Hearing-protection calculator

Step 1

What is the noise exposure?

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Can't find your occupation? Use "Enter measured value" above if you have dosimetry data, or try broader search terms (e.g. "operator", "labourer").

Lex,8h or Leq (daily noise exposure)

Enter a number between 50 and 140.

Measurement weighting

+3 dB spectral correction will be applied in the CSA formula.

📏 BC note: Noise measurement is required where workers may be exposed above 82 dBA Lex (WorkSafeBC OHS Reg Part 7).

Step 2

What hearing protector is being used?

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Earplug

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Earmuff

🔇

Dual

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NRR (auto-filled from search, or enter manually)

NRR

CSA Z94.2: earplugs derated at 50%

Estimated protected level at ear

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dBA

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Minimum HPD class required

for this exposure

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Jurisdiction —

Noise exposure (Lex) —

Spectral correction —

HPD —

NRR —

Derating (CSA Z94.2) —

Protected level —

Regulatory limit —

Disclaimer: Results are screening estimates only and do not replace noise measurement or a formal noise assessment. In BC, measurement is required where a worker may be exposed above 82 dBA Lex. Actual protection depends on proper fit, device condition, and consistent use. Consult a qualified occupational hygienist or audiometric technician for compliance decisions.