Use this calculator to convert from Volt RMS to Power in dBm.
RMS means root-mean-square value or VRMS
The default impedance is 50 ohm. It can be changed to any value.
PdBm = 10*log10((VRMS)2 /Z) + 30
For VRMS = 1 Volt and impedance (Z) = 50 ohm, the power is 13 dBm.
If instead you would like to convert from Vpeak-peak to dBm, use this calculator instead.
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