Sound Wave Equations Formulas Calculator

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Solving For Sound Pressure Level SPL

Inputs:

Conversions:

sound wave pressure (P)	=	0		=	0	newton/meter^2
reference or hearing threshold pressure (P_ref)	=	0		=	0	newton/meter^2

Solution:

sound pressure level (SPL)

HAS NOT BEEN CALCULATED

Other Units:

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Select an equation to solve for a different unknown

	sound pressure level
	sound pressure
	reference pressure
	sound intensity level
	sound intensity
	reference intensity
	intensity at a distance from point source
	distance from sound source
	power emitted
	wave frequency
	wave velocity
	wavelength
	noise pollution level NPL

Where

SPL	=	sound pressure level, decibels (db)
P	=	sound wave pressure, newtons/meter²
P_ref	=	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
P_AV	=	average power, watt
NPL	=	noise pollution level, decibel (db)

Notes:
- Usually, I₀ is set to 10^-12 watts
- Usually, P_ref 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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