Reference Designer Calculators
dBm to milliWatts and milliwatts to dBm
RF Engineers often express the power in dBm in place of milliWatts or watts. The formula converts a power expressed in dBm to milliWatt ( and also milliwatts to dBm).
Following is the formula for dBm to Watt conversion.
P(dBm) = 10 log10(p/p0)
Where p0 is the reference volatge and is 1mW or 1x10-3 Watts. To Calculate dBm from wattage enter the value in P(milliwatts) and hit P(dBm) button.
To Calculate wattage from dBm enter the value in P(dBms) and hit P(milliwatts) button.