This sound meter turns your phone or laptop microphone into a live noise level display. Press start, allow microphone access, and the approximate decibel level of your surroundings appears instantly, along with a running average and a peak-hold value for the loudest moment of the session. Everything runs inside your browser; nothing is recorded or uploaded.
One honest sentence before the fun: phone microphones are not calibrated instruments. Two phones in the same room can read several dB apart, and browsers add their own processing on top. So treat the number as an estimate, excellent for comparing environments and spotting trends, and not a substitute for a professional SPL meter where legal limits or workplace safety are involved.
Reading the Numbers
Decibels are logarithmic, which trips up intuition: an increase of 10 dB means roughly ten times the sound energy and about twice the perceived loudness. Some anchors to hang the numbers on:
| Approximate dB | Sounds like |
|---|---|
| 30 | Whisper, quiet library |
| 40-50 | Calm home, quiet office |
| 60-65 | Normal conversation |
| 70-78 | Busy street, lively restaurant, vacuum cleaner |
| 85+ | Heavy traffic, blender · the level where sustained daily exposure starts to matter |
| 100+ | Concerts, power tools · uncomfortable quickly |
The 85 dB line is worth knowing: occupational guidelines treat sustained exposure around and above it as the zone where hearing protection starts earning its keep. A phone reading is too rough to police that line precisely, but if your daily environment consistently pushes the meter deep into the orange, that is a real signal worth acting on.
What People Actually Measure
- Sleep and work environments. Is the bedroom actually quiet, or is that fridge hum louder than it feels? Averages over a minute answer it.
- Noise complaints, roughly. A neighbor dispute will not be settled with a phone reading, but “my living room averages 68 dB when their music is on versus 41 dB when it is off” is a genuinely useful comparison, because the difference between two readings on the same device is far more trustworthy than either absolute number.
- Speaker output checks. Play music at your usual volume and see where the room lands. This pairs naturally with our speaker cleaner: a speaker that reads noticeably quieter than it used to at the same volume setting is often just clogged with dust.
- Peak hunting. The peak-hold value catches short events, a door slam, a bark, a motorcycle passing, that the live number is too fast to read.
Getting the Most Consistent Readings
Hold the device still with the microphone unobstructed, keep fingers and cases away from the mic pinhole, and avoid wind, which reads as a huge false spike on every phone. For before/after comparisons, use the same device in the same position, since consistency is where an uncalibrated meter is actually strong. And if the meter reads suspiciously low everywhere, run the microphone test first: a dust-blocked mic pinhole flattens these readings exactly like it muffles your calls.
FAQ
How accurate is a phone sound meter?
As an absolute instrument, roughly within 5 to 10 dB of reality depending on the phone, which is why this tool labels every reading approximate. As a comparison tool on the same device, it is much better: differences between two readings are far more reliable than either number alone.
What is a normal noise level for a room?
A calm home room typically sits around 40 to 50 dB, a quiet bedroom at night lower still. Normal conversation reads around 60 to 65 dB. If your "quiet" room reads well above 50, something is humming: fridges, fans and street noise are the usual suspects.
How many decibels is dangerous?
Risk comes from loudness combined with time. Occupational guidelines start caring around 85 dB for sustained daily exposure, and the safe duration shrinks quickly as levels rise. Short peaks at a concert differ from eight hours beside a machine; for anything involving your actual safety, a calibrated meter and professional guidance are the right tools.
Does this sound meter record me?
No. The microphone signal is analyzed live in your browser to compute a level, and the audio itself is never recorded, stored or sent anywhere. Closing the page releases the microphone immediately.
Why does my meter read differently from my friend's phone?
Different microphones, different housings, different processing. Uncalibrated devices disagree by several dB as a matter of course. For meaningful comparisons, measure both environments with the same device rather than the same environment with different devices.