Hacking Exposed 5th Edition
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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.
| 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 |