Sound Pressure Level


Sound pressure or acoustic pressure is the local pressure deviation from the ambient (average, or equilibrium) atmospheric pressure, caused by a sound wave.
Sound pressure level or sound level is a logarithmic measure of the rms sound pressure of a sound relative to a reference value.
When referring to measurements of power or intensity, a ratio can be expressed in decibels by evaluating ten times the base-10 logarithm of the ratio of the measured quantity to the reference level. Here we can calculate Sound Pressure Level, Sound and Reference Pressure.
Thus, the ratio of a power value P to another power value P0 is represented by LdB, that ratio expressed in decibels.

Related formulas


SPLSound Pressure Level (in dB) (dimensionless)
PRMSThe root mean square Sound Pressure (Pa)
P0Reference Pressure (Pa)