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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 workbench
Circuit workbench

Keep RMS, peak and DC values distinct.

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Enter circuit values

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Your 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.

Input reference and sample values

Use the units and choices shown for each field. Sample values are provided for practice, not as recommendations.

InputFormat and unitsSample
Output voltageNumeric value. Unit: V. Must be greater than zero.10
Input voltageNumeric value. Unit: V. Must be greater than zero.1

Result for these sample inputs

20 dB

Select Try the example in the form to load these values and calculate them again. This replaces the current form inputs. Compare the result with the method and worked explanation below.

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.

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