Enter the sound level and distance at point 1, and the sound level at point 2 into the calculator to find the distance at point 2.

## Decibel Distance Formula

The following formula is used to calculate the decibel distance.

D2 = D1 / Sqrt (I2 / I1)

- Where D2 is the distance at point 2
- D1 is the distance at point 1
- I2 is the decibel level at point 2
- I1 is the decibel level at point 1

## Decibel Distance Definition

**What is decibel distance? **A decibel distance is a measure of distance that a certain decibel level is reached given an initial distance and sound level from the sound source.

## Example Problem

How to calculate decibel distance?

**First, determine the sound level at point 1.**The sound level at point 1 in this example is found to be 20 dB.

**Next, determine the distance from the source at point 1.**The distance from the sound source to point 1 is found to be 20 ft.

**Next, determine the sound level at point 2.**The sound level at point 2 is found to be 3 dB.

**Finally, calculate the distance to point 2 from the source.**The final distance is calculated to be 20 / Sqrt (3/20) = 51.639 ft.

## About Decibel Distance

**How does sound change with distance? **The sound level from a source changes with the square of the change in distance.