Acoustic Decibels & Damping Calculator
Compute decibel change and distance attenuation of sound intensity.
Input Data
Intensity1Wm2
W/m²
Intensity2Wm2
W/m²
Distance1M
m
Distance2M
m
Results
Decibel Change Db
-10dB
Distance Attenuation Db
-6.0206dB
Pressure Ratio
0.316228
Intensity Ratio
0.1
At a glance:ΔL = 10·log10(I₂/I₁); distance attenuation follows the inverse-square law (20·log10(d₁/d₂)). Complements sound-intensity-level and sound-pressure-level.
Formula
ΔL = 10·log₁₀(I₂/I₁).
attenuation = 20·log₁₀(d₁/d₂).
$$\Delta\beta = 10\log_{10}\frac{I_2}{I_1}$$How to Use
- Enter two intensities and/or two distances.
- The tool returns the decibel change and ratios.
Case Studies
Doubling distance
Attenuation ≈ −6 dB (intensity quarter).
FAQ
Intensity vs pressure?
Sound level in dB uses intensity (10·log); pressure adds a factor of 20·log.
Related Tools
References
Content review: Calculatorism Science Team. Results are for reference only; please refer to the relevant authorities for the official figures.