Vpp to dBm Calculator

This tool converts Peak-to-Peak Voltage to Power in both dBm and Watt.


  • Vpeak-to-peak
  • Impedance

arrow dBm to Volt peak-to-peak


The formula to convert VPP to an equivalent power level in dBm is

PdBm = 10*Log10((1/Z)*(Vpp/(2√2))2)

As well, the peak voltage,

Vpp= 2*Vp

and the RMS voltage,

Vpp = (2√2)*VRMS


The output level of an RF signal generator is typically specified in dBm. This might be used to drive a circuit with input limits specified in terms of peak-to-peak voltage.

For instance, a clock reference circuit might state that the minimum level requirement is 1 Vpp. Use this tool to calculate the output power from the signal generator in dBm. Make sure you specify the input impedance which defaults to 50 ohm in the calculator above.

Related calculators

  • VRMS to Vpp
  • Vpp to VRMS
  • PdBm to Watt
  • Watt to PdBm