Enter the sound pressure and reference pressure into the calculator to determine the sound pressure level, also known as dB level.

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## Sound Pressure Level Formula

The following equation is used to calculate a sound pressure level.

dB = 10 * log ( p^2 / pr^2)

- Where dB is the sound pressure in decibels
- P is the sound pressure (pascals)
- pr is the reference pressure (pascals)

To calculate the sound pressure level, divide the sound pressure squared by the reference pressure squared, take the log of this result, then multiply by 10.

## Sound Pressure Level Definition

A sound pressure level is the pressure differential caused by the pressure of a sound wave and an ambient pressure.

## Sound Pressure Example

How to calculate a sound pressure?

**First, determine the sound pressure.**Measure the total pressure of the sound.

**Next, determine the reference pressure.**Most often this is just the atmospheric pressure.

**Finally, calculate the sound pressure level.**Calculate the decibels of the sound using the equation above.

## FAQ

**What is a sound pressure level?**

A sound pressure level is a pressure wave caused by a differential in pressure produces by sound waves.