Wire Gauge Converter
AWG ↔ mm² with diameter and NEC ampacity reference
12 AWG · COPPER
3.31 mm²
Diameter 2.05 mm · 0.0808 in · 25 A @ 75°C ampacity
Ampacity (NEC 310.16)
Maximum continuous current for this conductor under standard NEC conditions, by insulation temperature rating.
Typical Loads This Wire Can Handle
Common applications based on the ampacity at your selected temperature rating.
AWG / mm² / Ampacity Reference Table
Click any row to jump to that gauge. Highlighted row = current selection.
| AWG | mm² | Dia (mm) | Dia (in) | 60°C | 75°C | 90°C |
|---|
Informational only.
Values follow NEC 310.16 reference data. They do not replace a licensed electrician — always consult local codes and a qualified professional before any electrical installation.