dBm

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0 dBm in the RF terminology 0 dBm is arbitrarily defined as 1 mW of power (.001 Watt).

 dBm = 10 * log(mW)
 mW = 10 (dBm/10)
-10 dBm =   0.1 mW
  0 dBm =   1.0 mW
 10 dBm =  10.0 mW
 17 dBm =  50.0 mW
 19 dBm =  79.0 mW
 20 dBm = 100.0 mW
 21 dBm = 125.0 mW
 22 dBm = 158.0 mW
 23 dBm = 200.0 mW
 24 dBm = 250.0 mW
 25 dBm = 316.0 mW
 26 dBm = 400.0 mW
 27 dBm = 500.0 mW
 28 dBm = 631.0 mW
 29 dBm = 794.0 mw
 30 dBm =    1 Watt
 40 dBm =   10 Watts
 50 dBm =  100 Watts
 60 dBm = 1000 Watts