FT-RF Antenna , Inc. -- dBm to mW Calculator
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Last updated : February 13,2018

dBm to mW Calculator

dBm Definition

dBm is defined as power ratio in decibel (dB) referenced to one milliwatt (mW). It is an abbreviation for dB with respect to 1 mW and the "m" in dBm stands for milliwatt.

dBm is different from dB. dBm represents absolute power, whereas dB is a ratio of two values and is used to represent gain or attenuation. For example, 3 dBm means 2 mW, and 3 dB means a gain of 2. Similarly, -3 dBm means 0.5 mW, whereas -3 dB means attenuation of 2.

The formula to calculate dBm from mW is:

dBm = 10 log10(     P     )
1mW


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