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Copper Wire - Electrical Resistance

Gauge, weight, circular mils and electrical resistance

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Electrical resistance in copper wire:

For full table with Electrical Resistance and Weight - rotate the screen!

AWG Gauge*Area
(Circular Mils)
Diameter
(mils, 1000th in)
Electrical Resistance
(Ohms/1000 ft)

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Weight
(lb/1000 ft)

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 at 77oF (25oC)
at 149oF (65oC)
0000 (4/0) 212000 460 0.0500 0.057 641
000 (3/0) 168000 410 0.0630 0.073 508
00 (2/0) 133000 365 0.0795 0.092 403
0 (1/0) 106000 325 0.100 0.116 319
1 83700 289 0.126 0.146 253
2 66400 258 0.159 0.184 201
3 52600 229 0.201 0.232 159
4 41700 204 0.253 0.292 126
5 33100 0.319 100
6 26300 162 0.403 0.465 79.5
7 20800 0.508 63.0
8 16500 128 0.641 0.739 50.0
9 13100 0.808 39.6
10 10400 102 1.02 1.18 31.4
11 8230 1.28 24.9
12 6530 81 1.62 1.87 19.8
13 5180 2.04 15.7
14 4110 64 2.58 2.97 12.4
15 3260 3.25 9.86
16 2580 51 4.09 4.73 7.82
17 2050 5.16 6.20
18 1620 40 6.51 7.51 4.92
19 1290 8.21 3.90
20 1020 32 10.4 11.9 3.09
21 810 13.1 2.45
22 642 25.3 16.5 19.0 1.94
23 509 20.8 1.54
24 404 20.1 26.2 30.2 1.22
25 320 33.0 0.970
26 254 15.9 41.6 48.0 0.769
27 202 52.5 0.610
28 160 12.6 66.2 76.4 0.484
29 127 83.4 0.384
30 101 10 105 121 0.304
31 79.7 133 0.241
32 63.2 8 167 193 0.191
33 50.1 211 0.152
34 39.8 6.3 266 307 0.120
35 31.6 335 0.095
36 25.0 5 423 488 0.076
37 19.8 533 0.060
38 15.7 4 673 776 0.048
39 12.5 848 0.038
40 9.9 3.1 1070 1230 0.020

*) solid strand

  • 1 lb = 0.4536 kg
  • 1 ft (foot) = 0.3048 m
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