American Wire Gauge and AWG Table for Bare Copper Wire

Located at http://members.fbody.com/komeil/awg.html, this page was originally part of my FBody.com member homepage before it turned commercial.

American Wire Gauge (AWG) provides a standard for measure of the thickness of copper, aluminum and other wirings in the United States and other countries.

Copper cabling typically varies from #0 to #21 AWG in car industry. The higher the number, the thinner the wire. The thicker the wire, the less susceptible it is to interference. In general, thin wire cannot carry the same amount of electric current the same distance that thicker wire can. Acquaintance with copper wire characteristics can guide you through establishing your car electrical equipments, electronics, and particularly setting up your car audio reference system.

AWG Table for Bare Copper Wire

AWG Dia. (mils) Dia. (mm) D.C. ohms/kft lbs/kft Amps Max. Amps
0000 (4/0) 460.00 11.684 0.0501 640.48 282.12 423.18
000 (3/0) 409.63 10.405 0.0631 507.93 223.73 335.60
00 (2/0) 364.79 9.2657 0.0795 402.80 177.43 266.14
0 (1/0) 324.85 8.2513 0.1003 319.44 140.71 211.06
1 289.29 7.3480 0.1264 253.33 111.59 167.38
2 257.62 6.5436 0.1593 200.90 88.492 132.74
3 229.42 5.8272 0.2009 159.32 70.177 105.27
4 204.30 5.1893 0.2533 126.35 55.653 83.480
5 181.94 4.6212 0.3195 100.20 44.135 66.203
6 162.02 4.1153 0.4028 79.460 35.001 52.501
7 144.28 3.6648 0.5080 63.014 27.757 41.635
8 128.49 3.2636 0.6405 49.973 22.012 33.018
9 114.42 2.9063 0.8077 39.630 17.456 26.185
10 101.90 2.5881 1.018 31.428 13.844 20.765
11 90.741 2.3048 1.284 24.924 10.978 16.468
12 80.807 2.0525 1.619 19.765 8.7064 13.060
13 71.961 1.8278 2.042 15.675 6.9045 10.357
14 64.083 1.6277 2.524 12.431 5.4755 8.2132
15 57.067 1.4495 3.181 9.8579 4.3423 6.5134
16 50.820 1.2908 4.018 7.8177 3.4436 5.1654
17 45.257 1.1495 5.054 6.1997 2.7309 4.0963
18 40.302 1.0237 6.386 4.9166 2.1657 3.2485
19 35.890 0.9116 8.046 3.8991 1.7175 2.5762
20 31.961 0.8118 10.13 3.0921 1.3620 2.0430
21 28.462 0.7229 12.77 2.4521 1.0801 1.6202
22 25.346 0.6438 16.20 1.9446 0.8566 1.2849
23 22.572 0.5733 20.30 1.5422 0.6793 1.0190
24 20.101 0.5106 25.67 1.2230 0.5387 0.8081
25 17.900 0.4547 32.37 0.9699 0.4272 0.6408
26 15.940 0.4049 41.02 0.7692 0.3388 0.5082
27 14.195 0.3606 51.44 0.6100 0.2687 0.4030
28 12.641 0.3211 65.31 0.4837 0.2131 0.3196
29 11.257 0.2859 81.21 0.3836 0.1690 0.2535
30 10.025 0.2546 103.7 0.3042 0.1340 0.2010
31 8.9276 0.2268 130.9 0.2413 0.1063 0.1594
32 7.9503 0.2019 162.0 0.1913 0.0843 0.1264
33 7.0799 0.1798 205.7 0.1517 0.0668 0.1003
34 6.3048 0.1601 261.3 0.1203 0.0530 0.0795
35 5.6146 0.1426 330.7 0.0954 0.0420 0.0630
36 5.0000 0.1270 414.8 0.0757 0.0333 0.0500
37 4.4526 0.1131 512.1 0.0600 0.0264 0.0397
38 3.9652 0.1007 648.2 0.0476 0.0210 0.0314
39 3.5311 0.0897 846.6 0.0377 0.0166 0.0249
40 3.1445 0.0799 1079 0.0299 0.0132 0.0198

AWG Table Units Reference

  • AWG: American Wire Gauge size varying from #0000 to #40
  • Dia. (mils): Wire diameter in mils (1 mil = 0.001 inches)
  • Dia. (mm): Wire diameter in millimeters. This was included to help when dealing with metric system.
  • D.C. ohms/kft: Wire electrical resistance against direct current in ohms per 1,000 feet
  • lbs/kft: Wire section weight in pounds per 1,000 feet
  • Amps: Wire conservative current rating in amperes
  • Max. Amps: Wire maximum allowable current rating in amperes. Do NOT exceed this rating.

AWG Wire Diameter Conventional Formula for Bare Copper Wire

By definition, 36 AWG is 0.0050 inches in diameter, and 0000 AWG is 0.4600 inches in diameter. The ratio of these diameters is 92, and there are 40 gauge sizes from 36 to 0000, or 39 steps. Using this common ratio, wire gauge sizes vary geometrically according to the following formula:

  • Wire diameter in millimeters: (92 ^ ((36 – AWG) / 39)) * 0.127
  • Wire diameter in mils: (92 ^ ((36 – AWG) / 39)) * 5
  • Wire diameter in inches: (92 ^ ((36 – AWG) / 39)) * 0.005

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