dB to V/m Calculator

dB or deciBel is used to express the ratio of two power values on a logarithmic scale.

V/m or Volt per meter is a unit of measurement used to quantify the strength or intensity of an electric field at a specific point in space.

dB is a ratio and it cannot be converted to V/m which is an absolute number.

💡 However a related quantity dBV/m can be converted to V/m

Note the suffix V/m. It’s important that this be included. The formula for this conversion is V/m = 10((dBV/m) / 20)

Use the calculator below to find V/m from dBV/m

Formula

dBV/m, dBmV/m, dBµV/m, dBnV/m can all be converted to V/m using the following:

  • V/m = 10(((dBnV/m) – 180) / 20)
  • V/m = 10(((dBµV/m) – 120) / 20)
  • V/m = 10(((dBmV/m) – 60) / 20)
  • V/m = 10((dBV/m) / 20)

Example Calculation

  • 10 dBV/m converts to 3.16 V/m
  • 10 dBµV/m converts to 3.16 * 10-6 V/m or 3.16 µV/m

Background

Volts per meter (V/m) is a unit of measurement used to quantify the strength or intensity of an electric field at a specific point in space. It represents the electric potential gradient or the rate at which the electric potential (voltage) changes over a given distance.

deciBel Volt-per-meter (dBV/m) too represents the strength or intensity of an electric field at a specific point in space. The difference is dBV/m uses a logarithmic scale, which makes it easier to represent and compare a wide range of field strengths.

Application

Where is dBV/m used?

The unit is used by the FCC to specify radiation limits from electronic equipment. As example is shown in the picture below

References

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