dBm vs Milliwatts

Deci-Bell relative to 1-milliwatt (dBm) is a measure of absolute power, it's a convenient unit to use because path and link calculations typically work with dB and dBm calculations can be seamless folded into that calculation.
dBm= 10*(10logP)
20dBm= 10*(10log100mW)
30dBm = 1 Watt

Deci-Bell relative to 1-milliwatt (dBm) is a measure of absolute power, it's a convenient unit to use because path and link calculations typically work with dB and dBm calculations can be seamless folded into that calculation.