Sound Wave Equations Calculator

Science Physics Formulas

Solving for Noise Pollution Level NPL in db(A)
Noise Pollution Level NPL in db


dB(A) level exceeded 10 percent of time (L10)
dB(A) level exceeded 50 percent of time (L50)
dB(A) level exceeded 90 percent of time (L90)


dB(A) level exceeded 10 percent of time (L10)
= 0
= 0
dB(A) level exceeded 50 percent of time (L50)
= 0
= 0
dB(A) level exceeded 90 percent of time (L90)
= 0
= 0


noise pollution level NPL in dB(A)

Other Units:

Change Equation
Select to solve for a different unknown
sound pressure levelsound pressure level
sound pressuresound pressure
reference pressurereference pressure
sound intensity levelsound intensity level
sound intensitysound intensity
reference intensityreference intensity
intensity at a distance from point sourceintensity at a distance from point source
distance from sound sourcedistance from sound source
power emittedpower emitted
wave frequencywave frequency
wave velocitywave velocity
noise pollution level NPLnoise pollution level NPL
SPL=sound pressure level, decibels (db)
P=sound wave pressure, newtons/meter2
Pref=reference pressure or hearing threshold, newton/meter2
IL=intensity level, decibel (db)
I=sound intensity, watt
I0=reference intensity or least audible sound level, watts
PAV=average power, watt
NPL=noise pollution level, decibel (db)

- Usually, I0 is set to 10-12 watts
- Usually, Pref is set to 0.00002 newtons/meter2
References - Books:
1) P. Aarne Vesilind, J. Jeffrey Peirce and Ruth F. Weiner. 1994. Environmental Engineering. Butterworth Heinemann. 3rd ed.
2) Tipler, Paul A.. 1995. Physics For Scientists and Engineers. Worth Publishers. 3rd ed.
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