# Beta version#

BETA TEST VERSION OF THIS ITEM

This online calculator is currently under heavy development. It may or it may NOT work correctly.

You CAN try to use it. You CAN even get the proper results.

However, please VERIFY all results on your own, as the level of completion of this item is NOT CONFIRMED.

Feel free to send any ideas and comments !

This online calculator is currently under heavy development. It may or it may NOT work correctly.

You CAN try to use it. You CAN even get the proper results.

However, please VERIFY all results on your own, as the level of completion of this item is NOT CONFIRMED.

Feel free to send any ideas and comments !

# Calculation data: measured sound level and the distance#

Measured data (what we know) | ||

Measured sound pressure level | ||

Distance to source, where we measured sound level | ||

Prediction (what we want to know) | ||

The distance, where we want to predict sound level |

# Results - sound pressure level at given distance#

Prediction (what we want to know) | ||

Sound level predicted at second distance | 80 |

# Some facts#

- If we know the
**sound level**measured at a certain distance from the source, then we can**estimate**sound level, that we**would observe at a different distance**:

$A(r) = A(r0) - 20 ~ log\left(\frac{r}{r_0}\right)$where:

**$A(r)$**- sound level that would be observed at the distance $r$ from the source,

**$A(r_0)$**- known sound level measured at the distance $r_0$ from the source,

**$r$**- distance from the source at which we want to estimate the sound level $A(r)$,

**$r_0$**- distance from the source at which the reference intensity was measured $A (r_0)$ ,

**$log$**- base 10 logarithm.

# See also#

If you're interested in calculators related to acoustics, check out our other calculators:

- Sound intensity level (dB) - if you want to learn what is
**decibel**and how the**sound intensity level**is measured, - Sound velocity in materials - if you want to learn how the
**type of substance**affects**the speed of acoustic wave propagation**, - Acoustic impedance of substances - if you want to learn what is
**acoustic impedance**and how it depends on the**type of substance**, - Sound wave reflection - if you want to find out how an
**acoustic wave**behaves when it encounters an obstacle in the form of**media boundary**, - Mass law: single wall - if you're interested in building acoustics and would like to estimate the acoustic
**insulation of a single wall**, - Mass law: double wall - if you're interested in building acoustics and would like to estimate the acoustic
**insulation of a double wall**with an**air gap**between the walls, - Sound absorption coefficients - if you're interested in
**acoustic adaptation**of room and you would like to learn how different**materials absorb the acoustic wave**, - Noise propagation - if you want to learn how
**sound intensity level**changes with**distance from the source**, - Sound insulation countours - if you want to learn more about
**acoustic insulation assessment standards**used over the world, - Sound reduction index (SRI) - if you're searching for
**acoustic insulation**of popular**building materials**expressed in the coefficient**Rw**, - Sound transmission class (STC) - if you're searching for
**acoustic insulation**of popular**building materials**expressed by the index**STC**.

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