HowLoudCan Sound Kill You? How Many Decibels Are Lethal
Ordinary sound cannot kill you, but extreme pressure waves can. Eardrums can rupture from about 150–160 dB, and blast pressures in the range of roughly 185–200 dB can injure the lungs and cause fatal air embolism. Such levels only occur next to explosions, so in everyday life the real danger of loud sound is permanent hearing loss, which starts at a far lower 85 dB.
What sound does to the body, level by level
| Level | Effect | Example |
|---|---|---|
| 85 dB | Hearing damage after 8 hours a day | Heavy traffic, lawn mower |
| 100 dB | Hearing damage after about 15 minutes | Nightclub |
| 120 dB | Pain; damage within seconds | Thunder overhead, siren nearby |
| 140 dB | Immediate, permanent damage from a single impulse | Gunshot at the shooter's ear |
| 150–160 dB | Eardrum rupture likely | Explosions at close range |
| ≈170 dB | Disorientation, nausea, chest vibration | Stun grenade at 1.5 m |
| 185–200 dB | Lung injury, air embolism, potentially fatal | Blast wave near a large explosion |
Thresholds for injury vary with how long the pressure lasts and its frequency; short impulses are tolerated at higher peaks than sustained sound. Figures are approximate.
How a sound can be lethal
At everyday levels a sound wave is a tiny ripple in air pressure. As the level rises, the ripple becomes a punch. The ear goes first because the eardrum is a thin membrane designed to move with very small pressures. The lungs come next: they are full of air, and a strong pressure wave tears the delicate tissue between air sacs and blood vessels, letting air bubbles into the bloodstream. This is the same mechanism as blast injury, and it is why the figures above are really about explosions. Above about 194 dB in air the disturbance is no longer a sound wave at all but a shock wave, see the loudest sound ever recorded.
What about "sonic weapons"?
Long-range acoustic devices used by ships and police can produce around 150 dB at one metre to hail or deter people. Close up they can damage hearing and cause pain, but they are not lethal at the distances they are used. Low-frequency infrasound below 20 Hz is often claimed to cause fear, nausea or worse; at very high levels it can be unpleasant, but there is no reliable evidence of lethal infrasound weapons.
The real risk: hearing loss
Nothing in normal life approaches lethal levels, but plenty exceeds the hearing-damage threshold: concerts, power tools, motorbikes, fireworks, even headphones at full volume. Noise-induced hearing loss is permanent and painless while it happens. The safe decibel levels guide lists how long you can stay at each level, and the online decibel meter shows where you are right now.
Frequently asked questions
How many decibels can kill you?
Estimates put lethal blast pressure somewhere around 185–200 dB, depending on duration. That only happens close to large explosions.
How many decibels can burst your eardrum?
Roughly 150–160 dB, especially from a sudden impulse such as an explosion or a gunshot very close to the ear.
Can a loud concert kill you?
No. Concerts reach 100–120 dB, which can permanently damage hearing within minutes but is far below any level that harms other organs.
Can sound make you sick?
Very loud or very low-frequency sound can cause headaches, nausea and dizziness, and long-term noise exposure is linked with stress, poor sleep and raised blood pressure.