Reference Designer Calculators
dBm to Volts
RF Engineers often express the power in dBm. The formula gives voltage value corresponding to a power value in dBm and Vice Versa.
Following is the formula for dBm to RMS voltage conversion.
P(dBm) = 10 log10(v2/(R*p0))
Where p0 is the reference wattage and is 1mW or 1x10-3 watts.
R is the load impedance, and is typically 50 Ohms for RF systems.
To Calculate dBm from voltageenter the value in V(voltage) and hit P(dBm) button.
To Calculate voltage from dBm enter the value in P(dBms) and hit V(voltage) button.