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

To calculate distance from decibels, divide the distance at point 1 by the square root of the result of the decibels at point 2 over the decibels 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?

1. First, determine the sound level at point 1.

The sound level at point 1 in this example is found to be 20 dB.

2. 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.

3. Next, determine the sound level at point 2.

The sound level at point 2 is found to be 3 dB.

4. Finally, calculate the distance to point 2 from the source.

The final distance is calculated to be 20 / Sqrt (3/20) = 51.639 ft.