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Electrical

Voltage Gain in Decibels Calculator

Express a positive voltage ratio in decibels.

Ideal component relationshipsUnits and assumptions explained below

Circuit parameters

Runs on your device

CIRCUIT RESULT

Your result

Let’s calculate.

Use the Calculate button to see your result.

Review the method below for assumptions and conventions.

How to use this tool

  1. Enter output voltage, input voltage.
  2. Select Calculate to view the result.
  3. Check the method and assumptions below before using the result.

The method, explained

Voltage gain = 20 log10(output/input).

A WORKED EXAMPLE

Using output voltage = 10 V, input voltage = 1 V, the result is 20 dB. Change these example inputs to match your task; use the method above to check each step.

What to keep in mind

Power interpretation requires the appropriate impedance relationship. Ideal-component calculation for study and estimation. It does not select safe wiring, protective devices or component ratings for an installation.

Common questions

Which inputs does this calculation need?

Express a positive voltage ratio in decibels. Enter output voltage in V, input voltage in V. The filled example is editable and is not a saved personal record.

How should I interpret the result?

Power interpretation requires the appropriate impedance relationship. Ideal-component calculation for study and estimation. It does not select safe wiring, protective devices or component ratings for an installation.

Methodology maintained by ClarityKit. How these tools are built and checked.