How loud is 47 decibels (dB)?
Decibels are not intuitive, because the scale is logarithmic. 47 dB is not simply “a bit more” than the level below it — the energy climbs far faster than the number suggests. This page translates 47 dB into sounds you already know, shows exactly where it falls on the scale, and tells you whether it is safe.
What does 47 dB sound like?
47 dB is the sound level of a calm indoor environment — quiet enough to sleep, read or concentrate. The WHO recommends keeping bedroom noise below about 30 dB for undisturbed sleep and living spaces below 40 dB, so 47 dB sits right around the comfort boundary rather than any danger threshold.
Perception matters as much as physics. The human ear is most sensitive between roughly 2,000 and 5,000 Hz, so 47 dB of high-frequency hiss can feel more intrusive than the same 47 dB of low-frequency rumble. That is why almost every figure on this site — including this one — is A-weighted (dBA): the measurement is filtered to match how human hearing actually responds.
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47 dB compared to nearby levels
| Level | Typical source | How it compares to 47 dB |
|---|---|---|
| 37 dB | A quiet library | −10 dB — about 2.0× quieter to the ear |
| 47 dB | Light rain (this page) | — |
| 57 dB | A mechanical keyboard | +10 dB — about 2.0× louder to the ear |
How much louder is 47 dB, exactly?
Two different ratios answer this, and mixing them up is the single most common decibel mistake. Sound energy multiplies by ten for every 10 dB, while perceived loudness roughly doubles for every 10 dB. Against the reference of a normal conversation (60 dB), 47 dB carries roughly 0.050× the acoustic energy but your ear reports it as only about 0.41× as loud. That gap between energy and sensation is exactly why loud noise damages hearing before it feels painful.
Is 47 dB safe? How long can you listen?
Safe for your ears is not the same as harmless overall. The WHO Environmental Noise Guidelines link sustained exposure in the 50–65 dB range to sleep disturbance, elevated stress hormones and cardiovascular effects. If this is your constant background, the reason to reduce it is comfort and sleep rather than hearing loss.
How 47 dB falls off with distance
Outdoors, away from reflecting surfaces, sound follows the inverse-square law: the level drops about 6 dB every time the distance doubles. If 47 dB is measured at 1 metre, this is what a meter would read further away:
| Distance | Level | Comparable to |
|---|---|---|
| 1 m | 47 dB | Light rain |
| 2 m | 41 dB | A refrigerator |
| 4 m | 35 dB | A quiet library |
| 8 m | 29 dB | A quiet bedroom at night |
| 16 m | 23 dB | Soft whispering at 2 m |
| 32 m | 17 dB | Rustling leaves in a light breeze |
| 64 m | 11 dB | Normal breathing |
Indoors the picture changes: walls and ceilings reflect energy back, so the level falls more slowly and flattens at the room’s reverberant level. This is why a 47 dB source in a small tiled room feels far worse than the same source in a carpeted, furnished space — and why moving a noisy appliance a metre away helps outdoors but barely helps in a bathroom. Our decibel calculator works out the exact figure for any distance.
Frequently asked questions
Is 47 dB loud?
What is 47 decibels equivalent to?
How long can you safely listen to 47 dB?
Is 47 dB harmful to hearing?
How much louder is 47 dB than a normal conversation?
Nearby decibel levels
- 45 dBlight rain
- 46 dBlight rain
- 48 dBmoderate rainfall
- 49 dBmoderate rainfall
- 52 dBmoderate rainfall
- 57 dBa mechanical keyboard
Related tools & guides
- Full decibel chart0–194 dB
- Safe exposure calculatorNIOSH & OSHA dose
- Online sound meterMeasure in your browser
- dBA vs dBWhy weighting matters
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