# Hemispherical Sound Propagation Calculator

The sound pressure in a hemispherical distance from a source with a known sound power can be calculated using the below Hemispherical Sound Propagation Calculator. When the sound source propagates hemispherically with the source near the ground, the constant can be set to K' = - 8. For a Hemisphere sound source on the ground, Q = 2. Just input the required values and the calculator will automatically update you with the sound pressure level at the hemispherical free field.

## Calculate Sound Pressure At Hemispherical Free Field

Pa
dB

The sound pressure in a hemispherical distance from a source with a known sound power can be calculated using the below Hemispherical Sound Propagation Calculator. When the sound source propagates hemispherically with the source near the ground, the constant can be set to K' = - 8. For a Hemisphere sound source on the ground, Q = 2. Just input the required values and the calculator will automatically update you with the sound pressure level at the hemispherical free field.

Code to add this calci to your website  #### Hemispherical Sound Propagation Formula:

Sound Pressure Level = 20 log (P / P0)dB Where, P = Sound Pressure P0 = Reference Sound Pressure= 2x10^-5 dB = decibel

#### Example

Calculate Sound Pressure At Hemispherical Free Field for an engine having P = 20 Pa?
= 20xlog(20/(2x10^-5))
The Equivalent pressure level of sound is 120 dB.