Noise Exposure Calculator

Estimate maximum noise exposure time and planned dose using NIOSH or OSHA exchange-rate rules.

1.1M uses Updated · 2026-05-25 Runs locally · zero upload
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How to Use the Noise Exposure Calculator

Enter the noise level in dBA, choose NIOSH or OSHA, and enter planned exposure hours. NIOSH uses 85 dBA with a 3 dB exchange rate; OSHA uses 90 dBA with a 5 dB exchange rate.

The calculator reports maximum exposure time and planned noise dose. A dose above 100% means the planned exposure exceeds the selected standard’s limit.

Formula and Method - Noise Exposure Calculator

Maximum exposure time (hours) = 8 × 2^((criterion level - measured dBA) ÷ exchange rate)

The exchange rate defines how quickly allowable time halves as noise rises. NIOSH is more conservative with a 3 dB exchange rate, while OSHA uses 5 dB in this model.

Use Cases for the Noise Exposure Calculator

  • Estimating safe stay time in industrial, construction, or event environments.
  • Comparing NIOSH and OSHA interpretations of the same noise level.
  • Teaching how small dB increases sharply reduce allowed exposure time.

Frequently asked questions about Noise Exposure Calculator

Is the input dB or dBA?

The calculator treats the input as dBA, the common A-weighted occupational noise measure.

Why is NIOSH stricter?

It uses a lower criterion level and a 3 dB exchange rate, reducing allowed time faster.

What if dose exceeds 100%?

Reduce time, lower noise, increase distance, or use appropriate hearing protection under safety rules.