0 mm², the next standard size up.