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Distance Attenuation Calculator
Sound level drop with distance using the inverse square law.
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โก Instant Results
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Level at new distance
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Sound level drop with distance using the inverse square law.
Distance Attenuation Estimator
Enter your numbers below for an instant estimate.
0
๐ก Tip: L2 = L1 – 20 log10(r2/r1).
How It Works
Key concepts behind this calculator
1
Enter Values
Fill in each field with your own numbers.
2
Calculate
Results update as you change the inputs.
3
Review
Read the breakdown and the explanation.
4
Adjust
Change values to compare scenarios.
Quick Reference Guide
Distance Quick Guide
Typical values for reference.
| L1 dB | r1 m | r2 m | L2 |
|---|---|---|---|
| 90 | 1 | 10 | 70.0 dB |
| 100 | 1 | 2 | 94.0 dB |
| 85 | 2 | 20 | 65.0 dB |
| 70 | 1 | 5 | 56.0 dB |
| Rule of Thumb | Check inputs | Use as a guide | Round sensibly |
Common Questions
Distance Attenuation Calculator FAQ
Answers to common questions about this calculator.
Intensity falls with the square of distance.
6 dB in free field.
Only roughly, rooms add reverberation.
No.