Common Wire Gauges

The common U.S. wire gauges (called AWG gauges) refer to sizes of copper wire. The resistivity of copper at 20 C is about

AWG wire
size (solid)
Diameter
(inches)
Resistance per
1000 ft (ohms)
Resistance per
1000 m (ohms)
24
0.0201
25.67
84.2
22
0.0254
16.14
52.7
20
0.0320
10.15
33.2
18
0.0403
6.385
20.9
16
0.0508
4.016
13.2
14
0.0640
2.525
8.28
12
0.0808
1.588
5.21
10
0.1019
0.999
3.28
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American Wire Gages (AWG) Sizes and Resistances

AWG wire
size (solid)
Area
CM*
Resistance per
1000 ft (ohms) @ 20 C
Diameter
(inches)
0000
211600
0.049
0.46
000
167810
0.0618
0.40965
00
133080
0.078
0.3648
0
105530
0.0983
0.32485
1
83694
0.124
0.2893
2
66373
0.1563
0.25763
3
52634
0.197
0.22942
4
41742
0.2485
0.20431
5
33102
0.3133
0.18194
6
26250
0.3951
0.16202
7
20816
0.4982
0.14428
8
16509
0.6282
0.12849
9
13094
0.7921
0.11443
10
10381
0.9989
0.10189
11
8234
1.26
0.09074
12
6529
1.588
0.0808
13
5178.4
2.003
0.07196
14
4106.8
2.525
0.06408
15
3256.7
3.184
0.05707
16
2582.9
4.016
0.05082
17
2048.2
5.064
0.04526
18
1624.3
6.385
0.0403
19
1288.1
8.051
0.03589
20
1021.5
10.15
0.03196
21
810.1
12.8
0.02846
22
642.4
16.14
0.02535
23
509.45
20.36
0.02257
24
404.01
25.67
0.0201
25
320.4
32.37
0.0179
26
254.1
40.81
0.01594
27
201.5
51.47
0.0142
28
159.79
64.9
0.01264
29
126.72
81.83
0.01126
30
100.5
103.2
0.01002
31
79.7
130.1
0.00893
32
63.21
164.1
0.00795
33
50.13
206.9
0.00708
34
39.75
260.9
0.0063
35
31.52
329
0.00561
36
25
414.8
0.005
37
19.83
523.1
0.00445
38
15.72
659.6
0.00396
39
12.47
831.8
0.00353
40
9.89
1049
0.00314

The U.S. wire gauges (called AWG gauges) refer to sizes of copper wire. This table corresponds to a resistivity of

for copper at 20 C

*The AWG system states areas of round copper wires in "circular mils", which is the square of the diameter in mils. 1 mil =.001 inch.

This data from Floyd, Electric Circuit Fundamentals, 2nd Ed.

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Reference
Floyd
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