Decibel Calculator for Audio (voltage)

small calculatorIf you don’t like formulas then you definitely won’t like the formula for calculating voltage ratios expressed in decibels.

So, use the following calculators to get a handle on the decibels with different input and outlet levels – just fill out the white input fields, the calculated results are highlighted with the bold colour.

These calculators also show you the theoretical values for resistors to make your own inline audio attenuator, and a calculator to show you the actual dB attenuator with any two real world resistors.

Decibel calculator
Circuit for simple audio attenuator – the value of the resistors are calculated above

For a better understanding of what all this means, read the articles on Understanding Decibels  Part 1 and Part 2.

For those who need to know, the basic formulas used for these calculators are :

\Large{dB = 20 Log_{10}\left(\frac{output\, level}{input\, level}\right)}


\large{Attenuation\ Ratio=\frac{\left(Resistor\,1+Resistor\,2\right)}{Resistor\,1}}


Please Note: I'm away working in Melbourne (F1 Grand Prix) for a week or so, and wont be available to answer questions until around Easter. I am sorry for the inconvenience.



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