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Sound Intensity Calculator

Sound intensity level in decibels from intensity or power, and how it falls with distance.

Enter values

Results update as you type.

Result

Sound level

90 dB

Intensity at new distance
0.0000625 W/m²
Level at new distance
77.96 dB
Change
-12.04 dB

About the Sound Intensity Calculator

Sound intensity level in decibels from intensity or power, and how it falls with distance.

Also known as: sound level, db from intensity, sound power to db, inverse square sound.

How to use this calculator

  1. Enter sound intensity, distance from source, new distance.
  2. The result updates instantly as you type — press Calculate (or Enter) at any time.
  3. Review the breakdown shown under the main result.
  4. Use Copy result or Share to save the answer or send a link with your inputs.

Formula

L = 10·log₁₀(I / 10⁻¹²) · I ∝ 1/r²

Worked example

Using the values pre-filled in the calculator above:

  • Sound intensity = 0.001 W/m²
  • Distance from source = 1 m
  • New distance = 4 m

the calculator returns:

  • Sound level: 90 dB
  • Intensity at new distance: 0.0000625 W/m²
  • Level at new distance: 77.96 dB
  • Change: -12.04 dB