Sound Absorption Coefficient Calculator

Your details

Choose the quantity you want to find. Each mode reveals the relevant inputs.
The intensity of the sound wave hitting the surface.
W/m²
The intensity absorbed by the surface (Ii minus reflected intensity). Must be <= Ii.
W/m²
Absorption coefficient (α)Good Absorber
0.75

Fraction of incident sound energy absorbed (0 = full reflection, 1 = full absorption)

Reflection coefficient (ρ)0.25
Absorbed energy0.8%
0.75 α
Reflective<0.05Low0.05-0.2Moderate0.2-0.5Good0.5-0.8Excellent0.8+

This material absorbs 75.0% of incident sound energy.

  • Absorption coefficient: 0.7500 (good absorber)
  • Reflection coefficient: 0.2500 - 25.0% of energy is reflected back.
  • Alpha ranges from 0 (total reflection) to 1 (total absorption). Most real materials fall between 0.01 (concrete) and 0.95 (mineral wool).
  • Values are frequency-dependent: porous materials absorb high frequencies well but need thickness or air gaps to control bass.

Next stepWell-suited for room treatment. Combine with diffusion panels if you need energy scatter rather than pure attenuation.

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