How Loud Is Too Loud? Decibel Limits Explained
The short answer: 85 dBA. Long or repeated exposure at or above that level can damage hearing, and every few decibels above it cuts the safe time in half.
How loud everyday sounds are
These ranges come from the NIDCD, part of the US National Institutes of Health:
| Level | Sound |
|---|---|
| 60–70 dBA | Everyday talking |
| 74–104 dBA | Movie theaters |
| 80–110 dBA | Motorbikes and dirt bikes |
| 94–110 dBA | Headphones at maximum volume, sporting events, concerts |
| 110–129 dBA | Sirens |
| 140–160 dBA | Fireworks shows |
The 85 dB rule and how fast safe time drops
Decibels are logarithmic. A 3 dB rise means twice the sound energy, so it is not a small step. NIOSH, the US research institute for workplace safety, recommends a limit of 85 dBA averaged over an 8-hour day and says to halve the time for every 3 dBA above that. Applying that rule gives this table:
| Level | Time per day |
|---|---|
| 85 dBA | 8 hours |
| 88 dBA | 4 hours |
| 91 dBA | 2 hours |
| 94 dBA | 1 hour |
| 97 dBA | 30 minutes |
| 100 dBA | 15 minutes |
A concert at 100 dBA uses up a full day's allowance in about a quarter of an hour. That is why ear plugs at gigs are not overkill.
What OSHA allows at work
OSHA's legal limit for US workplaces is looser: 90 dBA for 8 hours, with a 5 dBA exchange rate. OSHA allows 8 hours at 90 dBA but only 2 hours at 100 dBA. Employers must run a hearing conservation program once workers reach 85 dBA as an 8-hour average. If you are checking your own job, the NIOSH numbers are the safer guide.
Headphones and music: the WHO weekly budget
WHO thinks about listening per week, not per day. Its guidance: you can safely listen at 80 dB for up to 40 hours a week. At 90 dB, about 4 hours a week is all you get. For children, WHO's advice is to keep devices below 60% of maximum volume and take breaks.
Check your own levels
You do not need to guess. Run the decibel meter for a minute where you spend the time, at about ear height, and read the average (Leq), not the live number. If the average sits at 85 or above for hours, cut the time, turn it down or wear protection.
Questions
- How many decibels is too loud?
- Long or repeated exposure at or above 85 dBA can cause hearing loss, according to the NIDCD. NIOSH sets its workplace limit at 85 dBA averaged over 8 hours and halves the safe time for every 3 dB above that.
- How long can I listen at 90 dB?
- Under the NIOSH rule, about 2.5 hours a day (85 dBA for 8 hours, halved every 3 dB). For headphones and music, WHO says 90 dB gives you about 4 hours a week of safe listening.
- Is 70 dB loud?
- It is the top of the everyday-talking range (60–70 dBA in NIDCD figures). It is not a hearing risk on its own, but it is loud enough to be annoying through a wall or at night.
- Why do OSHA and NIOSH give different limits?
- OSHA is the legal limit for US employers: 90 dBA over 8 hours with a 5 dB exchange rate, and hearing programs from 85 dBA. NIOSH is a research body; its recommended limit is stricter, 85 dBA with a 3 dB exchange rate.