Sound Decibel (dB) Distance Attenuation Calculator (Inverse Square Law)

Calculate acoustic pressure decay over distance through free-field inverse square law ($-6$ dB per distance doubling).

Inputs used by this tool

Enter values in the interactive controls when the page loads. The result depends on the assumptions and units shown for each field.

Sound Level at Source ($L_1$, dB SPL)

Input type: number

Measurement Distance ($r_1$, meters)

Input type: number

Target Observer Distance ($r_2$, meters)

Input type: number

Data handling varies by tool. Review its notes and the Privacy Policy before entering sensitive information.