Free Tool · Hearing Protection Selection
Noise Exposure Calculator: Match Sound Levels to Hearing Protection
Select the noise level band closest to your workplace measurement to see the typical hearing protection response required. Use a calibrated sound level meter or dosimeter for an accurate reading rather than estimating by ear.
Low Noise Environment
Below the lower exposure action value, mandatory hearing protection is generally not required, though periodic monitoring is still good practice if levels are close to this threshold for long shifts.
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Lower Exposure Action Value Range
Hearing protection should be made available to workers on request at this level, even though it is not yet mandatory. Basic earmuffs or earplugs rated around SNR 20 are typically suitable.
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Upper Exposure Action Value Range
Hearing protection becomes mandatory at this level. Select a protector with enough attenuation to bring the effective exposure comfortably under 85 dB(A) at the ear, and enforce consistent wear.
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High Noise Exposure
Combine earplugs with earmuffs for double protection at this level. Check that the combined attenuation, not just each device individually, is sufficient for the measured level.
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Very High Noise Exposure
Double protection is mandatory and task duration should be actively limited. This range typically triggers a formal hearing conservation program including audiometric testing.
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Extreme Noise Exposure
Access and task duration should be severely restricted at this level. Use specialist high-attenuation protectors and treat the area as requiring engineering controls wherever possible rather than relying on PPE alone.
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Impulse or Impact Noise
Sudden impact noise from cartridge-operated tools or similar sources needs impulse-rated protectors, since average dB readings can understate the risk from short, sharp peaks.
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How to Use This Tool
Take a measurement with a calibrated sound level meter or dosimeter at ear height in the work area, then select the closest band above. Remember that noise levels can vary through a shift, so measure during the loudest representative task, not just at a quiet moment.
Why This Is a Guide, Not a Formal Noise Assessment
A proper noise risk assessment considers daily and weekly exposure duration, not just peak level, along with individual worker exposure across multiple tasks and locations. This tool gives a general protection response for a single measured level; a qualified person should complete the full exposure calculation for compliance purposes.
Frequently Asked Questions
What is SNR and why does it matter?
SNR (Single Number Rating) is a laboratory-derived figure showing how much a hearing protector reduces noise reaching the ear. Higher SNR means more attenuation, but over-protection can also cause workers to remove protection because they feel isolated, so matching SNR to the actual noise level matters.
Can earplugs and earmuffs be combined?
Yes, combining both is standard practice above roughly 100 dB(A). The combined attenuation is not simply additive, so check manufacturer guidance for the actual combined performance figure.
How often should hearing protection be replaced?
Foam earplugs are typically single or limited use and should be replaced when soiled or misshapen. Earmuffs should be checked regularly for cracked cushions, damaged headbands or reduced seal, and replaced per manufacturer intervals.
Does exposure duration change the protection needed?
Yes. A shorter, louder task and a longer, quieter task can carry similar overall risk. Formal noise exposure calculations combine level and duration across the full working day.
Are these levels specific to my country regulations?
The bands reference the exposure action values commonly used across the EU. Always confirm exact legal thresholds and hearing conservation program requirements with your local occupational safety regulator.
Explore the full EN Standards Library for every standard referenced above, or read real Field Stories showing what happens when selection goes wrong.