Conversion table: American Wire Gauge [AWG] and metric wire standards

The American Wire Gauge is a measure for how thick a wire is. The number was originally related the amount of stretching that was needed to produce such a wire. The higher the number the thinner the wire.

The metric system outside of the Americas uses the cross sectional area in mm2 to describe how thick a wire is. That cross section is directly related to the resistance of the wire.

The table below provides a conversion between the two units. From the below table one could get the impression that there are more wire diameters in the American system. The opposite is however true. There are theoretically an infinite amount of diameters in the metric system as the measure is directly related to the size. From an engineering point of view it makes however sense to use standard sizes and they are shown below.

AWG
value
Diameter
[inch]
Diameter
[mm]
cross section
[mm2]
Copper resistance
[ohm/km]
common metric equivalent
[mm2]
5 0.1819 4.621 16.8 1.028  
6 0.1620 4.115 13.3 1.296  
7 0.1443 3.665 10.5 1.634  
8 0.1285 3.264 8.37 2.061  
9 0.1144 2.906 6.63 2.599  
10 0.1019 2.588 5.26 3.277  
11 0.0907 2.305 4.17 4.132 4.0
12 0.0808 2.053 3.31 5.211  
13 0.0720 1.828 2.62 6.571 2.5
14 0.0641 1.628 2.08 8.286  
15 0.0571 1.450 1.65 10.45 1.5
16 0.0508 1.291 1.31 13.17  
17 0.0453 1.150 1.04 16.61 1.0
18 0.0403 1.024 0.823 20.95 0.75
19 0.0359 0.912 0.653 26.42  
20 0.0320 0.812 0.518 33.31 0.5
21 0.0285 0.723 0.410 42.00  
22 0.0253 0.644 0.326 52.96  
23 0.0226 0.573 0.258 66.79  
24 0.0201 0.511 0.205 84.22 0.25
25 0.0179 0.455 0.162 106.2  
26 0.0159 0.405 0.129 133.9 0.14
27 0.0142 0.361 0.102 168.9  
28 0.0126 0.321 0.0810 212.9 0.09
29 0.0113 0.286 0.0642 268.5  
30 0.0100 0.255 0.0509 338.6  
31 0.00893 0.227 0.0404 426.9  
32 0.00795 0.202 0.0320 538.3  


Common values:

© Guido Socher, Version: 2010-03-02