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.

dB 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.

Supplements: