ADDITIONAL RESOURCES

A decibel-to-watts conversion is helpful for identifying the signal strength of a wireless access point or wireless card. Table 8-1 can be utilized to determine the retrieved decibel to the power equivalent. The power equivalent can then be analyzed to determine the estimated strength of the signal.

Table 8-1: Decibel-to-Volts-to-Watts Conversion Table

dBm	V	Po
53	100	200 W
50	70.7	100 W
49	64	80 W
48	58	64 W
47	50	50 W
46	44.5	40 W
45	40	32 W
44	32.5	25 W
43	32	20 W
42	28	16 W
41	26.2	12.5 W
40	22.5	10 W
39	20	8 W
38	18	6.4 W
37	16	5 W
36	14.1	4 W
35	12.5	3.2 W
34	11.5	2.5 W
33	10	2 W
32	9	1.6 W
31	8	1.25 W
30	7.1	1.0 W
29	6.4	800 mW
28	5.8	640 mW
27	5	500 mW
26	4.45	400 mW
25	4	320 mW
24	3.55	250 mW
23	3.2	200 mW
22	2.8	160 mW
21	2.52	125 mW
20	2.25	100 mW
19	2	80 mW
18	1.8	64 mW
17	1.6	50 mW
16	1.41	40 mW
15	1.25	32 mW
14	1.15	25 mW
13	1	20 mW
12	0.9	16 mW
11	0.8	12.5 mW
10	0.71	10 mW
9	0.64	8 mW
8	0.58	6.4 mW
7	0.5	5 mW
6	0.445	4 mW
5	0.4	3.2 mW
4	0.355	2.5 mW
3	0.32	2.0 mW
2	0.28	1.6 mW
1	0.252	1.25 mW
	0.225	1.0 mW
-1	0.2	.80 mW
-2	0.18	.64 mW
-3	0.16	.50 mW
-4	0.141	.40 mW
-5	0.125	.32 mW
-6	0.115	.25 mW
-7	0.1	.20 mW
-8	0.09	.16 mW
-9	0.08	.125 mW
-10	0.071	.10 mW
-11	0.064
-12	0.058
-13	0.05
-14	0.045
-15	0.04
-16	0.0355