Noise Exposure Calculator
Calculate TWA noise dose and determine hearing protection requirements per OSHA standards.
Inputs
Results
TWA (dBA)
95
Noise Dose (%)
200
Allowable Exposure (hours)4
Protected Noise Level (dBA)86
Protected Dose (%)57.43
Action Level Exceeded (85 dBA)1
PEL Exceeded (90 dBA)1
How to Use This Calculator
- Enter noise levels (dBA) and duration (hours) for each noise source or area.
- Read the 8-hour time-weighted average (TWA) noise dose (%).
- A dose exceeding 100% or TWA above 90 dBA triggers OSHA Hearing Conservation Program requirements.
- Engineering controls must be implemented first; hearing protection is supplementary.
- Compare results against the OSHA action level (85 dBA TWA) and PEL (90 dBA TWA).
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