How do I calculate attenuation if I only know the voltage ratio?

Enter the V2/V1 ratio directly into the voltage ratio mode; the calculator will apply the 20·log10 formula and return the decibel value without needing the original voltage magnitudes.

Can this tool convert dB back to a voltage ratio?

Yes, the calculator is bidirectional; entering a decibel value or a voltage ratio will produce the corresponding output, allowing you to reverse the calculation as needed.

Does the calculator handle both attenuation and gain?

The tool computes a positive or negative dB result depending on whether V2 is lower or higher than V1, so it works for both signal loss (attenuation) and signal boost (gain).

Is the result affected by impedance or power levels?

The calculator uses voltage ratio only; if you need power-based dB calculations, you would need to convert voltage to power first or use a power-specific dB tool.

PhysicsTool Review

Attenuation Calculator

Provided byUtilities Bunkerutilitiesbunker.com

Its dB calculator includes a voltage ratio mode that computes dB from V2/V1. The page lists the standard 20·log10(V2/...

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About this tool

What Attenuation Calculator does

The Attenuation Calculator on Utilities Bunker determines voltage signal loss in decibels by comparing input and output levels. Users enter two voltage values and the tool applies the standard 20·log10(V2/V1) formula to compute the dB change, displaying the resulting attenuation or gain. The site offers a voltage ratio mode that works from a direct V2/V1 ratio, making it adaptable for different measurement scenarios. The interface is straightforward, presenting only the necessary input fields and the computed result without unnecessary distractions. Compared to other online calculators, this version emphasizes the underlying physics formula and ratio logic, helping users understand how the decibel value relates to the voltage proportion they provide.

Step by step

How to use the Utilities Bunker Attenuation Calculator

1
Open the Attenuation Calculator on Utilities Bunker
2
Enter the initial voltage (V1) in the first field
3
Enter the final voltage (V2) in the second field
4
View the calculated decibel attenuation result displayed below the inputs
5
Use the voltage ratio mode if you have a V2/V1 proportion instead of absolute voltages

Is it right for you

Best for

Engineers, students, and hobbyists who need a quick, physics-based way to compute voltage attenuation or gain in decibels without manual logarithmic calculations.

Limitations

Results are based on ideal voltage ratios and may not account for real-world impedance matching
The tool requires known voltage values; it cannot generate attenuation data from circuit topology alone
No unit switching or conversion to other logarithmic units (e.g., nepers) is available

Questions

Attenuation Calculator FAQ

How do I calculate attenuation if I only know the voltage ratio?: Enter the V2/V1 ratio directly into the voltage ratio mode; the calculator will apply the 20·log10 formula and return the decibel value without needing the original voltage magnitudes.
Can this tool convert dB back to a voltage ratio?: Yes, the calculator is bidirectional; entering a decibel value or a voltage ratio will produce the corresponding output, allowing you to reverse the calculation as needed.
Does the calculator handle both attenuation and gain?: The tool computes a positive or negative dB result depending on whether V2 is lower or higher than V1, so it works for both signal loss (attenuation) and signal boost (gain).
Is the result affected by impedance or power levels?: The calculator uses voltage ratio only; if you need power-based dB calculations, you would need to convert voltage to power first or use a power-specific dB tool.

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