Noise Exposure & Hearing Damage Risk Calculator
Calculate your daily noise dose and cumulative hearing damage risk from headphones, concerts, or workplace noise using the equal energy principle.
Hearing Protection Guide
The Equal Energy Principle
Sound intensity doubles every 3 dB. Safe exposure time halves for every 3 dB increase (UK/EU standard — some countries use 5 dB per halving). UK Control of Noise at Work Regulations 2005: 80 dB(A): action level — employer must assess and provide hearing protection. 85 dB(A): upper action level — hearing protection must be used. Daily exposure limit: LEP,d of 87 dB(A). At 85 dB(A): safe for 8 hours. 88 dB(A): 4 hours. 91 dB(A): 2 hours. 94 dB(A): 1 hour. 97 dB(A): 30 minutes. 100 dB(A): 15 minute
Headphones and Personal Listening
The WHO estimates 1.1 billion young people are at risk of hearing loss from unsafe listening. Safe listening for headphones: 60% of maximum volume is approximately 80 dB on most devices. 80 dB is safe for 8 hours. Smartphones: iPhones and Android phones include volume warnings at 85-100 dB. After 7 days of average exposure above 80 dB (headphones), Apple Health sends a warning. Noise-cancelling headphones: allow lower volumes in noisy environments — more effective than turning up the volume to o
Noise-Induced Hearing Loss
Noise-induced hearing loss (NIHL): caused by damage to hair cells in the cochlea. These cells do NOT regenerate — hearing loss is permanent. NIHL typically first appears at high frequencies (4 kHz notch on audiogram). Early symptoms: difficulty understanding speech in noise. Tinnitus after noise exposure. Requiring louder TV or phone. Most people notice significant hearing loss only after 30-50% of hair cells are destroyed. Prevention is the only cure: hearing aids treat the disability but canno
Ear Protection
Earplugs: foam earplugs provide 25-35 dB attenuation. Single Noise Reduction (SNR) of 35 dB: if concert is 105 dB, protected exposure is 105-35 = 70 dB. Earmuffs: 25-35 dB attenuation. Comfortable for longer periods. High-fidelity ear protection: flat-response earplugs (Alpine, Etymotic) reduce all frequencies equally — music still sounds natural, just quieter. Musicians' earplugs: allow accurate hearing of music at safe volumes. Essential for professional musicians (often at 95-110 dB on stage)
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