Sound Pressure
Calculator and formulas to calculate the sound pressure level in dB and pascal
This function calculates the sound pressure level in decibels or pascals.
For the calculation, use the radio button to select which parameter is to be calculated. Then enter the required values and click the 'Calculate' button.
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Sound pressure level formulas
The SI unit of sound pressure is Pascal (Pa). The reference value (L0) for sound in air is 20 µPa. This level is approximately the human hearing threshold at 1 kHz. Sound level meters display sound pressure in decibels (dB).
\(\displaystyle L_0=20\;µPa=0\;dB\)
Convert sound pressure level Pa to dB
\(\displaystyle L_P\;[dB]=20 · log_{10}\left(\frac{Pa}{L_0} \right)\)
Convert sound pressure level from dB to Pa
\(\displaystyle Pa=10^{\frac{Lp\;[dB]}{20}}·L_0\)
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