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Wire Gauges Size

Below is a table of American Wire Gauge standard sizes and the characteristics of each wire size. For a particular gauge, it has a set diameter and cross-sectional area. When winding wire around for an inductor, coil, or transformer it is handy to know how thick the wire will stack up, which increases by wire gauge. An important measure is the electrical resistance of the wire which increases as the gauge goes higher and the diameter decreases. This is measured on ohms per kilometer or milliohms per meter. Finally the last column for Americans lists national electrical code current capacity for larger gauge wires - it is a good demonstration of current capacity changing as wire area changes.


AWG Diameter Turns of Wire, no insul. Area Copper resistance Maximum Amperage
(mm) (per cm) (mm2) (Ω/km) for wiring
(mΩ/m) (amps)
0 (1/0) 8.251 1.21 53.5 0.3224 245
1 7.348 1.36 42.4 0.4066 211
2 6.544 1.53 33.6 0.5127 181
3 5.827 1.72 26.7 0.6465 158
4 5.189 1.93 21.2 0.8152 135
5 4.621 2.16 16.8 1.028 118
6 4.115 2.43 13.3 1.296 101
7 3.665 2.73 10.5 1.634 89
8 3.264 3.06 8.37 2.061 73
9 2.906 3.44 6.63 2.599 64
10 2.588 3.86 5.26 3.277 55
11 2.305 4.34 4.17 4.132 47
12 2.053 4.87 3.31 5.211 41
13 1.828 5.47 2.62 6.571 35
14 1.628 6.14 2.08 8.286 32
15 1.45 6.9 1.65 10.45 28
16 1.291 7.75 1.31 13.17 22
17 1.15 8.7 1.04 16.61 19
18 1.024 9.77 0.823 20.95 16
19 0.912 11 0.653 26.42 14
20 0.812 12.3 0.518 33.31 11
21 0.723 13.8 0.41 42.0 9
22 0.644 15.5 0.326 52.96 7
23 0.573 17.4 0.258 66.79 4.7
24 0.511 19.6 0.205 84.22 3.5
25 0.455 22 0.162 106.2 2.7
26 0.405 24.7 0.129 133.9 2.2
27 0.361 27.7 0.102 168.9 1.7
28 0.321 31.1 0.081 212.9 1.4
29 0.286 35 0.0642 268.5 1.2
30 0.255 39.3 0.0509 338.6 0.86
31 0.227 44.1 0.0404 426.9 0.70
32 0.202 49.5 0.032 538.3 0.53
33 0.18 55.6 0.0254 678.8 0.43
34 0.16 62.4 0.0201 856 0.33
35 0.143 70.1 0.016 1079 0.27
36 0.127 78.7 0.0127 1361 0.21
37 0.113 88.4 0.0100 1716 0.17
38 0.101 99.3 0.00797 2164 0.13
39 0.0897 111 0.00632 2729 0.11
40 0.0799 125 0.00501 3441 0.09


ref: Adafruit