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