AWG to mm² Converter
Result will appear here
Free AWG to mm² Converter
Electrical standards vary wildly across the globe. While North America uses the American Wire Gauge (AWG) system, the rest of the world uses metric cross-sectional area (mm²). Our free AWG to mm² Converter serves as a two-way dictionary, instantly calculating exact cross-sectional areas, diameters, and electrical resistance.
How to Use the Converter
- Choose your conversion mode: Select the radio button at the top to convert from AWG to mm², or from mm² to the closest AWG equivalent.
- Input your wire size: Use the dropdown menu to select a standard American Wire Gauge (from 4/0 down to 40 AWG), or type in your metric cross-sectional area.
- View Instant Data: The tool automatically processes the complex logarithmic math in real-time. You will immediately see the exact cross-sectional area, the physical diameter of the wire (in both millimeters and inches), and the theoretical resistance of the copper conductor per kilometer and per 1,000 feet.
- Copy Your Data: Click the "Copy Results" button to save the technical specifications to your clipboard.
The Conversion Formulas
The AWG system is entirely logarithmic. The physical diameter of a wire is determined by the specific mathematical formula defined by the ASTM B258 standard:
- Diameter (mm) = 0.127 × 92(36 - AWG) / 39
- Area (mm²) = (π / 4) × Diameter2
*Note: For AWG sizes containing zeros (like 2/0 or 4/0), the AWG number is treated as negative. For example, 2/0 is treated as -1 in the mathematical formula.
Stranded vs. Solid Wire Disclaimer: The cross-sectional area (mm²) and diameter calculations provided by this tool reflect the measurements of a solid conductive wire. If you are using stranded wire, the total conductive cross-sectional area remains the same, but the physical overall outer diameter of the wire will be roughly 5% larger due to the microscopic air gaps between the individual twisted copper strands.