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Decibel Calculator

The NoiseMeters decibel calculator can be used to carry out addition and subtraction of dB values between 0 and 200 dB.

noise calculators
  dB Calculator  
  (c) NoiseMeters Limited  

Decibel Addition and Subtraction

Sound levels are generally expressed in decibels, which are logarithmic and so cannot be manipulated without being converted back to a linear scale. You must first antilog each number, add or subtract and then log them again in the following way:

decibel addition

For example, adding three levels 94.0 + 96.0 + 98.0:

db addition example

Or use the calculator!


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