Sound intensity level or acoustic intensity level is a logarithmic measure of the sound intensity in comparison to the reference level of 0 dB (decibels).

The measure of a ratio of two sound intensities is

where J₁ and J₀ are the intensities.

The sound intensity level is given the letter "L_J" and is measured in "dBW". dB is dimensionless.

If J₀ is the standard reference sound intensity, where

(W = watt), then instead of "dB" we use "dB SWL". (SWL = sound intensity level).

External link

• Conversion: Sound intensity level to sound intensity