dBV to dBm Calculator

This tool converts from dBV/dBmV/dBuV/dBnV to dBm and Watt

Enter the dBV value and also the impedance. The default value is 50 ohm but it can be changed to any value.

dBm to dBV

Formula

dBm = dBV − 10*Log10(Z) + 30

Example Calculation