AWG to Metric Conversion Chart. AWG Number Ø [Inch] Ø [mm] Ø [mm²] Resistance [Ohm/m]. 4/0 = 0000. 0.460. 11.7. 107. 0.000161. 3/0 = 000. 0.410. 10.4. 85.0....
When working with electrical wiring, it's crucial to understand the wire gauge size to ensure safety and efficiency. The American Wire Gauge (AWG) system is commonly used, but it's essential to convert these sizes to millimeters (mm) for international standards or specific project requirements. This article will guide you through understanding the AWG wire size chart in mm.
The American Wire Gauge (AWG) system is a standard used to measure the diameter of electrical wires. It was established in 1857 and has since been widely adopted in the United States and other countries. The AWG system is based on a logarithmic scale, meaning that each gauge size is approximately 1.12 times larger than the previous one.
Converting AWG to millimeters (mm) is necessary when working with international standards or specific project requirements that use the metric system. It's also helpful for comparing wire sizes with other measurement systems, such as the British Standard Wire Gauge (SWG) or the metric designator (MD).

To convert AWG to mm, you can use the following formula:
d(mm) = 0.127 * (36 - 2 * AWG)
where d(mm) is the diameter of the wire in millimeters, and AWG is the American Wire Gauge size.

Here's a table that shows the most common AWG sizes and their equivalent diameters in millimeters:
| American Wire Gauge (AWG) | Diameter (mm) |
|---|---|
| 12 | 2.05 |
| 14 | 1.63 |
| 16 | 1.30 |
| 18 | 1.02 |
| 20 | 0.81 |
| 22 | 0.64 |
| 24 | 0.51 |
When selecting a wire gauge, consider the amperage (current) the wire will carry, the voltage of the circuit, and the length of the wire run. Using a larger gauge wire than necessary can lead to overcurrent protection device (like fuses or circuit breakers) tripping frequently, while using a smaller gauge wire can result in overheating, insulation damage, and potential fire hazards.
Always follow local electrical codes and regulations when working with electrical wiring. If you're unsure about any aspect of your project, consult a licensed electrician or electrical engineer. Safety should always be your top priority when working with electricity.
Understanding the AWG wire size chart in mm is essential for any electrical project. By familiarizing yourself with this chart and the conversion formula, you'll be better equipped to handle international projects or work with different measurement systems. Happy wiring!
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