Topics

dBm to Watt Conversion Table

dBm Watts dBm Watts dBm Watts
0 1.0 mW 16 40 mW 32 1.6 W
1 1.3 mW 17 50 mW 33 2.0 W
2 1.6 mW 18 63 mW 34 2.5 W
3 2.0 mW 19 79 mW 35 3.2 W
4 2.5 mW 20 100 mW 36 4.0 W
5 3.2 mW 21 126 mW 37 5.0 W
6 4 mW 22 158 mW 38 6.3 W
7 5 mW 23 200 mW 39 8.0 W
8 6 mW 24 250 mW 40 10 W
9 8 mW 25 316 mW 41 13 W
10 10 mW 26 398 mW 42 16 W
11 13 mW 27 500 mW 43 20 W
12 16 mW 28 630 mW 44 25 W
13 20 mW 29 800 mW 45 32 W
14 25 mW 30 1.0 W 46 40 W
15 32 mW 31 1.3 W 47 50 W

As defined in FCC part 15.247(i), the power transmitted by a Wi-Fi device to an antenna can only have a maximum power level of 30dBm (1W).

The FCC does allow a maximum of 36dBm (4W) Effective Isotropic Radiated Power (EIRP) out the antenna (i.e. 30dBm transmitter plus 6dBi antenna gain). Transmitted power must be configured correctly to prevent potential interference problems due to the  EIRP exceeding the limits as defined in FCC part 15.247(i). See the topic on FCC Regulation for further information.


Copyright © 2009-2011 Bitstorm Inc. All rights reserved.