Cross Reference AWG to MM2 ; 28, 0.08 ; 26, 0.14 ; 24, 0.25 ; 22, 0.34....
In the world of electrical engineering and wiring, two common units of measurement for wire gauge are American Wire Gauge (AWG) and square millimeters (mm²). While AWG is widely used in the United States, many other countries use mm². Understanding how to convert from one unit to another is crucial for accurate and safe wiring. This guide will help you understand the relationship between AWG and mm², and provide you with a simple conversion table.
American Wire Gauge (AWG) is a North American wire gauge system used to measure the diameter of round, solid, electrical wire. It was established in 1857 and is based on a logarithmic scale. On the other hand, square millimeters (mm²) is a metric unit used to measure the cross-sectional area of a wire. It's more intuitive as it directly relates to the wire's size and its current-carrying capacity.
Converting AWG to mm² is important for several reasons. Firstly, it helps in standardizing wire sizes across different regions and industries. Secondly, it's crucial for ensuring safety and compliance with regulations. For instance, the International Electrotechnical Commission (IEC) recommends using mm² for wire sizing. Lastly, it aids in accurate calculations of current-carrying capacity and voltage drop.
The conversion from AWG to mm² involves a bit of math. The formula to calculate the area in mm² for a given AWG is:
Area (mm²) = (36 - 3.14 * AWG) / (3.14 * 785) * 1000
However, for most practical purposes, using a conversion table is more convenient and accurate.

| American Wire Gauge (AWG) | Square Millimeters (mm²) |
|---|---|
| 14 | 2.08 |
| 16 | 1.33 |
| 18 | 0.84 |
| 20 | 0.53 |
| 22 | 0.33 |
| 24 | 0.20 |
| 26 | 0.13 |
| 28 | 0.08 |
To use the conversion table, simply find the AWG of your wire in the left column and read the corresponding mm² value in the right column. For example, if your wire is AWG 18, its cross-sectional area is approximately 0.84 mm².
In the ever-evolving world of electrical engineering, understanding how to convert between AWG and mm² is not just beneficial, but often necessary. With this guide, you now have the knowledge and tools to make accurate conversions, ensuring safe and efficient electrical systems.
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