IEH Occupational Hygiene Tool
Noise Exposure Calculator
Estimate daily occupational noise exposure from task-based noise levels and exposure durations. This tool supports preliminary interpretation and control review.
Reference Noise Exposure Limit LAeq 8H
85.0
dB(A), 3 dBA doubling rate
Noise Exposure Calculator Tool
Enter task noise levels and durations. The calculator uses energy summation because decibels cannot be added arithmetically.
1. Assessment Details
2. Task Noise Levels and Durations
3. Field Notes
Estimated LEX,8h
85.0 dB(A)
Review exposure and controls
Equivalent level over entered duration
86.2 dB(A)
Total exposure duration
6.0 h
Dose reference to 85 dB(A), 8 h
100%
Highest entered task level
88.0 dB(A)
Interpretation
Recommendation: Enter task data and calculate the exposure result.
Calculation Method
The 8-hour equivalent exposure is estimated using:
LEX,8h = 10 × log10(Σ duration × 10^(level/10) ÷ 8)
This tool is for preliminary interpretation and knowledge-based review. It does not replace competent occupational hygiene assessment, calibrated instrumentation or formal noise monitoring reporting.
Continue with the occupational noise toolkit.
Use this calculator together with the survey planner, instrument checklist, personal dosimetry field diary and noise control tools.