The dBm from RF Power calculator compute the dBm power ratio based on the RF power.
INSTRUCTIONS: Choose units and enter the following:
RF Power (P): the calculator returns the power in Watts. However, this can be automatically converted to compatible units via the pull-down menu.
The dBm is a logarithmic unit of power, used in radio and microwave electronics. It is the power ratio measured in decibels (dB) with a reference power of 1 mW = 0.001 W. It is calculated using:
The power level in dBm is an absolute measure of power, because it uses the reference power `P_0` = 0.001 W. In contrast, decibels (dB) are a dimensionless logarithmic ratio of two powers:
`dB = 10 log_10(P_2/P_1)`.
Along similar lines,
`dBm = 10 log_10(P/P_0)`.