Enter the power level and resistance into the calculator to determine the voltage. This calculator can also evaluate any of the variables given the others are known.

Dbm To Volts Formula

The following formula is used to calculate the voltage from dBm.

V = sqrt((10^{(dBm/10)}) * 0.001 * R)


  • V is the voltage (Volts)
  • dBm is the power level (decibels-milliwatts)
  • R is the resistance (Ohms)

To calculate the voltage, first divide the power level by 10. Then, raise 10 to the power of the result. Multiply this by 0.001 and then by the resistance. Finally, take the square root of the result to get the voltage.

What is Dbm To Volts?

Dbm to Volts is a conversion process used in electrical engineering to change a measurement of power from decibels-milliwatts (dBm) to voltage (Volts). dBm is a unit of power that represents the ratio of a power level relative to a reference level of 1 milliwatt, expressed in decibels. The conversion is necessary because these two units measure different aspects of an electrical signal, and converting between them allows for more comprehensive analysis and understanding of the signal’s behavior.

How to Calculate Dbm To Volts?

The following steps outline how to calculate the Dbm To Volts using the given formula:

  1. First, determine the power level in decibels-milliwatts (dBm).
  2. Next, raise 10 to the power of (dBm/10).
  3. Multiply the result by 0.001.
  4. Multiply the previous result by the resistance in Ohms (R).
  5. Take the square root of the previous result.
  6. Finally, calculate the voltage in Volts (V).

Example Problem:

Use the following variables as an example problem to test your knowledge:

power level (dBm) = 20

resistance (Ohms) = 100