Compute the loudness of a point source at a certain distance, based upon a measurement at a different distance.

The calculator does not take into account the effect of the soil, barriers,
reflections, wind, and atmospheric effects.

By adding the loudnesses of multiple point sources you can model
more complex sources of sound. Adding the loudnesses of sound sources
can be done with this calculator. For instance three point sources on a line form an elementary sound model for a road.

See also this calculator dealing with traffic noise.

This example takes both the inverse square law for distance and
exponential damping of sound over large distances into account with a
rate of 10^{-0,0003 r},
where r is the distance to the source. The damping factor (0.0003)
increases with frequency so you can adjust it in your computations.