R=r/(Cross Sectional Area) r(Cu)=1.694mW*cm at 20C
r(Cu)=2.263mW*cm at 100C
Typical Wire Table for  Copper Magnet Wire
  Copper Insulated Copper Copper Insulated Copper    
  Diameter Diameter Cross Section Diameter Diameter Cross Section Ohms/CM Ohms/IN
AWG (CM) (CM) (CM^2) (IN) (IN) (IN^2) 100C 100C
10 0.2587 0.2729 5.2564E-02 0.1019 0.1075 8.1474E-03 4.31E-05 1.09E-04
11 0.2304 0.2438 4.1680E-02 0.0907 0.0960 6.4604E-03 5.43E-05 1.38E-04
12 0.2051 0.2178 3.3050E-02 0.0808 0.0858 5.1227E-03 6.85E-05 1.74E-04
13 0.1827 0.1946 2.6206E-02 0.0719 0.0766 4.0620E-03 8.64E-05 2.19E-04
14 0.1627 0.1740 2.0780E-02 0.0640 0.0685 3.2209E-03 1.09E-04 2.77E-04
15 0.1448 0.1555 1.6477E-02 0.0570 0.0612 2.5540E-03 1.37E-04 3.49E-04
16 0.1290 0.1390 1.3066E-02 0.0508 0.0547 2.0252E-03 1.73E-04 4.40E-04
17 0.1149 0.1243 1.0360E-02 0.0452 0.0490 1.6058E-03 2.18E-04 5.55E-04
18 0.1023 0.1112 8.2151E-03 0.0403 0.0438 1.2733E-03 2.76E-04 7.00E-04
19 0.0911 0.0995 6.5141E-03 0.0359 0.0392 1.0097E-03 3.47E-04 8.83E-04
20 0.0811 0.0891 5.1653E-03 0.0319 0.0351 8.0062E-04 4.38E-04 1.11E-03
21 0.0722 0.0797 4.0957E-03 0.0284 0.0314 6.3484E-04 5.53E-04 1.40E-03
22 0.0643 0.0714 3.2477E-03 0.0253 0.0281 5.0339E-04 6.97E-04 1.77E-03
23 0.0573 0.0640 2.5752E-03 0.0225 0.0252 3.9916E-04 8.79E-04 2.23E-03
24 0.0510 0.0573 2.0420E-03 0.0201 0.0226 3.1651E-04 1.11E-03 2.82E-03
25 0.0454 0.0514 1.6192E-03 0.0179 0.0202 2.5097E-04 1.40E-03 3.55E-03
26 0.0404 0.0461 1.2839E-03 0.0159 0.0181 1.9901E-04 1.76E-03 4.48E-03
27 0.0360 0.0413 1.0181E-03 0.0142 0.0163 1.5780E-04 2.22E-03 5.65E-03
28 0.0321 0.0371 8.0726E-04 0.0126 0.0146 1.2513E-04 2.80E-03 7.12E-03
29 0.0285 0.0333 6.4011E-04 0.0112 0.0131 9.9218E-05 3.54E-03 8.98E-03
30 0.0254 0.0299 5.0757E-04 0.0100 0.0118 7.8674E-05 4.46E-03 1.13E-02
31 0.0226 0.0269 4.0247E-04 0.0089 0.0106 6.2383E-05 5.62E-03 1.43E-02
32 0.0202 0.0241 3.1914E-04 0.0079 0.0095 4.9466E-05 7.09E-03 1.80E-02
33 0.0179 0.0217 2.5306E-04 0.0071 0.0085 3.9224E-05 8.94E-03 2.27E-02
34 0.0160 0.0195 2.0066E-04 0.0063 0.0077 3.1102E-05 1.13E-02 2.87E-02
35 0.0142 0.0176 1.5911E-04 0.0056 0.0069 2.4662E-05 1.42E-02 3.61E-02
36 0.0127 0.0158 1.2617E-04 0.0050 0.0062 1.9556E-05 1.79E-02 4.56E-02
37 0.0113 0.0143 1.0004E-04 0.0044 0.0056 1.5506E-05 2.26E-02 5.75E-02
38 0.0100 0.0129 7.9327E-05 0.0040 0.0051 1.2296E-05 2.85E-02 7.25E-02
39 0.0089 0.0116 6.2902E-05 0.0035 0.0046 9.7498E-06 3.60E-02 9.14E-02
40 0.0080 0.0105 4.9877E-05 0.0031 0.0041 7.7310E-06 4.54E-02 1.15E-01
41 0.0071 0.0095 3.9550E-05 0.0028 0.0037 6.1302E-06 5.72E-02 1.45E-01
42 0.0063 0.0085 3.1360E-05 0.0025 0.0034 4.8609E-06 7.22E-02 1.83E-01
43 0.0056 0.0077 2.4867E-05 0.0022 0.0030 3.8544E-06 9.10E-02 2.31E-01
44 0.0050 0.0070 1.9718E-05 0.0020 0.0028 3.0563E-06 1.15E-01 2.92E-01
45 0.0045 0.0063 1.5635E-05 0.0018 0.0025 2.4235E-06 1.45E-01 3.68E-01
46 0.0040 0.0057 1.2398E-05 0.0016 0.0023 1.9217E-06 1.83E-01 4.64E-01