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Maryland Metrics Technical Data Chart:
Electrical Conductors Conversion Chart
International Standard Sizes -
Area & Resistance Annealed Copper Stranded Conductors

B & SG
(AWG)
Nominal Area
inch˛ mm˛ circ mils
Calculated Electrical Area
inch˛ mm˛ circ mils
Standard Resistance
At 20°C (68°F)
(Plain Wire)
 ohm/1000 yd ohm/km
20 - 0.50 1020 .0008042 0.5188 1024 30.38 33.23
20 - - 1020 .0007914 0.5106 1008 30.88 33.77
 
- .001 - - .001018 0.6567 1296 24.01 26.26
- .001 - - .000924 0.5961 1176 26.45 28.92
- - 0.75 - .001195 0.7707 1521 20.46 22.37
18 - - 1620 .00128 0.8239 1630 19.16 20.95
18 - - 1620 .001249 0.8057 1590 19.57 21.40
 
- .0015 - - .001521 0.9810 1936 16.07 17.58
- - 1.0 - .001590 1.026 2025 15.36 16.80
- - 1.0 - .001562 1.008 1989 15.64 17.11
 
- .002 - - .001943 1.253 2474 12.58 13.76
16 - - 2580 .00203 1.308 2585 12.06 13.19
16 - - 2580 .001993 1.286 2537 12.26 13.41
- - 1.5 - .002376 1.533 3025 10.29 11.25
- - 1.5 - .002384 1.538 3035 10.25 11.21
 
- .003 - - .002994 1.931 3812 8.163 8.927
- .003 - - .003217 2.075 4096 7.596 8.307
14 - - 4110 .00323 2.082 4113 7.572 8.281
14 - - 4110 .003166 2.042 4031 7.719 8.442
- - 2.5 - .003959 2.554 5041 6.172 6.750
- - 2.5 - .003941 2.542 5017 6.201 6.782
 
- .0045 - - .004546 2.933 5788 5.375 5.879
12 - - 6530 .00513 3.308 6532 4.766 5.212
12 - - 6530 .005028 3.244 6402 4.860 5.315
- - 4 - .006221 4.014 7921 3.928 4.296
- - 4 - .006249 4.032 7956 3.911 4.277
 
- .007 - - .007005 4.520 8920 3.489 3.815
10 - - 10380 .008155 5.261 10380 2.996 3.277
10 - - 10380 .008012 5.169 10200 3.050 3.335
- - 6 - .009331 6.020 11880 2.619 2.864
- - 6 - .009535 6.152 12140 2.563 2.803
9 - - 13090 .01028 6.634 13090 2.377 2.600
9 - - 13090 .01009 6.508 12840 2.422 2.649
- .01 - - .01046 6.751 13320 2.335 2.555
8 - - 16510 .01297 8.366 16510 1.884 2.061
8 - - 16510 .01277 8.237 16260 1.914 2.093
 
- .0145 - - .01462 9.430 18610 1.672 1.828
- - 10 - .01561 10.07 19880 1.565 1.711
- - 10 - .01576 10.17 20070 1.550 1.695
7 - - 20820 .01635 10.55 20820 1.494 1.634
7 - - 20820 .01606 10.36 20440 1.522 1.664
 
6 - - 26240 .02061 13.30 26240 1.185 1.296
6 - - 26240 .02025 13.06 25780 1.207 1.320
 
- .0225 - - .02214 14.28 28190 1.104 1.207
- - 16 - .02499 16.12 31820 0.9777 1.069
5 - - 33090 .02559 16.51 32580 0.9550 1.044
- .03 - - .02835 18.29 36100 0.8619 0.9425
4 - - 41740 .03222 20.78 41020 0.7585 0.8295
- - 25 - .03905 25.19 49720 0.6257 0.6843
 
- .04 25 - .03960 25.55 50420 0.6171 0.6748
3 - - 52620 .04063 26.21 51730 0.6014 0.6577
2 - - 66360 .05128 33.08 65290 0.4765 0.5211
- - 35 - .05405 34.87 68820 0.4521 0.4944
- - 35 - .05450 35.16 69390 0.4484 0.4904
 
- .06 - - .05999 38.70 76380 0.4074 0.4455
1 - - 83690 .06457 41.66 82210 0.3784 0.4139
- .075 - - .07592 48.98 96660 0.3219 0.3520
- - 50 - .07805 50.35 99380 0.3131 0.3424
1/0 - - 105600 .08129 52.44 103500 0.3006 0.3288
 
- .1 - - .1009 65.09 128500 0.2422 0.2649
2/0 - - 133100 .1026 66.19 130600 0.2382 0.2605
- - 70 - .1083 69.87 137900 0.2256 0.2467
 
- .12 - - .1168 75.33 148700 .2093 .2289
3/0 - - 167800 .1294 83.49 164800 .1888 .2065
3/0 - - 167800 .1291 83.29 164400 .1893 .2070
- - 95 - .1494 96.39 190200 .1636 .1789
 
- .15 95 - .1478 95.34 188100 .1654 .1808
4/0 - - 211600 .1630 105.2 207500 .1499 .1639
- - 120 - .1870 120.7 238100 .1307 .1429
- - - 250000 .1926 124.3 245200 .1269 .1388
- .20 - - .1964 126.7 250000 .1244 .1361
- - 150 300000 .2309 149.0 294000 .1058 .1157
- .25 - - .2465 159.1 313900 .09911 .1084
- - - 350000 .2699 174.1 343600 .09055 .09903
- - 185 - .2851 183.9 363000 .08572 .09375
 
- .3 - - .3024 195.1 385000 .08081 .08837
- - - 400000 .3083 198.9 392500 .07926 .08668
- - 240 - .3705 239.0 471700 .06596 .07214
- - 240 - .3722 240.0 473900 .06566 .07181
- - - 500000 .3849 248.3 490100 .06349 .06943
- - - 500000 .3648 248.3 490000 .06350 .06944
 
- .4 - - .4064 262.2 517400 .06013 .06576
- - 300 - .4605 297.1 586500 .05306 .05803
- - - 600000 .4624 298.3 588700 .05285 .05780
 
- .5 - - .4985 321.6 634700 .04902 .05361
- - - 700000 .5389 347.7 686200 .04534 .04959
- - - 750000 .5779 372.8 735800 .04229 .04625
- - - 750000 .5778 372.8 735700 .04229 .04625
 
- .6 - - .6062 391.1 771800 .04032 .04409
- - 400 - .6106 393.9 777400 .04002 .04377
- - - 800000 .6160 397.4 784300 .03967 .04338
- - - 800000 .6166 397.8 785100 .03963 .04334
- .75 - - .7435 479.7 946700 .03287 .03594
- - 500 1000000 0.7698 496.6 980100 .03174 .03472
- - - 1000000 0.7697 496.6 980100 .03175 .03472
 
- 0.85 - - 0.8459 545.8 1077000 .02889 .03159
- - 625 - 0.9594 619.0 1222000 .02547 .02786
- - - 1250000 0.9627 621.1 1226000 .02538 .02776
- - - 1250000 0.9625 620.9 1225000 .02539 .02777
 
- 1.0 - - 1.0376 669.4 1321000 .02355 .02575
- - - 1500000 1.155 745.5 1471000 .02115 .02313
- - - 1500000 1.156 745.6 1471000 .02115 .02312
- - 800 - 1.221 787.7 1555000 .02001 .02188
 
- 1.25 - - 1.227 791.5 1562000 .01992 .02178
- 1.5 - - 1.490 961.3 1897000 .01640 .01794
- - 1000 - 1.514 976.8 1928000 .01614 .01765
- - - 2000000 1.540 993.8 1961000 .01586 .01735
- - - 2000000 1.541 993.9 1962000 .01586 .01735
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