Dbm to mv calculator – dbm to dbv & dbm to volts calculator

Dbm to mv calculator – dbm to dbv & dbm to volts calculator

Ω

This calculator converts a power value expressed in dBm (decibel-milliwatt) into dBmV (decibel-millivolt). This conversion is used to compare signal levels in RF systems and measurement equipment where voltage is a common reference, particularly in cable networks and video signal testing.

Formula

dBmV = dBm + 30 + 20 × log10(√Z0)

Explanation of the formula

The formula converts power (dBm) to voltage (dBmV) taking into account the system impedance (Z0). The +30 term converts milliwatts to millivolts and the logarithmic function adjusts the value according to the characteristic impedance. Typically, Z0 = 50 Ω or 75 Ω in RF and CATV applications.

Uses of the calculator

  • Fast conversion between dBm and dBmV for RF measurements.
  • Evaluation of signals in coaxial and cable systems.
  • Practical tool for telecommunications engineers and field technicians.
  • Used to calibrate instruments and check output levels of RF equipment.