Single Core Copper Wire Size Chart

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This table relates the 5 major metric and imperial wire size standards
to their corresponding wire diameters and cross sectional areas.

IEC International Electrotechnical Commission
JIS Japanese Industrial Standards
ANSI American National Standards Institute
BSI British Standards Institution
AWG American Wire Gauge
SWG British Standard Wire Gauge
(std) Value provided by standard
(calc) Calculated value (mostly)


Formulas for calculating resistance are given in the table footnotes.

ROUND SINGLE-CORE COPPER WIRE SIZE CHART
Actual Bare Wire Dimensions * Wire Size Standard Designation **
(std)
mil⌀
(calc)
mil ²
(std)
mm⌀
(calc)
mm ²
IEC
mm ²
IEC
mm⌀
JIS
mm⌀
ANSI
AWG
BSI
SWG
1404.8 1550000
35.682 1000
1000        
1256.5 1240000
31.915 800.0
800        
1115.0 976400
28.322 630.0
630        
993.4 775100
25.231 500.0
500        
888.5 620000
22.568 400.0
400        
769.5 465100
19.544 300.0
300        
688.2 372000
17.481 240.0
240        
604.2 286700
15.348 185.0
185        
580.0 264200
14.732 170.5
      6/0  
544.1 232500
13.820 150.0
150        
516.5 209500
13.119 135.2
      5/0  
500.0 196400
12.700 126.7
        7/0
486.6 186000
12.361 120.0
120        
464.0 169100
11.786 109.1
        6/0
460.0 166200
11.684 107.2
      4/0  
433.0 147300
10.998 95.00
95        
432.0 146600
10.973 94.57
        5/0
409.6 131800
10.404 85.01
      3/0  
400.0 125700
10.160 81.07
        4/0
393.7 121700
10.000 78.54
    10    
372.0 108700
9.449 70.12
        3/0
371.7 108500
9.441 70.00
70        
364.8 104500
9.266 67.43
      2/0  
354.3 98590
9.000 63.62
    9    
348.0 95120
8.839 61.36
        2/0
324.9 82910
8.252 53.48
      1/0  
324.0 82450
8.230 53.20
        1/0
315.0 77930
8.000 50.27
    8    
314.1 77490
7.979 50.00
50        
306.6 73830
7.787 47.62
      0.5  
300.0 70690
7.620 45.60
        1
289.3 65730
7.348 42.41
      1  
279.5 61360
7.100 39.59
  7.1      
276.0 59830
7.010 38.60
        2
275.6 59660
7.000 38.49
    7    
273.0 58540
6.934 37.76
      1.5  
263.8 54660
6.700 35.26
  6.7      
262.8 54240
6.676 35.00
35        
257.6 52120
6.543 33.62
      2  
255.9 51430
6.500 33.18
    6.5    
252.0 49880
6.401 32.18
        3
248.0 48310
6.300 31.17
  6.3      
243.1 46420
6.175 29.95
      2.5  
236.2 43820
6.000 28.27
  6 6    
232.0 42270
5.893 27.28
        4
229.4 41330
5.827 26.67
      3  
222.1 38740
5.642 25.00
25        
220.5 38190
5.600 24.63
  5.6      
216.5 36810
5.500 23.76
    5.5    
216.5 36810 5.499 23.75
      3.5  
212.0 35300
5.385 22.78
        5
208.7 34210
5.300 22.06
  5.3      
204.3 32780
5.189 21.15
      4  
196.9 30450
5.000 19.64
  5 5    
192.8 29200
4.897 18.83
      4.5  
192.0 28950
4.877 18.68
        6
187.0 27470
4.750 17.72
  4.75      
181.9 25990
4.620 16.76
      5  
177.7 24800
4.514 16.00
16        
177.2 24660
4.500 15.90
  4.5 4.5    
176.0 24330
4.470 15.69
        7
171.7 23150
4.361 14.94
      5.5  
167.3 21980
4.250 14.19
  4.25      
162.0 20610
4.115 13.30
      6  
160.0 20110
4.064 12.97
        8
157.5 19480
4.000 12.57
  4 4    
152.9 18360
3.884 11.85
      6.5  
147.6 17110
3.750 11.05
  3.75      
144.3 16350
3.665 10.55
      7  
144.0 16290
3.658 10.51
        9
140.5 15500
3.568 10.00
10        
139.8 15350
3.550 9.898
  3.55      
137.8 14910
3.500 9.621
    3.5    
136.2 14570
3.459 9.397
      7.5  
131.9 13660
3.350 8.814
  3.35      
128.5 12970
3.264 8.367
      8  
128.0 12870
3.251 8.301
        10
126.0 12470
3.200 8.042
    3.2    
124.0 12080
3.150 7.793
  3.15      
121.3 11560
3.081 7.455
      8.5  
118.1 10950
3.000 7.069
  3 3    
116.0 10570
2.946 6.816
        11
114.4 10280
2.906 6.633
      9  
114.2 10240
2.900 6.605
    2.9    
110.2 9538
2.800 6.158
  2.8 2.8    
108.8 9297
2.764 6.000
6        
108.0 9161
2.743 5.909
      9.5  
106.3 8875
2.700 5.726
    2.7    
104.3 8544
2.650 5.515
  2.65      
104.0 8495
2.642 5.482
        12
102.4 8235
2.600 5.309
    2.6    
101.9 8155
2.588 5.260
      10  
98.43 7609
2.500 4.909
  2.5 2.5    
96.20 7268
2.443 4.687
      10.5  
94.49 7012
2.400 4.524
    2.4    
92.91 6780
2.360 4.374
  2.36      
92.00 6648
2.337 4.290
        13
90.70 6461
2.304 4.169
      11  
90.55 6440
2.300 4.155
    2.3    
88.85 6200
2.257 4.000
4        
88.19 6108
2.240 3.941
  2.24      
86.61 5892
2.200 3.801
    2.2    
85.60 5755
2.174 3.712
      11.5  
83.46 5471
2.120 3.530
  2.12      
82.68 5369
2.100 3.464
    2.1    
80.80 5128
2.052 3.307
      12  
80.00 5027
2.032 3.243
        14
78.74 4869
2.000 3.142
  2 2    
76.30 4572
1.938 2.950
      12.5  
74.80 4394
1.900 2.835
  1.9 1.9    
72.00 4072
1.829 2.627
      13  
72.00 4072
1.829 2.627
        15
70.87 3945
1.800 2.545
  1.8 1.8    
70.24 3875
1.784 2.500
2.5        
67.90 3621
1.725 2.337
      13.5  
66.93 3518
1.700 2.270
  1.7 1.7    
64.10 3227
1.628 2.082
      14  
64.00 3217
1.626 2.077
        16
62.99 3116
1.600 2.011
  1.6 1.6    
60.50 2875
1.537 1.855
      14.5  
59.06 2740
1.500 1.767
  1.5 1.5    
57.10 2561
1.450 1.651
      15  
56.00 2463
1.422 1.588
        17
55.12 2386
1.400 1.539
  1.4 1.4    
54.41 2325
1.382 1.500
1.5        
53.90 2282
1.369 1.472
      15.5  
51.97 2121
1.320 1.369
  1.32      
51.18 2057
1.300 1.327
    1.3    
50.80 2027
1.290 1.307
      16  
49.21 1902
1.250 1.227
  1.25      
48.00 1810
1.219 1.167
        18
48.00 1810
1.219 1.167
      16.5  
47.24 1753
1.200 1.131
    1.2    
46.46 1695
1.180 1.094
  1.18      
45.30 1612
1.151 1.041
      17  
44.42 1550
1.128 1.000
1        
44.09 1527
1.120 .9852
  1.12      
43.31 1473
1.100 .9503
    1.1    
42.70 1432
1.085 .9246
      17.5  
41.73 1368
1.060 .8825
  1.06      
40.30 1276
1.024 .8235
      18  
40.00 1257
1.016 .8107
        19
39.37 1217
1.000 .7854
  1 1    
38.47 1162
.9772 .7500
.75        
38.00 1134
.9650 .7314
      18.5  
37.40 1099
.9500 .7088
  .95 .95    
36.00 1018
.9144 .6567
        20
35.90 1012
.9120 .6533
      19  
35.43 985.9
.9000 .6362
  .9 .9    
33.90 902.6
.8610 .5822
      19.5  
33.46 879.3
.8500 .5675
  .85 .85    
32.00 804.2
.8130 .5191
      20  
32.00 804.2
.8128 .5189
        21
31.50 779.3
.8000 .5027
  .8 .8    
31.41 774.9
.7979 .5000
.5        
30.20 716.3
.7670 .4620
      20.5  
29.53 684.9
.7500 .4418
  .75 .75    
28.50 638.0
.7240 .4117
      21  
28.00 615.8
.7112 .3973
        22
27.95 613.6
.7100 .3959
  .71      
27.56 596.6
.7000 .3849
    .7    
27.39 589.2
.6956 .3800
.38        
26.90 568.3
.6830 .3664
      21.5  
26.38 546.6
.6700 .3526
  .67      
25.90 526.9
.6580 .3400
.34        
25.59 514.3
.6500 .3318
    .65    
25.30 502.7
.6430 .3247
      22  
24.80 483.1
.6300 .3117
  .63      
24.00 452.4
.6096 .2919
        23
23.90 448.6
.6070 .2894
      22.5  
23.62 438.2
.6000 .28274
  .6 .6    
22.60 401.2
.5740 .2588
      23  
22.21 387.4
.5642 .2500
.25        
22.05 381.9
.5600 .2463
  .56      
22.00 380.1
.5588 .2453
        24
21.65 368.1
.5500 .2376
    .55    
21.30 21.30
.5410 .22987
      23.5  
20.87 342.1
.5300 .2206
  .53      
20.10 317.3
.5110 .2051
      24  
20.00 314.2
.5080 .2027
        25
19.69 304.5
.5000 .1964
  .5 .5    
19.00 283.6
.4830 .1832
      24.5  
18.70 274.7
.4750 .1772
  .475      
18.00 254.5
.4572 .16417
        26
17.90 251.7
.4550 .1626
      25  
17.72 246.6
.4500 .1590
  .45 .45    
16.90 224.3
.4290 .1446
      25.5  
16.73 219.8
.4250 .1419
  .425      
16.62 217.0
.4222 .1400
.14        
16.40 211.2
.4166 .1363
        27
15.90 198.6
.4040 .1282
      26  
15.75 194.8
.4000 .1257
  .4 .4    
15.00 176.7
.3810 .1140
      26.5  
14.80 172.0
.3759 .1110
        28
14.77 171.3
.3750 .1105
  .375      
14.57 166.7
.3700 .1075
    .37    
14.20 158.4
.3610 .1024
      27  
13.98 153.5
.3550 .09898
  .355      
13.78 149.1
.3500 .09621
    .35    
13.60 145.3
.3454 .09370
        29
13.40 141.0
.3400 .09080
      27.5  
13.33 139.6
.3385 .09000
.09        
13.19 136.6
.3350 .08814
  .335      
12.60 124.7
.3200 .08042
    .32    
12.60 124.7
.3200 .08042
      28  
12.57 124.1
.3192 .08000
.08        
12.40 120.8
.3150 .07793
  .315      
12.40 120.8
.3150 .07793
        30
11.90 111.2
.3020 .07163
      28.5  
11.81 109.5
.3000 .07069
  .3 .3    
11.60 105.7
.2946 .06816
        31
11.42 102.4
.2900 .06605
    .29    
11.30 100.3
.2870 .06469
      29  
11.02 95.38
.2800 .06158
  .28 .28    
10.80 91.60
.2743 .05909
        32
10.63 88.75
.2700 .05726
    .27    
10.60 88.25
.2690 .05683
      29.5  
10.43 85.44
.2650 .05515
  .265      
10.24 82.35
.2600 .05309
    .26    
10.00 78.54
.2540 .05067
      30  
10.00 78.54
.2540 .05067
        33
9.934 77.50
.2523 .05000
.05        
9.843 76.10
.2500 .04909
  .25 .25    
9.500 70.88
.2410 .04562
      30.5  
9.449 70.12
.2400 .04524
    .24    
9.291 67.80
.2360 .04374
  .236      
9.200 66.48
.2337 .04290
        34
9.055 64.40
.2300 .04155
    .23    
8.900 62.21
.2260 .04012
      31  
8.819 61.08
.2240 .03941
  .224      
8.661 58.92
.2200 .03801
    .22    
8.400 55.42 .2134 .03577
        35
8.400 55.42
.2130 .03563
      31.5  
8.347 54.72
.2120 .03530
  .212      
8.311 54.25
.2111 .03500
.035        
8.268 53.69
.2100 .03464
    .21    
8.000 50.27
.2030 .03237
      32  
7.874 48.69
.2000 .03142
  .2 .2    
7.600 45.37
.1930 .02926
        36
7.500 44.18
.1910 .02865
      32.5  
7.480 43.94
.1900 .02835
  .19 .19    
7.100 39.59
.1800 .02545
      33  
7.087 39.45
.1800 .02545
  .18 .18    
6.800 36.32
.1727 .02343
        37
6.700 35.26
.1700 .02270
      33.5  
6.693 35.18
.1700 .02270
  .17 .17    
6.300 31.17
.1600 .02011
      34  
6.299 31.16
.1600 .02011
  .16 .16    
6.000 28.27
.1524 .01824
        38
5.906 27.40
.1500 .01767
  .15 .15    
5.900 27.34
.1500 .01767
      34.5  
5.600 24.63
.1420 .01584
      35  
5.512 23.86
.1400 .01539
  .14 .14    
5.300 22.06
.1350 .01431
      35.5  
5.200 21.24
.1321 .01371
        39
5.197 21.21
.1320 .01369
  .132      
5.118 20.57
.1300 .01327
    .13    
5.000 19.64
.1270 .01267
      36  
4.921 19.02
.1250 .01227
  .125      
4.800 18.10
.1219 .01167
        40
4.724 17.53
.1200 .01131
    .12    
4.700 17.35
.1190 .01112
      36.5  
4.646 16.95
.1180 .01094
  .118      
4.500 15.90
.1140 .01021
      37  
4.409 15.27
.1120 .009852
  .112      
4.400 15.21
.1118 .009817
        41
4.331 14.73
.1100 .009503
    .11    
4.173 13.68
.1060 .008825
  .106      
4.200 13.85
.1070 .008992
      37.5  
4.000 12.57
.1020 .008171
      38  
4.000 12.57
.1016 .008107
        42
3.937 12.17
.1000 .007854
  .1 .1    
3.740 10.99
.0950 .007088
  .095      
3.700 10.75
.0940 .006940
      38.5  
3.600 10.18
.0914 .006561
        43
3.543 9.859
.0900 .006362
  .09 .09    
3.500 9.621
.0890 .006221
      39  
3.347 8.798
.0850 .005675
  .085      
3.300 8.553
.0840 .005542
      39.5  
3.200 8.042
.0813 .005191
        44
3.150 7.793
.0800 .005027
  .08 .08    
3.100 7.548
.0790 .004902
      40  
3.000 7.069
.0760 .004537
      40.5  
2.953 6.849
.0750 .004418
  .075      
2.800 6.158
.0711 .003970
        45
2.800 6.158
.0710 .003959
      41  
2.795 6.136
.0710 .003959
  .071      
2.756 5.966
.0700 .003849
    .07    
2.638 5.309
.0670 .003526
  .067      
2.600 5.309
.0660 .003421
      41.5  
2.500 4.909
.0640 .003217
      42  
2.480 4.831
.0630 .003117
  .063      
2.400 4.524
.0610 .002923
        46
2.400 4.524
.0610 .002923
      42.5  
2.362 4.382
.0600 .002827
  .060 .06    
2.205 3.819
.0560 .002463
  .056      
2.200 3.801
.0560 .002463
      43  
2.100 3.464
.0530 .002206
      43.5  
2.087 3.421
.0530 .002206
  .053      
2.000 3.142
.0510 .002043
      44  
2.000 3.142 .0508 .002027
        47
1.969 3.045
.0500 .001964
  .05 .05    
1.900 2.835
.0480 .001810
      44.5  
1.890 2.806
.0480 .001810
  .048      
1.760 2.433
.0447 .001569
      45  
1.662 2.170
.0422 .001399
      45.5  
1.600 2.011
.0406 .001295
        48
1.575 1.948
.0400 .001257
    .04    
1.570 1.936
.0399 .001250
      46  
1.480 1.720
.0376 .001110
      46.5  
1.400 1.539
.0356 .0009954
      47  
1.318 1.364
.0335 .0008814
      47.5  
1.240 1.208
.0315 .0007793
      48  
1.200 1.131
.0305 .0007306
        49
1.181 1.095
.0300 .0007069
    .03    
1.117 .9800
.0298 .0006975
      48.5  
1.110 .9677
.0282 .0006246
      49  
1.045 .8577
.0265 .0005515
      49.5  
1.000 .7854
.0254 .0005067
        50
.990 .7698
.0251 .0004948
      50  
.984 .7605
.0250 .0004909
    .025    
.931 .6808
.0236 .0004374
      50.5  
.880 .6082
.0224 .0003941
      51  
.829 .5398
.0211 .0003497
      51.5  
.787 .4865
.0200 .0003142
    .02    
.780 .4778
.0198 .0003079
      52  
.738 .4278
.0187 .0002747
      52.5  
.700 .3849
.0178 .0002489
      53  
.657 .3390
.0167 .0002190
      53.5  
.620 .3019
.0157 .0001936
      54  
.585 .2688
.0149 .0001744
      54.5  
.550 .2376
.0140 .0001539
      55  
.521 .2132
.0132 .0001369
      55.5  
.490 .1886
.0124 .0001208
      56  
.464 .1691
.0118 .0001094
      56.5  
.438 .1507
.0111 .00009677
      57  
.413 .1340
.0105 .00008659
      57.5  
.390 .1195
.00991 .00007713
      58  
.368 .1064
.00935 .00006866
      58.5  
.347 .09457
.00882 .00006110
      59  
.328 .08450
.00833 .00005450
      59.5  
.309 .07499
.00786 .00004852
      60  
This table was double checked but accuracy is not guaranteed so use it at your own risk!
Be aware that that 1550000 mil2 = 1.55 inch2 and .00004852 mm2 = 48.52 μm2 thanks!
* Small discrepancies between mil and mm diameters is reflected in the relevant standards.
** Some defacto standard sizes are included alongside the associated technical standards.
Resistance of pure Cu wire at 20°C in ohms-per-1000m = 21.9528 ÷ wire-size-in-mm ²
Resistance of pure Cu wire at 20°C in ohms-per-1000ft = 10371.4 ÷ wire-size-in-mil ²

Q: I want to report a problem:

Some of the dimensions are given in in only 3 significant digits while others are shown in 5.
Some of the mil sizes don't match the mm sizes in accordance with normal unit conversion factors.
Dimensions are all slightly out of whack compared to calculated sizes obtained from a wire size formula.

A: Okay grasshopper but...

Look at the official standard document to see how each specific wire size is specified.
While it is possible and perhaps likely that the above table contains some mistakes,
chances are that the anomaly you noticed is actually built into the official standard.
Some standards actually quote slightly discrepant values between mil and mm sizes.
Most standards specify tabular sizes instead of invoking a mathematical formula.
If you can prove that the issue is in fact real then please email me and I will fix it.


Safety, accuracy and completeness of information provided herein is not guaranteed,
so be inspired by it but do not use it as a basis for experimentation or other actions.

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