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Wire Gauge

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Standard Wire Gauge

Wire Number British Wire Gauge (SWG) American Wire Gauge (SWG)
Gauge No. Inches Equivalent in mm Inches Equivalent in mm Ohms per 1000 ft. of copper wire at 25C
7/0 0.5000 12.700
6/0 0.4640 11.786 0.5800 14.7320
5/0 0.4320 10.973 0.5165 13.1191
4/0 0.4000 10.160 0.4600 11.6840
3/0 0.3720 9.449 0.4096 10.4049
2/0 0.3480 8.839 0.3648 9.2658
1/0 0.3240 8.230 0.3249 8.2515
1 0.3000 7.620 0.2893 7.3481 0.1264
2 0.2760 7.010 0.2576 6.5437 0.1593
3 0.2520 6.401 0.2294 5.8273 0.2009
4 0.2320 5.893 0.2043 5.1892 0.2533
5 0.2120 5.385 0.1819 4.6203 0.3195
6 0.1920 4.877 0.1620 4.1148 0.4028
7 0.1760 4.470 0.1443 3.6652 0.5080
8 0.1600 4.064 0.1285 3.2639 0.6405
9 0.1440 3.658 0.1144 2.9058 0.8077
10 0.1280 3.251 0.1019 2.5883 1.0180
11 0.1160 2.946 0.0907 2.3038 1.2840
12 0.1040 2.642 0.0808 2.0523 1.6190
13 0.0920 2.337 0.0720 1.8288 2.0420
14 0.0800 2.032 0.0641 1.6281 2.5750
15 0.0720 1.829 0.0571 1.4503 3.2470
16 0.0640 1.626 0.0508 1.2903 4.0940
17 0.0560 1.422 0.0453 1.1506 5.1630
18 0.0480 1.219 0.0403 1.0236 6.5100
19 0.0400 1.016 0.0359 0.9119 8.2100
20 0.0360 0.914 0.0320 0.8128 10.350
21 0.0320 0.813 0.0285 0.7239 13.050
22 0.0280 0.711 0.0253 0.6426 16.460
23 0.0240 0.610 0.0226 0.5740 20.760
24 0.0220 0.599 0.0201 0.5105 26.170
25 0.0200 0.508 0.0179 0.4547 33.000
26 0.0180 0.457 0.0159 0.4039 41.620
27 0.0164 0.417 0.0142 0.3607 52.480
28 0.0148 0.376 0.0126 0.3200 66.170
29 0.0136 0.345 0.0113 0.2870 83.440
30 0.0124 0.315 0.0100 0.2540 105.20
31 0.0116 0.295 0.0089 0.2261 132.70
32 0.0108 0.274 0.0080 0.2032 167.30
33 0.0100 0.254 0.0071 0.1803 211.00
34 0.0092 0.234 0.0063 0.1600 266.00
35 0.0084 0.213 0.0056 0.1422 335.00
36 0.0076 0.193 0.0050 0.1270 423.00
37 0.0068 0.173 0.0045 0.1143 533.40
38 0.0060 0.152 0.0040 0.1016 672.60
39 0.0052 0.132 0.0035 0.0889 848.10
40 0.0048 0.122 0.0031 0.0787 1069.0
41 0.0044 0.112 0.0028 0.0711
42 0.0040 0.102 0.0025 0.0635
43 0.0036 0.091 0.0022 0.0559
44 0.0032 0.081 0.0020 0.0508
45 0.0028 0.071 0.0018 0.0457
46 0.0024 0.061 0.0016 0.0406
47 0.0020 0.051 0.0014 0.0356
48 0.0016 0.041 0.0012 0.0305
49 0.0012 0.031 0.0011 0.0279
50 0.0010 0.026 0.0010 0.0254
51 0.0009 0.0224
52 0.0008 0.0198
53 0.0007 0.0178
54 0.0006 0.0157
55 0.0006 0.0140
56 0.0004 0.0125

STANDARD WIRE GAGE SIZES

The table shows a list of standard wire sizes in the system known as the American Wire Gauge (AWG). The gage numbers specify the size of round wire in terms of its diameter and cross-sectional circular area.

NOTES:

1. As the gage number increases from 1 upward, the diameter and circular area decreases. Higher gage numbers indicate thinner wire sizes.
2. The circular area doubles for every three gage sizes. For example, gage number 10 wire has an approximately twice the area of gage no. 13 wire.
3. The higher the gage number and the thinner the wire, the greater the resistance of the wire for any given length.

CIRCULAR MILS.

The cross sectional area of a round wire is measured in circular mils.   A mil is a one-thousand of an inch, or 0.001 in. One circular mil is the cross-sectional area of a wire with a diameter of 1 mil.   The number of circular mils in any circular area is equal to the square of the diameter in mils.

TYPES OF WIRE CONDUCTORS

Most of wire conductors are copper, but sometimes silver and aluminum are also used, copper is tinned with a thin coating of solder, which gives a silvery appearance, the wire can be solid or stranded.  Stranded wire is more flexible and less likely to break open.  Sizes for stranded wire are equivalent to the sum of the areas for the individual strands. For instance, two strands of no. 30 wire are equivalent to no. 27 solid wire.