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Decibel Calculator

dB
CCE Copy
%÷×
789+
456
123=
0.

Decibel calculator for performing arithmetic on sound levels

Use this tool to perform calculations with decibel sound levels. Decibels are logarithmic therefore the values are converted back to a linear scale before performing any functions like addition, subtraction, multiplication and division.

Use the calculator to see this in action with the full formula provided with the result.

Decibel add and subtract + −

This can be done by entering the decibel values and using the calculator as if you would a regular calculator

Decibel multiply and divide × ÷

Enter the decibel value first and then the factor to multiply or divide by second.

Calculate percentage of a decibel %

As with multiplication, enter the decibel value first and then enter the percentage value second.

Tips to use

  • The use of the keyboard numeric keypad is supported (ESC to clear).
  • Click entries under "Calculations" to reload the results
  • Copy your result to the clipboard with Copy