Noise Level Calculator
Add multiple dB sources, calculate distance attenuation, and check OSHA permissible exposure limits.
Decibel Addition
Enter dB levels of individual noise sources (comma-separated or one per line).
Combined Level
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Source Count
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Loudest Source
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Distance Attenuation
Level at Target
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Reduction
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OSHA Permissible Exposure Limits
OSHA Max Duration
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Noise Dose
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Status
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| dBA | 85 | 90 | 95 | 100 | 105 | 110 | 115 |
|---|---|---|---|---|---|---|---|
| OSHA Max (hrs) | 16 | 8 | 4 | 2 | 1 | 0.5 | 0.25 |
How this was calculated
dB addition: L_total = 10 × log10(Σ 10^(Li/10)). Decibels are logarithmic, so you cannot simply add them.
Distance attenuation: L2 = L1 - 20 × log10(d2/d1) for point sources in free field (inverse square law).
OSHA PEL: Max duration T = 8 / 2^((L-90)/5) hours. Dose = actual hours / max hours × 100%.
Need help with noise impact assessments, facility design, or HSE compliance?
Book a free strategy call →Noise Management in Industrial Operations
Industrial noise is a significant occupational hazard in oil and gas operations. Compressor stations, drilling rigs, pumping units, and gas processing facilities all generate high noise levels. OSHA 29 CFR 1910.95 limits noise exposure to 90 dBA for 8 hours (TWA), with a 5 dB exchange rate: every 5 dB increase halves the permissible exposure time. This calculator helps engineers and HSE professionals assess combined noise from multiple sources, predict noise levels at worker locations, and verify OSHA compliance. Built by Groundwork Analytics.