Noise Exposure Calculator

8-hour TWA & Dose per OSHA 1910.95 + NIOSH REL

Formula (OSHA 29 CFR 1910.95 App. A): Dose D = 100 × Σ (Cₙ ÷ Tₙ) · TWA = 16.61 × log₁₀(D/100) + 90
Action Level = 85 dBA TWA (50% dose) · PEL = 90 dBA TWA (100% dose) · 5 dB exchange rate.

⚠ Important — Estimation Tool, Not Compliance Monitoring OSHA-compliant noise monitoring requires calibrated dosimetry across the full work shift (29 CFR 1910.95(d)). This calculator provides estimates for educational and planning purposes only based on user-entered noise levels. Use a calibrated, OSHA-compliant noise dosimeter for hearing conservation program enrollment, recordkeeping, or contesting findings. The author and FieldSafetyTalk.com assume no liability for decisions made using this tool.

1. Noise Exposure Periods

Please enter at least one valid noise period (level 80–140 dBA, time > 0).

OSHA 8-hour TWA

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Exposure breakdown

OSHA daily dose —

NIOSH equivalent (3 dB exchange) —

NIOSH dose —

Source: OSHA 29 CFR 1910.95 Appendix A; NIOSH Criteria for a Recommended Standard — Occupational Noise Exposure (Pub. 98-126).

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