What units can I use for the initial and output signal levels?

The calculator accepts generic linear units such as volts (V), millivolts (mV), watts (W), and milliwatts (mW), with the unit selected based on the chosen signal basis.

How does the calculator decide whether to use 10·log10 or 20·log10?

The tool uses a power ratio (10·log10) when the signal basis is set to power units like watts, and an amplitude or voltage ratio (20·log10) when the basis is set to amplitude units like volts or millivolts.

Can I calculate distance if I know the desired attenuation and coefficient?

Yes, the tool includes a propagation distance field; entering the attenuation coefficient and a known or target output level allows the calculator to determine the maximum distance for the signal to reach the target level.

What if I only want to find the attenuation in decibels without calculating distance?

You can solve for attenuation in decibels by providing the initial signal level, output level, and coefficient; the distance field is optional and can be left blank if only the dB value is needed.

PhysicsTool Review

Attenuation Calculator

Provided byCalculator Academycalculator.academy

This attenuation calculator lets you enter input and output voltage to compute decibel attenuation. It also provides ...

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About this tool

What Attenuation Calculator does

The Attenuation Calculator on Calculator Academy determines voltage attenuation in decibels by comparing an initial signal level to a known or target output level. Users enter the initial signal level, the output level, and an attenuation coefficient with its distance unit to compute the remaining signal strength, total attenuation in dB, or maximum propagation distance. The tool supports both power and amplitude calculations, using 10·log10 for power ratios and 20·log10 for voltage or amplitude ratios, and accepts a range of linear units including volts, millivolts, watts, and milliwatts.

Step by step

How to use the Calculator Academy Attenuation Calculator

1
Enter the initial signal level and the known or target output level
2
Select the compatible signal unit (V, mV, mW, etc.) and the attenuation coefficient
3
Choose the coefficient unit (dB/km, dB/m, dB/mile, etc.) and the propagation distance unit
4
Click Calculate to view the attenuation in decibels, remaining output level, or maximum propagation distance

Is it right for you

Best for

Engineers, students, and technicians who need a quick, unit-flexible way to calculate voltage or power attenuation and propagation distance across electrical components or transmission media.

Limitations

Results depend on the accuracy of the entered attenuation coefficient
Coefficient units are limited to dB per distance metrics (km, m, mile)
No support for frequency-dependent or complex impedance calculations

Questions

Attenuation Calculator FAQ

What units can I use for the initial and output signal levels?: The calculator accepts generic linear units such as volts (V), millivolts (mV), watts (W), and milliwatts (mW), with the unit selected based on the chosen signal basis.
How does the calculator decide whether to use 10·log10 or 20·log10?: The tool uses a power ratio (10·log10) when the signal basis is set to power units like watts, and an amplitude or voltage ratio (20·log10) when the basis is set to amplitude units like volts or millivolts.
Can I calculate distance if I know the desired attenuation and coefficient?: Yes, the tool includes a propagation distance field; entering the attenuation coefficient and a known or target output level allows the calculator to determine the maximum distance for the signal to reach the target level.
What if I only want to find the attenuation in decibels without calculating distance?: You can solve for attenuation in decibels by providing the initial signal level, output level, and coefficient; the distance field is optional and can be left blank if only the dB value is needed.

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