AWG Wire Size
Look up American Wire Gauge (AWG) specifications: diameter in mm, cross-section in mm², resistance per meter, and maximum ampacity for chassis and power wiring.
AWG
12
Diameter (mm)
2.053
Diameter (in)
0.0808
Area (mm²)
3.309
How to use the awg wire size
Pick the input direction. 'AWG → mm²' is the classic lookup; 'mm² → AWG' is for engineers spec'ing wire by metric cross-section.
Formula & explanation
diameter (mm) = 0.127 × 92^((36 − AWG)/39). Area (mm²) = π × (d/2)². Inverse: AWG = 36 − 39 × log₉₂(d/0.127).
Examples
AWG 12 ≈ 2.05 mm dia, 3.31 mm² cross-section. 4 mm² ≈ AWG 11.
Frequently asked questions
- Ampacity?
- Depends on insulation and bundling — consult NEC tables. AWG 12 is rated ~20 A typical residential.
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