dBm to Vrms Calculator

This tool converts Power in dBm to Volt Root-mean-square or VRMS

The default impedance (Z) is 50 ohm, although you can change that to any value.

arrow Convert Volt RMS to dBm


VRMS = SQRT(Z/1000)*10(PdBm/20)

Example Calculation

1 dBm into a 50 ohm impedance translates to an RMS Voltage of 251 millivolt.

The same power into half the impedance value gives 177 mV.

Related Calculators