Conductor Properties







Annealed Copper
 Size Diameter Cross Sectional Area
Resistance Indiv. Strands
AWG mm mil Square
mm

Square
In.
Circular
Mils
Ω /
km
Ω /
1,000 ft
No. Dia.
In.
4/0 13.4112 528 107.219 0.1662 211,600 0.1996
0.0608 19 0.1055
3/0 11.9380 470 85.025 0.1318 167,800 0.2512
0.0766
19 0.0940
2/0 10.6426 419 67.443
0.1045 133,100 0.3170
0.0967
19 0.0837
1/0 9.4742 373 53.458
0.08286 105,500 0.399
0.122
19 0.0745
1 8.4328 332 42.406
0.06573 83,690 0.505
0.154
19 0.0664
2 7.4168 292 33.630
0.05213 66,370 0.634
0.194
7 0.0974
3 6.6040 260 26.673
0.04134 52,640 0.802
0.245
7 0.0867
4 5.8928 232 21.150
0.03278 41,740 1.010
0.308 7 0.0772
6 4.6736 184 13.301
0.02062 26,250 1.608
0.491 7 0.0612
8 3.7084 146 8.366
0.01297 16,510 2.551
0.778 7 0.0486
8 3.2636
128
8.366
0.01297
16,510
2.506
0.764
1

10 2.9464 116 5.260
0.008152 10,380 4.070
1.24 7 0.0385
10 2.588
102
5.260
0.008152
10,308
3.984
1.21 1

12 2.3241 91.5 3.309
0.005129 6,530 6.50
1.98 7 0.0305
12 2.05
81
3.309
0.005129
6,530
6.34
1.93
1
 
14 1.8440 72.6 2.081
0.003226 4,107 10.3
3.14
7 0.0242
14 1.63
640 2.081
0.003226
4,107
10.1
3.07
1

16 1.4630 57.6 1.309
0.002029 2,583 16.4
4.99 7 0.0192
16
1.29
510
1.309
0.002029
2,583
16.0
4.89
1

18 1.1582 45.598 0.823
0.001275 1,624 26.1
7.95
7 0.0152
18
1.02
40.157
0.823
0.001275
1,624
25.5
7.77
1

20 0.9220 36.299 0.518
0.0008027 1,022 34.58
10.54
7 0.0121
22
0.6438
25.347
0.326
0.00050458
642.328
52.99
16.15
1

23
0.573
22.559
0.258
0.0003999
509.034
66.79
20.36
1

24
0.5106
20.101
0.205
0.00031733
403.964
84.19
25.66
1

26
0.4049
15.941
0.129
0.00019957
254.056
133.99
40.84
1


Notes:
  1. Data from the National Electric Code (NFPA 70-2014), Chapter 9, Table 8; and other sources.
  2. AWG = American Wire Gage. See Wikipedia.
  3. 1 mil = 0.001 inches.
  4. A circular mil is the cross-sectional area of a wire one mil in diameter.
  5. Resistance is DC resistance at 75o C (167o F).