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Sound Intensity Level Decibel Calculator

L = 10 log₁₀(I/I₀); I₀ = 10⁻¹² W/m².

Converts between sound intensity (W/m²) and intensity level in decibels (dB). Reference intensity I₀ = 10⁻¹² W/m² (threshold of hearing).

Marcus Laurent By Marcus Laurent
Published Last reviewed 1 min read

Inputs

Results

Enter values and click Calculate to see results.
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How to use this calculator

  1. Fill in the inputs above using the units you already have.
  2. Values update automatically as you type — no submit button needed.
  3. Hover any result row for the underlying formula and intermediate values.

Formula

L (dB) = 10 × log₁₀(I / 10⁻¹²); I = 10⁻¹² × 10^(L/10)

In depth

Converts between sound intensity (W/m²) and intensity level in decibels (dB). Reference intensity I₀ = 10⁻¹² W/m² (threshold of hearing).