dBm to Watts Conversion (Vice-Versa)

dBm is an abbreviation for the power ratio in decibel (dB) of the measured power referenced to one milliwatt (mW). It is used in radio, microwave and fiber optic work as a convenient measure of absolute power because of its capability to express both very large and very small values in a short form.


Enter Power value in any one of the box to find the other.

Power value in dBm: dBm
Power Value in watts: watts


Formula for Watts to dBm :

P(dBm) = 10 * log10 (P(w)) + 30

Formula for dBm to Watts :

P(watt) = 10P(dBm)/10 / 1000


Conversion Table of Power

Power(dBm) Power(Watts)
-3 dBm 0.0005 watts
-2 dBm 0.0006 watts
-1 dBm 0.0008 watts
0 dBm 0.001 watts
1 dBm 00013 watts
2 dBm 0.0016 watts
3 dBm 0.002 watts
4 dBm 0.0025 watts
5 dBm 0.0032 watts
6 dBm 0.004 watts
7 dBm 0.005 watts
8 dBm 0.0063 watts
Power(Watts) Power(dBm)
0 watts not defined
0+ watts -infinity dBm
0.00001 watts -20 dBm
0.0001 watts -10 dBm
0.001 watts 0 dBm
0.01 watts 10 dBm
0.1 watts 20 dBm
1 watts 30 dBm
10 watts 40 dBm
100 watts 50 dBm
1000 watts 60 dBm
10000 watts 70 dBm

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