How do I calculate attenuation between two voltages?

Enter the input voltage in Voltage A and the reduced output voltage in Voltage B, then press Calculate. The tool uses the formula 20·log10(Vout/Vin) to return the decibel attenuation.

Can this calculator handle gain as well as attenuation?

Yes. If the output voltage is higher than the input, the result will be a positive dB value representing gain; if lower, it will be negative, representing attenuation.

What is the difference between the db Power Ratio and db Voltage Ratio calculators?

The db Power Ratio calculator uses the formula 10·log10(Pout/Pin) for power values, while the db Voltage Ratio calculator uses 20·log10(Vout/Vin) for voltage values, reflecting the different logarithmic relationships between power and voltage.

Is the dbx Voltage Ratio calculator free to use?

Yes, the calculator is available on the dbx Professional Audio website at no cost.

PhysicsTool Review

Attenuation Calculator

Provided bydbx Professional Audiodbxpro.com

The db Voltage Ratio calculator computes the dB ratio between two voltages. The page notes it can be used to determin...

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About this tool

What Attenuation Calculator does

The dbx Voltage Ratio calculator determines the decibel difference between two voltage levels using the standard 20·log10(Vout/Vin) formula. It provides a quick measurement of signal strength reduction or gain, useful for preventing input overload or matching component levels. The site presents a clean, calculator-focused interface with clearly labeled input fields for Voltage A and Voltage B, and the result displays the dB value instantly. The page also links to related calculators for power ratios, amplifier power requirements, and the inverse square law, offering a broader set of sound-system tools within the same environment.

Step by step

How to use the dbx Professional Audio Attenuation Calculator

1
Open the dbx Voltage Ratio calculator on dbxpro.com
2
Enter the input voltage (Vin) in the Voltage A field
3
Enter the output voltage (Vout) in the Voltage B field
4
Click Calculate to see the decibel attenuation or gain result
5
Review the dB value to assess signal strength reduction

Is it right for you

Best for

Audio engineers and sound system designers who need to quickly calculate voltage attenuation or gain in decibels when matching levels or preventing input overload.

Limitations

Results are based on voltage ratios only, not power or impedance matching
No unit switching or additional measurement types beyond voltage dB
The tool focuses on ratio calculation and does not provide circuit design advice

Questions

Attenuation Calculator FAQ

How do I calculate attenuation between two voltages?: Enter the input voltage in Voltage A and the reduced output voltage in Voltage B, then press Calculate. The tool uses the formula 20·log10(Vout/Vin) to return the decibel attenuation.
Can this calculator handle gain as well as attenuation?: Yes. If the output voltage is higher than the input, the result will be a positive dB value representing gain; if lower, it will be negative, representing attenuation.
What is the difference between the db Power Ratio and db Voltage Ratio calculators?: The db Power Ratio calculator uses the formula 10·log10(Pout/Pin) for power values, while the db Voltage Ratio calculator uses 20·log10(Vout/Vin) for voltage values, reflecting the different logarithmic relationships between power and voltage.
Is the dbx Voltage Ratio calculator free to use?: Yes, the calculator is available on the dbx Professional Audio website at no cost.

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