Sound Masking Calculator

Calculate OSHA noise dose and time-weighted average (TWA) from multiple exposure periods. Determines compliance with OSHA PEL (90 dBA / 8 hr) using the 5 dB exchange rate.

Inputs

Period 1 level (dBA)

Period 1 duration (hrs)

Period 2 level (dBA)

Period 2 duration (hrs)

Period 3 level (dBA)

Period 3 duration (hrs)

Period 4 level (dBA)

Period 4 duration (hrs)

Tab to move between fields

Results

Noise dose (%)

100

TWA (dBA)90

Max allowable exposure (hrs)8

Remaining time at 90 dBA (hrs)0

Compliance (0/1/2)1

Total exposure (hrs)8

How to Use This Calculator

Enter Period 1 level (dBA), Period 1 duration (hrs), and Period 2 level (dBA).
Set Period 2 duration (hrs), Period 3 level (dBA), and Period 3 duration (hrs).
Adjust Period 4 level (dBA), Period 4 duration (hrs) as needed.
Review the Noise dose (%) result.
Use TWA (dBA) and Max allowable exposure (hrs) to inform your decision.

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