Distance Attenuation Calculator
Calculate ideal free-field level change between two distances from a point source.
A QUICK WALKTHROUGH
How to use this tool
- Enter matching measurements and period definitions.
- Review the formula assumptions and limits.
- Calculate locally in your browser.
Formula and limits
ΔL=20log10(r₁/r₂) dB. Assumes a point source in free field; no absorption, barriers, or reflections. This is not a safety, regulatory, acoustic compliance, or storage-system guarantee.
Privacy
Inputs are processed locally and are not uploaded.
GOOD TO KNOW
Common questions
Does this predict performance?
No. It applies the displayed formula to values you provide.