DECIBEL ADDITION SUBTRACTION CALCULATOR



Decibel Addition Subtraction Calculator for addition and subtraction operations of values in dB.

Decibel addition equation: $${ L }_{ A }+{ L }_{ B }={ L }_{ A }+\log _{ 10 }{ (1+{ 10 }^{ \frac { -({ L }_{ A }-{ L }_{ B }) }{ 10 } }) }$$ 

Decibel subtraction equation: $${ L }_{ A }-{ L }_{ B }={ L }_{ A }+\log _{ 10 }{ (1-{ 10 }^{ \frac { -({ L }_{ A }-{ L }_{ B }) }{ 10 } }) }$$.

Note: For addition and subtraction operation, LA ≥ LB condition shall be met.


Decibel Addition Subtraction Calculator:


Addition / Subtraction (LA(dB) ± LB(dB) = Result)
Operation  LA (dB) LB  (dB) Result
     

Note: Use dot "." as decimal separator.

Note: For addition and subtraction operation, LA ≥ LB condition shall be met.

Definitions:

Decibel (dB): Decibel is a unit used to express relative difference in power or intensity, usually between two acoustic or electric signals, equal to ten times the common logarithm of the ratio of the two levels.