Hearing Protection NRR Calculator

Effective noise reduction from protection type and fit.

Firearm noise level (dB)

Primary NRR rating

Secondary NRR rating

Suppressor reduction (dB)

Shots per session

Tab to move between fields

Noise at ear (dB)

152

Total reduction (dB)13

Primary effective NRR (dB)13

Margin to 140 dB limit-12

Session Leq (dB)114.2

Meets OSHA limit (1=yes)0

Risk LevelExtreme - hearing damage likely

How to Use This Calculator

Enter the Firearm Noise Level in dB (pistol ~160 dB, rifle ~165 dB, magnum ~170 dB).
Set the Primary NRR rating of your hearing protection.
Optionally add a Secondary NRR for dual-protection (plugs under muffs) and Suppressor Reduction in dB.
Enter Shots per Session for a session noise exposure estimate.
Review Noise at Ear (dB), Total Reduction, and whether the setup meets the OSHA 140 dB impulse limit.

Ad Placeholder