The table below gives some data for wire diamaters for American Wire Gauge or "AWG", and Standard Wire Gauge or "SWG".

Wire:
Bare Dia. mm Bare Dia. in. AWG SWG Enamel tpi D.C. Ohms per foot
0.28930 1 0.1264
0.25760 2 0.1593
0.22940 3 0.2009
0.20430 4 0.2533
0.18190 5 0.3195
0.16200 6 0.4028
0.14430 7 0.5080
0.12860 8 0.6405
0.11440 9 0.8077
2.640 0.10400 12 9.09
2.590 0.10190 10 9.60 1.0180
2.340 0.09200 13 10.20
2.305 0.09700 11 10.70 1.2840
2.040 0.08000 12 14 11.90 1.6190
1.820 0.07200 13 15 13.17 2.0420
1.630 0.06400 14 16 15.00 2.5240
1.450 0.05710 15 16.80 3.1810
1.420 0.05600 17 16.90
1.290 0.05080 16 18.90 4.0180
1.220 0.04800 18 19.70
1.150 0.04530 17 21.20 5.0540
1.020 0.04000 18 19 23.50 6.3860
0.910 0.03600 19 20 26.20 8.0460
0.812 0.03200 20 21 29.20 10.1300
0.720 0.02800 21 22 33.00 12.7700
0.644 0.02530 22 37.00 16.2000
0.610 0.02400 23 38.30
0.573 0.02260 23 41.30 20.3000
0.560 0.02200 24 41.60
0.510 0.02000 24 25 45.50 25.6700
0.460 0.01800 25 26 51.00 32.3700
0.420 0.01640 27 55.10
0.405 0.01590 26 58.00 41.0200
0.380 0.01480 28 61.00
0.361 0.01420 27 64.90 51.4400
0.350 0.01360 29 66.00
0.320 0.01250 28 30 72.50 65.3100
0.290 0.01160 31 77.50
0.286 0.01130 29 81.60 81.2100
0.270 0.01080 32 82.70
0.255 0.01000 30 33 88.00 103.7000
0.230 0.00920 34 98.30
0.227 0.00890 31 101.0 130.9000
0.210 0.00840 35 105.8
0.00800 32 162.0000
0.00710 33 205.7000
0.00630 34 261.3000
0.00560 35 330.7000
0.00500 36 414.8000
0.00450 37 512.1000
0.00400 38 648.2000
0.00360 39 846.6000
0.00310 40 1079.0000
0.00280 41 1323.0000
0.00250 42 1659.0000
0.00220 43 2143.0000
0.00200 44 2593.0000
0.00176 45 3348.0000
0.00157 46 4207.0000
0.00140 47 5291.0000