Acoustic Decay Calculator

This calculator is used to work out the amount of decay over a distance with various conditions .

Acoustics - Attenuation of sound during propagation outdoors -

Part 1:
Calculation of the absorption of sound by the atmosphere

Air pressure in Pa
(typically 101325)
Air temperature
in degrees Celcius
Relative humidity
in %
Sound frequency
in Hz

Enter data in each box above. Click below for result.

dB per km


1] JavaScript Browser such as Netscape v.2 or better required

2] No input form constraint checking - be careful to input correctly

3] Values calculated are from actual input frequencies - whereas the tables in ISO 9613 are preferred 1/3 octave frequencies

4] No guarantee of any kind whatsoever for this software

5] Reference should be made to the Standard for full details including accuracy ranges

This counter shows the number of hits since the 11th September 2001

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