This page allows you to calculate between dBm, dBW, µW, mW, Watts, Kilowatts and Megawatts.
The decibel watt (dBW) is a unit for the measurement of the strength of a signal expressed in decibels relative to one watt. It is used because of its capability to express both very large and very small values of power in a short range of number, eg 1 milliwatt = -30 dBW, 1 watt = 0 dBW, 10 watts = 10 dBW, 100 watts = 20 dBW and 1,000,000 W = 60 dBW.
dBm is referenced to one milliwatt (0.001 W). dBW value in dBm is always 30 more because 1 watt is 1000 milliwatts, and ratio of 1000 (in power) is 30 dB, eg 10 dBm (10mW) is equal to -20 dBW (0.01 W).
Input a value above, select the type of unit you wish to convert, and click the ‘Convert My Power’ button. All calculated values will be shown. Note, values are also calculated whenever the ’round’ buttons are pressed too.