How loud is 155 dB?

How loud is 155 dB?

155 decibels is dangerous. 155 dB sounds about 724.1 times as loud as normal conversation (60 dB), and it carries 3.16e+09 times the sound energy. Typical sounds around this level: firecracker, fireworks, 9 mm handgun.

Decibels are logarithmic: every +10 dB means ten times more sound intensity but is heard as only about twice as loud, and every +6 dB doubles the sound pressure. That is why a few decibels can make a big difference.

Is 155 dB dangerous?

Yes, with enough exposure. NIOSH recommends no more than less than a second per day at 155 dBA (US law, via OSHA, allows 4 seconds). Hearing damage from noise is cumulative and permanent, so use earplugs or earmuffs, increase distance or reduce exposure time.

Impulse noise and the limits of sound

At 140 dB and above even a single exposure – a gunshot, an explosion, fireworks at close range – can cause immediate, permanent hearing damage. NIOSH sets 140 dB as the ceiling for unprotected impulse noise.

194 dB is the theoretical maximum for an undistorted sound wave in air at sea level: the pressure swings between zero (a vacuum) and twice atmospheric pressure. Beyond that, sound becomes a shock wave.