3/0 AWG to mm² – Wire Size & Diameter
3/0 AWG = 85.029 mm²
3/0 AWG solid wire has a cross-section of 85.029 mm² and a diameter of 10.405 mm (0.4096 in).
Step by step
- Diameter: d = 0.127 × 92^((36 − -2)/39) = 10.4049 mm.
- Area: π/4 × d² = 85.0288 mm².
3/0 AWG is a heavy gauge for feeders, service entrances, batteries and welding cables.
Details
- Area
- 85.029 mm²
- Diameter
- 10.405 mm (0.4096 in)
- Area in kcmil
- 167.81
- Nearest metric size
- 95 mm²
- Copper resistance
- 0.203 Ω/km
How it works
The American Wire Gauge system is logarithmic: smaller numbers mean thicker wire, every 6 gauges halve the diameter and every 3 gauges roughly halve the area. Metric wire is specified directly by cross-sectional area in mm², so the sizes never line up exactly. When substituting, choose a conductor with at least the same area, and always follow local electrical codes.
Nearby values
Related conversions
Frequently asked questions
What is 3/0 AWG in mm²?
85.029 mm².
What is the diameter of 3/0 AWG wire?
10.405 mm (solid conductor).
What metric wire replaces 3/0 AWG?
Use the next metric size up with at least 85.03 mm².
Is stranded wire the same size?
Stranded wire of the same gauge has the same copper area but a slightly larger overall diameter.