About this calculator

This calculator converts between signal powers in dBm (decibel-milliwatts) or W and root mean square (RMS) and peak-to-peak voltages for a given impedance . Taking power in dBm as the starting point, power in linear scale (milliwatts) is

This can be converted to watts and finally to RMS voltage using

Assuming sinusoidal signal, the peak-to-peak voltage is then