8 AWG to mm² – Wire Size & Diameter
8 AWG = 8.366 mm²
8 AWG solid wire has a cross-section of 8.366 mm² and a diameter of 3.264 mm (0.1285 in).
Step by step
- Diameter: d = 0.127 × 92^((36 − 8)/39) = 3.2636 mm.
- Area: π/4 × d² = 8.3656 mm².
8 AWG copper typically serves 40–50 A appliances like ranges.
Details
- Area
- 8.366 mm²
- Diameter
- 3.264 mm (0.1285 in)
- Area in kcmil
- 16.51
- Nearest metric size
- 10 mm²
- Copper resistance
- 2.061 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 8 AWG in mm²?
8.366 mm².
What is the diameter of 8 AWG wire?
3.264 mm (solid conductor).
What metric wire replaces 8 AWG?
Use the next metric size up with at least 8.37 mm².
Is stranded wire the same size?
Stranded wire of the same gauge has the same copper area but a slightly larger overall diameter.