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Decibel Sound Pressure Level (SPL) Calculator

SPL (dB) = 20·log10(P/P0) — sound level from pressure.

Calculates sound pressure level (SPL) in decibels from sound pressure, and converts between dB, power ratio, and amplitude ratio.

Daniel Oh By Daniel Oh
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

SPL = 20×log10(p/p0); p0 = 20 μPa; Lp = 10×log10(W/W0)

In depth

Calculates sound pressure level (SPL) in decibels from sound pressure, and converts between dB, power ratio, and amplitude ratio.