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Adding Sounds on the Decibel Scale

This calculator is used to find the total level of two sound sources added togther. When adding two sound levels that are expressed in decibels, it is not a matter of simply adding the dB levels. The sound from two speakers blasting out 90db each does not produce a 180db output, for example.

This calculator converts the source levels to the proper log values, sums them and then converts the result back to decibels.

Enter the dB value for each source and hit the Calculate button.

Source 1 (dB)

Source 2 (dB)

Output Decibels

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