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Decibel Level from Intensity Ratio Calculator

dB = 10 · log₁₀(I / I₀) — sound or signal level.

Converts an intensity ratio or pressure ratio to decibels: dB_power = 10·log₁₀(I₁/I₀); dB_amplitude = 20·log₁₀(A₁/A₀). Includes reference level for absolute SPL.

Daniel Oh By Daniel Oh
Published Last reviewed 1 min read

Inputs

dB

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

dB = 10·log₁₀(I/I₀)

In depth

Converts an intensity ratio or pressure ratio to decibels: dB_power = 10·log₁₀(I₁/I₀); dB_amplitude = 20·log₁₀(A₁/A₀). Includes reference level for absolute SPL.