Power Chart
When looking at specs for various wireless network cards you may see the power output quoted as dBm. The following chart gives an approximate conversion to mW (1 Watt = 0.001 mW).
13 dBm = 20 mW
14 dBm = 30 mW
15 dBm = 35 mW
16 dBm = 40 mW
17 dBm = 50 mW
18 dBm = 60 mW
19 dBm = 80 mW
20 dBm = 100 mW