QuietudeHow quiet should a room be for studying?
By Ilia Usatov · November 2026 · 5 min read
Short answer: about 35 decibels of background noise, roughly the hum of a quiet room with the door closed. That is the level standards for classrooms aim for. But the number matters less than what kind of noise it is. Background speech and songs with lyrics get in the way far more than a steady hum.
The number: around 35 dB
Rooms built for learning have a target. The World Health Organization’s Guidelines for Community Noise set 35 dB LAeq as the limit for background noise in classrooms during lessons, so that speech stays clear and students can take in what they hear. The American classroom acoustics standard, ANSI/ASA S12.60, uses the same 35 dBA for a typical empty classroom, averaged over an hour.
For a sense of scale, here are the CDC’s reference points:
| Sound | About |
|---|---|
| Whisper | 30 dB |
| Classroom target | 35 dB |
| Normal conversation | 60 dB |
| Motorcycle engine | 95 dB |
Decibels are logarithmic, so small numbers hide big changes. NIOSH notes that every 3 dB more means twice the sound intensity. A room at 45 dB has ten times the sound intensity of one at 35 dB.
A home study space doesn’t have to hit 35 dB exactly. Fridges, ventilation and traffic all add a little, and that is fine. Use the number as a guide: if your room sits well above it while nobody is talking, look for the source.
Why speech is the worst kind of noise
Psychologists have studied the “irrelevant speech effect” for decades. People are asked to remember a list of items while speech they are told to ignore plays in the background. Their recall gets worse than in silence, even when the speech is quiet.
What does the damage is change. A stream of different words or syllables disrupts memory, while the same sound repeated over and over does much less. That is why a colleague’s phone call is harder to ignore than an air conditioner, even at the same volume. One recent study found that background speech hurt children’s and adults’ memory for words, but not for spatial positions. So reading, writing and memorising are likely to suffer most.
What about music?
It depends on the lyrics. In a 2014 study by Perham and Currie, students did a reading comprehension test in silence, with instrumental music, or with songs with lyrics. Lyrics lowered scores compared with silence and with music without words, whether or not the students liked the songs. The students also rated silence as the least distracting.
Later experiments by Vasilev and colleagues point the same way. Songs with lyrics made people read more slowly, while instrumental music had no effect or sped them up slightly. If music helps you start, pick something without words.
It depends on the noise and the task
A large meta-analysis by Szalma and Hancock pooled 242 studies on noise and performance. The size of the effect depended mostly on three things: whether the noise was continuous or intermittent, what kind of noise it was, and what kind of task people were doing. There is no single decibel line where focus breaks. A sudden door slam and a steady fan at the same level are not the same experience.
How to make a room quieter for studying
- Get away from speech first. Shut the door, pick the room furthest from the TV, or study when the house is asleep. This beats any gadget.
- Swap lyrics for instrumental music, or for nothing, during reading and writing.
- Find the steady sources. A fridge, a fan or a loud laptop raise the floor of the room. Moving away from them is often enough.
- Try earplugs or noise-cancelling headphones when you can’t control the room, like in a shared flat or a library.
- Measure instead of guessing. We get used to noise and stop noticing it, so a meter tells you more than your ears do after an hour.
A note on phone meters. An iPhone microphone is not a calibrated sound level meter. Readings from any phone app, including Quietude, are approximate. They are good for comparing rooms and times of day, not for official measurements.
Make quiet visible
Quietude is a silence timer for iPhone. Kivi, a little roly-poly in the snow, sleeps while the room stays quiet, and the meter shows how loud it is right now. In Strict mode a loud spike resets the timer. Nothing is recorded.
Get Quietude on the App Store →Sources
- World Health Organization. Guidelines for Community Noise. Geneva, 1999. Table of guideline values for schools and pre-schools.
- Acoustical Society of America. ANSI/ASA S12.60, Acoustical Performance Criteria, Design Requirements, and Guidelines for Schools. ASA overview.
- Centers for Disease Control and Prevention. Loud Noises Damage Hearing.
- NIOSH. Understand Noise Exposure.
- Irrelevant speech impairs serial recall of verbal but not spatial items in children and adults. PubMed Central, PMC9950248.
- Perham N, Currie H. Does listening to preferred music improve reading comprehension performance? Applied Cognitive Psychology 2014;28(2):279–284.
- Vasilev MR, et al. Experiments on background music with and without lyrics during reading. Journal of Cognitive Psychology, 2023. doi:10.1080/20445911.2023.2209346.
- Szalma JL, Hancock PA. Noise effects on human performance: a meta-analytic synthesis. Psychological Bulletin 2011;137(4):682–707. doi:10.1037/a0023987.