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Free-Field Sound Distance Estimate

New level = reference level−20 log₁₀(new distance/reference distance).

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Sound pressure distance calculator online

New level = reference level−20 log₁₀(new distance/reference distance). Use this to calculate a stated mathematical relationship from your own explicit assumptions. Units and input order are part of the calculation; no changing external rates or laws are inferred.

How to use it

Enter 3 comma-separated numbers in this order: level at reference distance dB, reference metres, new distance metres. Choose Calculate. Review the output, then copy or download it.

Calculation method

New level = reference level−20 log₁₀(new distance/reference distance).

Worked examples

Use this to calculate a stated mathematical relationship from your own explicit assumptions. Units and input order are part of the calculation; no changing external rates or laws are inferred.

Reproducible worked example

Settings: No additional settings.

Input:

80, 1, 4

With the input and settings above, the tool produces:

Output:

67.95880017344075

Limitations and common mistakes

  • Ideal point source in a free field. Reflections, atmospheric absorption and background noise are excluded.
  • Combined input is bounded to 150,000 characters; output text is bounded to 1.2 million characters. Some algorithms impose smaller limits, stated in their error messages.
  • Use a dot as the decimal separator and commas or spaces between numeric entries. The calculation uses floating-point arithmetic unless exact integers are explicitly stated.

Frequently asked questions

What format should I enter?

Enter 3 comma-separated numbers in this order: level at reference distance dB, reference metres, new distance metres. The worked example shows the supported structure and actual output.

How can I approximate free-field sound attenuation online?

Enter 3 comma-separated numbers in this order: level at reference distance dB, reference metres, new distance metres. Choose Calculate. Review the output, then copy or download it.

Where is my input processed?

The bundled tool processes input in your browser. It does not upload tool input to a conversion service. Other site plugins, analytics, advertising and browser extensions may have separate behavior.

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