I've found this difficult to get all in one place!

SWG AWG equivalent diameter (in) diameter (mm) area (mm2)
10 8 0.128 3.25 8.30
12 10 0.104 2.64 5.48
14 12 0.08 2.03 3.24
16 14 0.064 1.63 2.08
18 17 0.048 1.22 1.17
20 19 0.036 0.91 0.66
21 20 0.032 0.81 0.52
22 21 0.028 0.71 0.40
23 22 0.024 0.61 0.29
24 23 0.022 0.56 0.25
25 24 0.02 0.51 0.20
26 25 0.018 0.46 0.16
27 26 0.0164 0.42 0.14
28 27 0.015 0.38 0.11
29 27 0.0136 0.35 0.09
30 28 0.0124 0.31 0.08
31 29 0.0116 0.29 0.07
32 30 0.0108 0.27 0.06