dBm to V/m Calculator

Use this calculator to convert Power in dBm to E-field strength in volt-per-meter (V/m).

The signal at the output connector of a transmitter is expressed in Volt or dBm. The field intensity at any distance away from the transmitter is expressed in terms of V/m.


  • Output power in either dBm or Watt
  • Antenna gain (dBi) and
  • Distance from the transmitter (meters)

V/m to dBm


Field Strength (V/m) = √(30*Pwatt*10(GaindBi/10))/Distance