How loud is 120 decibels?
120 dB is the threshold of discomfort: a thunderclap overhead or an emergency siren passing by. Even brief exposure can damage the delicate hair cells of the inner ear, and it can be physically painful.
Painful
Immediate risk of permanent hearing damage.
Sounds around 120 dB
- Emergency siren (close)120 dB
- Thunderclap overhead120 dB
Is 120 dB safe?
No. At 120 dB, even very short exposure can cause pain and permanent hearing damage. Use hearing protection and increase distance.
- NIOSH
- 9 sec
- OSHA
- 8 min
Where you hear 120 dB
120 dB is the threshold of discomfort: an ambulance siren passing close by, a thunderclap directly overhead, a pneumatic chipping hammer or the front row of a very loud concert. Under the NIOSH exchange rate, the daily allowance at 120 dB is only about nine seconds.
Practical tips at 120 dB
Phone microphones and the browser audio chain can clip near 120 dB, so readings may under-report the true peak. Treat any reading at this level as a signal to protect your ears immediately: cover them, turn away and increase distance. Emergency workers and motorsport crews use high-attenuation earmuffs for exactly this reason.
The physics of 120 dB
- Sound pressure
- 20 Pa
- Sound intensity
- 1 W/m²
- Energy vs. threshold of hearing
- 10¹²×
How does 120 dB compare?
Measure 120 dB yourself
Open the free sound meter, press Start and see whether your environment is above or below 120 dB.
Frequently asked questions
Is 120 dB safe?
No. At 120 dB, even very short exposure can cause pain and permanent hearing damage. Use hearing protection and increase distance.
Sounds around 120 dB
Emergency siren (close) (120 dB), Thunderclap overhead (120 dB)
How does 120 dB compare?
120 dB sounds about 4× as loud as 100 dB, with 100× the sound energy. 120 dB sounds about 2× as loud as 110 dB, with 10× the sound energy. 120 dB sounds about 2× quieter than 130 dB. 120 dB sounds about 4× quieter than 140 dB.
Sources
Exposure limits follow the NIOSH REL (85 dB(A), 3 dB exchange rate) and the OSHA PEL (90 dB(A), 5 dB exchange rate). Example levels are typical values; real sources vary with distance and conditions.
- Noise and hearing loss basics (NIOSH recommended exposure limit), CDC / NIOSH
- 29 CFR 1910.95: Occupational noise exposure, US OSHA
- Environmental Noise Guidelines for the European Region (2018), World Health Organization
- Safe listening devices and systems: a WHO-ITU standard (H.870), World Health Organization
- Noise-Induced Hearing Loss, NIH / NIDCD
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