How loud is 30 decibels?
30 dB is a soft whisper or a very quiet bedroom at night. The World Health Organization recommends a night-time bedroom average of 30 dB(A) for undisturbed sleep. Sounds at this level are calming, and many people find the silence noticeable.
Quiet
Calm background, like a library or a quiet home.
Sounds around 30 dB
- Soft whisper30 dB
- Quiet bedroom at night30 dB
Is 30 dB safe?
Yes. 30 dB is well below the 85 dB threshold where hearing damage begins, so there is no exposure limit.
- NIOSH
- No limit
- OSHA
- No limit
Where you hear 30 dB
30 dB(A) is the classic benchmark for a restful bedroom. The WHO Guidelines for Community Noise set 30 dB LAeq as the indoor level for good sleep, and quiet countryside homes, hotel rooms with good windows and libraries at closing time are typical examples. Most people notice this level as a pleasant silence.
Practical tips at 30 dB
If your bedroom measures well above 30 dB at night, find the source first: run the meter for ten minutes, note the Leq and look at when peaks happen. Heavy curtains, sealing gaps around windows and doors, and moving the bed away from the street-facing wall usually help more than earplugs alone.
The physics of 30 dB
- Sound pressure
- 6.3 × 10⁻⁴ Pa
- Sound intensity
- 10⁻⁹ W/m²
- Energy vs. threshold of hearing
- 1,000×
How does 30 dB compare?
10 dB
30 dB sounds about 4× as loud as 10 dB, with 100× the sound energy.
20 dB
30 dB sounds about 2× as loud as 20 dB, with 10× the sound energy.
40 dB
30 dB sounds about 2× quieter than 40 dB.
50 dB
30 dB sounds about 4× quieter than 50 dB.
Measure 30 dB yourself
Open the free sound meter, press Start and see whether your environment is above or below 30 dB.
Frequently asked questions
Is 30 dB safe?
Yes. 30 dB is well below the 85 dB threshold where hearing damage begins, so there is no exposure limit.
Sounds around 30 dB
Soft whisper (30 dB), Quiet bedroom at night (30 dB)
How does 30 dB compare?
30 dB sounds about 4× as loud as 10 dB, with 100× the sound energy. 30 dB sounds about 2× as loud as 20 dB, with 10× the sound energy. 30 dB sounds about 2× quieter than 40 dB. 30 dB sounds about 4× quieter than 50 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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