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Welding cable size

Product Guide & Selection

Welding cable gauge reference table has the circular mil as well as the diameter measurements of the wire.
welding cable size image

Welding cable size

Welder cable size refers to the cable's cross-sectional area, which is measured by numbers known as "gauges." Cross-sectional areas of wires are measured in either circular mils (cmil) or square mm. A mil is a length of 1/1000 of an inch, and a circular mil is the area of a circle that is 1 mil in diameter.

welding cable size

American Wire Gauge (AWG) ratings for welding cable sizes

AWG ratings for welding cable size will have three numbers that give the rating for the cable overall, the number of strands, and the rating for the strands themselves. Thus, a welding cable size of 2 AWG 625/30 has a total cross-sectional area of 2 AWG made from 625 strands rated at 30 AWG. Similarly, a welding cable size of 18 AWG 7/26 has a total cross-sectional area rating of 18 AWG with 7 strands rated at 26 AWG.

American Wire Gauge (AWG) reference table

AWG Diameter (Inch) Diameter (MM) Circular Mil
4/0 AWG 0.4600 11.6840 211593.92
3/0 AWG 0.4096 10.4038 167767.34
2/0 AWG 0.3648 9.2659 133075.22
1/0 AWG 0.3249 8.2525 105556.98
1 AWG 0.2893 7.3482 83692.09
2 AWG 0.2580 6.5532 66562.09
3 AWG 0.2290 5.8166 52439.49
4 AWG 0.2040 5.1816 41614.80
5 AWG 0.1820 4.6228 33123.05
6 AWG 0.1620 4.1154 26250.70
7 AWG 0.1443 3.6648 20817.56
8 AWG 0.1285 3.2639 16511.78
9 AWG 0.1144 2.9058 13086.98
10 AWG 0.1019 2.5883 10383.31
11 AWG 0.0907 2.3038 8226.25
12 AWG 0.0808 2.0523 6528.45
13 AWG 0.0720 1.8288 5183.85
14 AWG 0.0641 1.6281 4108.69
15 AWG 0.0571 1.4503 3260.32
16 AWG 0.0508 1.2903 2580.57
17 AWG 0.0453 1.1506 2052.03
18 AWG 0.0403 1.0236 1624.04
19 AWG 0.0359 0.9119 1288.77
20 AWG 0.0320 0.8128 1023.97
21 AWG 0.0285 0.7239 812.23
22 AWG 0.0253 0.6426 640.07
23 AWG 0.0226 0.5740 510.75
24 AWG 0.0201 0.5105 404.00
25 AWG 0.0179 0.4547 320.40
26 AWG 0.0159 0.4039 252.80
27 AWG 0.0142 0.3607 201.63
28 AWG 0.0126 0.3200 158.76
29 AWG 0.0113 0.2870 127.69
30 AWG 0.0100 0.2540 100.00
31 AWG 0.0089 0.2261 79.21
32 AWG 0.0080 0.2032 64.00
33 AWG 0.0071 0.1803 50.41
34 AWG 0.0063 0.1600 39.69
35 AWG 0.0056 0.1422 31.36
36 AWG 0.0050 0.1270 25.00
37 AWG 0.0045 0.1143 20.25
38 AWG 0.0040 0.1016 16.00
39 AWG 0.0035 0.0889 12.25
40 AWG 0.0031 0.0787 9.61


welding cable size ampacity

PLEASE NOTE: AWG ratings for stranded wire, like welding cable sizes, refers to the total cross-sectional area and not the diameter. In stranded wire, cross-sectional area and cable length determine how much space there is for electricity to travel through, which directly affects the cable's electrical resistance (see welding cable ampacity for more information).

For solid wire, the cross-sectional area depends on the overall diameter. But for welding cable, the cross-sectional area depends on the size and number of strands. Thus, a welding cable size with the same diameter can have different cross-sectional areas due to different strandings. Also, stranded cables with the same cross-sectional area as a piece of solid wire will always have a slightly larger diameter.

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