Intensidade em dB com Distância
- Created by
- Renato Passos, Eng. de Software
- Reviewed by
- Renato Passos, Eng. de Software
Last updated: Apr 18, 2026
Formula
dB distância
About this calculator
The intensity in dB with distance calculator is a useful tool to calculate the variation of the sound intensity with distance. This is especially important in musical contexts, where the sound intensity can vary significantly as you move away from the source.
The formula used by this calculator is the following: dB distance = dB initial − 20·log(r₂/r₁), where dB initial is the initial sound intensity in decibels, r₁ is the initial distance in meters and r₂ is the final distance in meters.
This calculator is useful in cases like setting up sound systems at events or shows, where the sound intensity needs to be adjusted to meet the needs of listeners in different areas of the location.
It's worth noting that this calculator assumes that the sound source is a point source, i.e. that the sound intensity is the same in all directions.
Frequently asked questions
What is sound intensity in dB?
Sound intensity in dB is a measure of the acoustic power of a sound. It is expressed in decibels (dB) and is used to compare the intensity of different sounds.
Why does the sound intensity decrease with distance?
The sound intensity decreases with distance because the sound energy disperses in the environment, losing intensity as it moves away from the source.
When should I use this calculator?
You should use this calculator whenever you need to calculate the variation of the sound intensity with distance, such as in cases of setting up sound systems at events or shows.
What is a point source?
A point source is a sound source that emits sounds in all directions with the same intensity. This is different from a sound source that emits sounds in a specific direction.