How to Use the Noise Hearing Risk Calculator
Enter noise level in decibels (dB) and daily exposure duration. The calculator returns the risk level, OSHA permissible exposure limit, NIOSH recommended limit, and your current dose as a percentage of the OSHA limit.
OSHA and NIOSH Standards
OSHA's Permissible Exposure Limit (PEL) is 90 dB for 8 hours, with a 5 dB exchange rate (every 5 dB increase halves the allowable time). NIOSH's Recommended Exposure Limit (REL) is more protective at 85 dB for 8 hours using a 3 dB exchange rate, which aligns with international WHO guidelines.
Common Noise Levels for Reference
Conversation: 60 dB, city traffic: 80 dB, motorcycle: 95 dB, concert or club: 110 dB, jet takeoff: 130 dB, gunshot: 140+ dB. Earphones at max volume typically reach 100–110 dB directly at the eardrum, making volume control essential.
Hearing Protection Options
Foam earplugs reduce noise by 25–33 dB NRR (Noise Reduction Rating). Earmuffs provide 25–35 dB reduction. Double protection (earplugs + earmuffs) adds an extra 5 dB of reduction. Wear protection any time you cannot speak comfortably at arm's length.
Frequently Asked Questions
Use a smartphone app like NIOSH Sound Level Meter (iOS) or Decibel X. For workplace compliance, use a calibrated sound level meter at ear height facing the noise source. Results from phone apps are approximate but useful for personal awareness.
Put on hearing protection immediately and reduce exposure time. For workplaces, engineering controls (sound barriers, isolating machinery) should be the first solution, before relying on PPE alone.