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Wire gauge chart

There are many different wire gauge designations. AWG = American Wire Gauge, SWG = Imperial Standard Wire Gauge - (British legal standard), B&S = Brown & Sharpe, International standard wire sizes (IEC 60228) etc.

In the American Wire Gauge(AWG), diameters can be calculated by applying the formula

D(AWG)=0.005·92((36-AWG)/39) (inch).

For the 00, 000, 0000 etc. gauges is using: -1, -2, -3. This means that in American wire gage every 6 gauge decrease gives a doubling of the wire diameter area, and every 3 gauge decrease doubles the wire cross sectional area. Just like "dB" in signal levels!
In the Metric Gauge scale, the gauge is 10 times the diameter in millimeters, so a 50 gauge metric wire would be 5 mm in diameter.

For more information about Wire characteristics see here (with selecting the necessary wire size)

Note that in AWG the diameter goes up as the gauge goes down metric is the opposite. Probably because of this confusion, most of the time metric sized wire is specified in millimeters rather than metric gauges.

American Wire Gauge(AWG)chart
AWG Diameter Inches Diameter mm Ohms per 1000 ft Ohms per km Maximum amps for chassis wiring Maximum amps for power transmission
OOOO 0.46 11.684 0.049 0.16072 380 302
OOO 0.4096 10.40384 0.0618 0.202704 328 239
OO 0.3648 9.26592 0.0779 0.255512 283 190
0 0.3249 8.25246 0.0983 0.322424 245 150
1 0.2893 7.34822 0.1239 0.406392 211 119
2 0.2576 6.54304 0.1563 0.512664 181 94
3 0.2294 5.82676 0.197 0.64616 158 75
4 0.2043 5.18922 0.2485 0.81508 135 60
5 0.1819 4.62026 0.3133 1.027624 118 47
6 0.162 4.1148 0.3951 1.295928 101 37
7 0.1443 3.66522 0.4982 1.634096 89 30
8 0.1285 3.2639 0.6282 2.060496 73 24
9 0.1144 2.90576 0.7921 2.598088 64 19
10 0.1019 2.58826 0.9989 3.276392 55 15
11 0.0907 2.30378 1.26 4.1328 47 12
12 0.0808 2.05232 1.588 5.20864 41 9.3
13 0.072 1.8288 2.003 6.56984 35 7.4
14 0.0641 1.62814 2.525 8.282 32 5.9
15 0.0571 1.45034 3.184 10.44352 28 4.7
16 0.0508 1.29032 4.016 13.17248 22 3.7
17 0.0453 1.15062 5.064 16.60992 19 2.9
18 0.0403 1.02362 7.085 20.9428 16 2.3
19 0.0359 0.91186 8.051 26.40728 14 1.8
20 0.032 0.8128 10.15 33.292 11 1.5
21 0.0285 0.7239 12.8 41.984 9 1.2
22 0.0254 0.64516 16.14 52.9392 7 0.92
23 0.0226 0.57404 20.36 66.7808 4.7 0.729
24 0.0201 0.51054 25.67 84.1976 3.5 0.577
25 0.0179 0.45466 32.37 106.1736 2.7 0.457
26 0.0159 0.40386 40.81 133.8568 2.2 0.361
27 0.0142 0.36068 51.47 168.8216 1.7 0.288
28 0.0126 0.32004 64.9 212.872 1.4 0.226
29 0.0113 0.28702 81.83 268.4024 1.2 0.182
30 0.01 0.254 103.2 338.496 0.86 0.142
31 0.0089 0.22606 130.1 426.728 0.7 0.113
32 0.008 0.2032 164.1 538.248 0.53 0.091
Metric 2.0 0.00787 0.200 169.39 555.61 0.51 0.088
33 0.0071 0.18034 206.9 678.632 0.43 0.072
Metric 1.8 0.00709 0.180 207.5 680.55 0.43 0.072
34 0.0063 0.16002 260.9 855.752 0.33 0.056
Metric 1.6 0.0063 0.16002 260.9 855.752 0.33 0.056
35 0.0056 0.14224 329 1079.12 0.27 0.044
Metric 1.4 .00551 .140 339 1114 0.26 0.043
36 0.005 0.127 414.8 1360 0.21 0.035
Metric 1.25 .00492 0.125 428.2 1404 0.20 0.034
37 0.0045 0.1143 523.1 1715 0.17 0.0289
Metric 1.12 .00441 0.112 533.8 1750 0.163 0.0277
38 0.004 0.1016 659.6 2163 0.13 0.0228
Metric 1 .00394 0.1000 670.2 2198 0.126 0.0225
39 0.0035 0.0889 831.8 2728 0.11 0.0175
40 0.0031 0.07874 1049 3440 0.09 0.0137

British SWG (Standard Wire Gauge) chart
SWG Diameter Inches Diameter mm SWG Diameter Inches Diameter mm
7/0 0.500 12.700 26 0.018 0.4572
6/0 0.464 11.786 27 0.0164 0.4166
5/0 0.432 10.973 28 0.0148 0.3759
4/0 0.400 10.160 29 0.0136 0.3454
3/0 0.372 9.449 30 0.0124 0.3150
2/0 0.348 8.839 31 0.0116 0.2946
0 0.324 8.230 32 0.0108 0.2743
1 0.300 7.620 33 0.0100 0.2540
2 0.276 7.010 34 0.0092 0.2337
3 0.252 6.401 35 0.0084 0.2134
4 0.232 5.893 36 0.0076 0.1930
5 0.212 5.385 37 0.0068 0.1727
6 0.192 4.877 38 0.0060 0.1524
7 0.176 4.470 39 0.0052 0.1321
8 0.160 4.064 40 0.0048 0.1219
9 0.144 3.658 41 0.0044 0.1118
10 0.128 3.251 42 0.004 0.1016
11 0.116 2.946 43 0.0036 0.0914
12 0.104 2.642 44 0.0032 0.0813
13 0.092 2.337 45 0.0028 0.0711
14 0.080 2.032 46 0.0024 0.0610
15 0.072 1.829 47 0.0020 0.0508
16 0.064 1.626 48 0.0016 0.0406
17 0.056 1.422 49 0.0012 0.0305
18 0.048 1.219 50 0.0010 0.0254
19 0.040 1.016
20 0.036 0.914
21 0.032 0.813
22 0.028 0.711
23 0.024 0.610
24 0.022 0.559
25 0.020 0.5080

Metric Wire Gauge (IEC 60228)
Wire diameter, mm Cross-section mm2 Resistance of wire with 1Km lenghth at t=20°C, Ohm Permissible current load according to standard 2.5A/mm2, A
0,05 0,00196 9290 0,0049
0,06 0,00283 6440 0,0071
0,07 0,00385 4730 0,0097
0,08 0,00502 2630 0,0126
0,09 0,00636 2860 0,0159
0,10 0,00785 2240 0,0196
0,11 0,00950 1850 0,0238
0,12 0,01131 1550 0,0283
0,13 0,01327 1320 0,0333
0,14 0,01539 1140 0,0385
0,15 0,01767 984 0,0442
0,16 0,02011 873 0,0503
0,17 0,02270 773 0,0568
0,18 0,02545 688 0,0638
0,19 0,02835 618 0,0710
0,20 0,03142 558 0,0785
0,21 0,03464 507 0,0866
0,23 0,04165 423 0,1041
0,25 0,04909 357 0,1241
0,27 0,05726 605 0,1435
0,29 0,06605 266 0,1650
0,31 0,07548 233 0,1890
0,33 0,08553 205 0,2140
0,35 0,09621 182 0,2405
0,38 0,11341 155 0,283
0,41 0,13202 133 0,330
0,44 0,15205 115 0,380
0,47 0,17349 101 0,433
0,49 0,18848 93,1 0,478
0,51 0,20428 85,9 0,510
0,53 0,22051 79,3 0,533
0,55 0,23758 73,9 0,595
0,57 0,25565 68,4 0,643
0,59 0,28740 64,3 0,683
0,62 0,30191 57,8 0,755
0,64 0,32170 54,6 0,805
0,67 0,35256 49,7 0,893
0,69 0,37395 46,9 0,935
0,72 0,40715 43,0 1,018
0,74 0,43008 40,8 1,075
0,77 0,46656 37,6 1,166
0,80 0,50265 34,9 1,260
0,83 0,54060 32,4 1,350
0,86 0,58088 32 1,450
0,90 0,63617 27,5 1,590
0,93 0,67929 25,8 1,690
0,96 0,73282 24,2 1,810
1,00 0,78540 22,4 1,960
 
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