HowLoudHow Loud Is 55 Decibels?
55 dB is moderate. It is about as loud as an electric toothbrush, a coffee maker brewing, or a typical office with people working. It is a comfortable daytime level, slightly below a normal conversation.
What sounds are 55 decibels?
- An electric toothbrush
- A coffee maker brewing
- A window air-conditioning unit heard indoors
- An open-plan office with people typing and talking softly
- A car passing at 30 km/h heard from the pavement
55 dB(A) is the daytime outdoor level the WHO associates with the start of serious annoyance from community noise, and many city regulations use it for residential zones. Indoors it is the sound of a lived-in home.
Is 55 dB loud?
Not for hearing. 55 dB is still below normal speech and cannot cause hearing damage. It is loud enough that people notice it as a background and may find it annoying outdoors, especially at night when the surroundings are quieter.
| Zone | Safe (below 60 dB) |
|---|---|
| Safe daily exposure | no limit for hearing safety (below the 85 dB threshold) |
| Compared with 60 dB (normal talk) | 5 dB quieter — sounds roughly 1.4× as quiet, 3× the sound energy |
| Compared with 85 dB (damage threshold) | 30 dB quieter — sounds roughly 8× as quiet, 1,000× the sound energy |
Measure it yourself
Open the free online decibel meter on your phone or laptop and hold it where you want to measure. Readings from a built-in microphone are estimates within a few dB; for a legal noise complaint use a calibrated sound level meter.
Frequently asked questions
Is 55 dB too loud for a bedroom at night?
Indoors, yes for many people. Steady 55 dB inside a bedroom is above the WHO night-noise recommendation of 30 dB and will disturb light sleepers.
Is 55 dB loud for a fan or air conditioner?
It is on the louder side for a bedroom fan (quiet fans are 35–45 dB) but normal for a window air conditioner or a portable unit on a medium setting.
How does 55 dB compare with 65 dB?
65 dB is 10 dB louder: about twice as loud to the ear and ten times the sound energy. 65 dB is a lively conversation or a busy restaurant.