Loudness and time both matter
Sounds at or below 70 dBA are generally unlikely to damage hearing. Long or repeated exposure at 85 dBA or above can cause damage, and a very intense sound can injure hearing immediately. There is no single number that guarantees safety for every person and situation. [1]
If you need to raise your voice to speak to someone an arm’s length away, treat the setting as potentially hazardous. Reduce the noise, move away, shorten the exposure, and wear suitable protection. [3]
The time comparison below uses NIOSH’s workplace reference of 85 dBA over eight hours. It explains the relationship between level and duration. It is not a recreational listening recommendation or a promise that eight hours at 85 dBA is harmless. [4]
Everyday sound levels
These NIDCD ranges are examples, not measurements of your equipment or venue. Distance, room acoustics, equipment, and the way sound is measured change the result. Use an appropriate measurement at your listening position when possible. [2]
| Sound | Example level | Practical response |
|---|---|---|
| Conversation | 60–70 dBA | Generally low risk at these levels. |
| Lawnmower | 80–100 dBA | Use protection when mowing; choose quieter equipment where possible. |
| Motorcycle or dirt bike | 80–110 dBA | Plan suitable protection and keep communication and riding safety in mind. |
| Concert or sporting event | 94–110 dBA | Wear well-fitted protection, move away from loudspeakers, and take quiet breaks. |
| Headphones at maximum volume | 94–110 dBA | Lower the volume. A device’s volume percentage is not a dBA measurement. |
| Vacuum cleaner or power tool | Varies by model and task | Check a reliable measurement; the appliance name does not determine exposure time. |
| Firearms or fireworks | Impulse noise; fireworks can reach 140–160 dBA | A single event can cause injury. Do not use the time calculator for these sounds. |
For sustained noise, higher levels reach the same reference dose much sooner. For an impulse such as a gunshot, an average-level calculation can hide the hazard. Hearing protection and distance do not turn a hazardous impulse into a guaranteed safe exposure.
Noise exposure calculator
Explore how level and time work together. Enter a steady average sound level and a duration. This is an educational comparison with the NIOSH occupational reference, not a safe-time allowance or a measurement of your hearing.
30 minutes is 50% of that reference dose.
Reduce the level or time and use properly fitted hearing protection. A value below 100% does not guarantee safety.
Method: T = 480 × 2((85 − L) / 3) minutes; comparison dose = 100 × duration / T. Assumes one steady, unprotected exposure. It does not subtract earplug ratings, include your other exposures, assess children, or model impulse noise. Do not enter a peak reading as an average. The 85–110 dBA input range is a tool limit, not a safety boundary.
The calculator follows the NIOSH 3 dB exchange rate. Use the result to understand why reducing sound matters, not to decide how long to remain unprotected. [3] [4]
| Average level (dBA) | Calculated reference time |
|---|---|
| 85 | 8 hours |
| 88 | 4 hours |
| 90 | About 2 hours 31 minutes |
| 91 | 2 hours |
| 94 | 1 hour |
| 95 | About 48 minutes |
| 97 | 30 minutes |
| 100 | 15 minutes |
| 103 | 7 minutes 30 seconds |
| 106 | 3 minutes 45 seconds |
| 109 | About 1 minute 53 seconds |
What dB, dBA, and a phone reading mean
Decibels describe sound on a logarithmic scale. A-weighting, written dBA, adjusts the measurement to account for how different frequencies contribute to the reading. An increase of 3 dB represents about twice the sound energy, not twice the perceived loudness. An average over time and a brief peak answer different questions. [3]
A phone sound-meter app can help flag a loud environment. It cannot certify that an exposure is safe. Microphones, calibration, and measurement limits affect results, especially for very loud or impulsive sounds. Workplace assessments may require a sound-level meter or a personal dosimeter. [3]
A hearing test uses a different reference, dB HL. Do not compare an audiogram threshold directly with this environmental sound chart. See how to read an audiogram.
Choose the next useful action
Start with the source: turn it down, use quieter equipment, or move away. Add properly fitted earplugs or earmuffs when a loud environment cannot be avoided. Do not wait until sound becomes painful. [2]
For fit and product selection, read earplugs vs. earmuffs. For a practical routine, use the hearing-protection guide. Going to a show? Start with concert hearing protection.
All noisy activities contribute to exposure. A quiet break reduces additional exposure; it does not erase sound energy already received. Our 85, 90, 95 and 100 dBA guide shows how different activities can add together. [4]
When to involve a professional
Sudden hearing loss needs immediate medical attention. A rapid change in one or both ears, with or without ringing or dizziness, should not wait for a routine hearing test. Seek medical care immediately, even if you think noise or earwax caused it. [6]
Repeated ringing, muffled hearing, or trouble understanding speech deserves an audiologist’s evaluation. An ENT physician can assess medical causes and injuries. Symptoms alone cannot establish whether noise caused a hearing change. Read noise-induced hearing loss: symptoms and next steps. [1]
Sources and editorial information
Published by Hearing Is. Sources checked October 7, 2026. AI assistance was used in preparing this guide. No independent clinical review is claimed.
- NIDCD: Noise-Induced Hearing Loss
- NIDCD: Hearing Protectors
- NIOSH: Understand Noise Exposure
- NIOSH: Occupational vs. General Environmental Noise
- NIOSH: Provide Hearing Protection
- NIDCD: Sudden Deafness
Educational information, not an individual diagnosis, treatment plan, or occupational compliance assessment. Read our editorial standards and medical disclaimer.