Radiated Power Measurement

Power Ratio dBm or dBmW

The power compared to a 1 milliwatt (1mW) source, expressed in decibels ( dB)

Formula:

<math> x = 10 \log_{10}(P/1 \ \mathrm{mW}) \, </math>

Where P is the power in watts (W)

This roughly equates to:

  • Double the power = 3dB increase in dBm
  • Halve the power = 3dB decrease in dBm
dBm levelPower
80 dBm100 kW
60 dBm1 kW = 1000 W
50 dBm100 W
40 dBm10 W
36 dBm4 W
33 dBm2 W
30 dBm1 W = 1000 mW
27 dBm500 mW
26 dBm400 mW
25 dBm316 mW
24 dBm250 mW
23 dBm200 mW
22 dBm160 mW
21 dBm125 mW
20 dBm100 mW
15 dBm32 mW
10 dBm10 mW
6 dBm4.0 mW
5 dBm3.2 mW
4 dBm2.5 mW
3 dBm2.0 mW
2 dBm1.6 mW
1 dBm1.3 mW
0 dBm1.0 mW = 1000 µW
−1 dBm794 µW
−3 dBm501 µW
−5 dBm316 µW
−10 dBm100 µW
−20 dBm10 µW
−30 dBm1.0 µW = 1000 nW
−40 dBm100 nW
−50 dBm10 nW
−60 dBm1.0 nW = 1000 pW
−70 dBm100 pW
−80 dBm10 pW
−100 dBm0.1 pW
−111 dBm0.008 pW = 8 fW
−127.5 dBm0.178 fW = 178 aW
−174 dBm0.004 aW
−192.5 dBm0.00004 aW
−∞ dBm0 W

more information can be found here

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