Every 3 dB increase doubles the sound energy, so safe exposure time halves. Concerts and clubs often exceed 100 dB, where damage can begin in under 15 minutes. Noise-induced hearing loss is permanent but preventable.
How to use the Noise Exposure Calculator
- Sound level
- Exposure time
Results update as you type, and every field accepts the units shown in its menu.
How it works
Enter the sound level in decibels (A-weighted) and how long you are exposed.
Inputs explained
| Field | What to enter |
|---|---|
| Sound level | In dBA |
| Exposure time | Units: h, min, days |
What each result means
- Safe time (NIOSH) = 8÷2^(([Sound level] – 85)÷3)
- Permissible time (OSHA) = 8÷2^(([Sound level] – 90)÷5)
- Your noise dose (NIOSH) = [Exposure time]÷[Safe time (NIOSH)]×100
Health note: this calculator is for education and screening only and is not a diagnosis or treatment advice. Discuss your results with a qualified clinician.
Formula
NIOSH: safe time (h) = 8 ÷ 2^((L − 85) ÷ 3)
OSHA: permissible time (h) = 8 ÷ 2^((L − 90) ÷ 5)
Daily dose (%) = exposure time ÷ safe time × 100
Worked example
Inputs — Sound level: 94 dBA; Exposure time: 2 h.
Results — Safe time (NIOSH) = 1 h 0 min; Permissible time (OSHA) = 4 h 36 min; Your noise dose (NIOSH) = 200 %.
Key terms
- dBA
- A-weighted decibels, adjusted to human hearing.
Frequently asked questions
How loud is too loud?
Above 85 dB for 8 hours; at 100 dB, safe time is about 15 minutes.
How loud are everyday sounds?
Conversation about 60 dB, heavy traffic 85 dB, concerts 100–110 dB.
Do earplugs help?
Yes – foam earplugs reduce noise by about 15–30 dB when fitted properly.