Volt VRMS to dBm Calculator

Use this calculator to convert from Volt RMS to Power in dBm.

VRMS stands for root-mean-square voltage or V_RMS

The default impedance is 50 ohm. It can be changed to any value.

🔁 dBm to Vrms

Formula

P_dBm = 10*log10((V_RMS)² /Z) + 30

Example Calculation

For V_RMS = 1 Volt and impedance (Z) = 50 ohm, the power is 13 dBm.

If instead you would like to convert from V_peak-peak to dBm, use this calculator instead.

Try our other calculators:

• dBm to Watt
• dBm/Hz to dBm
• dBm to Volt