Noise Meter
Measure sound levels via your microphone in real time — right in the browser, no app installation required.
How to use
- 1Click "Start measuring"
The browser will ask for microphone permission. Allow it so the tool can analyse audio.
- 2Watch the reading
The noise level is shown in real time. The colour scale indicates the category: quiet, normal, loud, or very loud.
- 3Check the category
Use the colour guide: green — quiet (<30 dB), blue — normal (30–60 dB), yellow — loud (60–85 dB), red — very loud (>85 dB).
- 4Stop measuring
Click "Stop" — microphone access is released immediately.
Use cases
Home
Check noise from neighbours, ventilation, or appliances. See whether a room is comfortable for sleeping or focused work.
Workplace
Verify that an office or co-working space meets noise standards. Monitor surroundings before an online meeting or recording session.
Study
Find a quiet spot to study. Explore sound levels as part of a school or university project in physics or environmental science.
Hearing safety
Keep noise below 85 dB — the threshold above which prolonged exposure can cause hearing damage according to WHO guidelines.
Frequently Asked Questions
How does the noise meter work?
The tool accesses your microphone via the Web Audio API, reads the signal amplitude, computes RMS, and converts it to decibels using the formula 20·log₁₀(rms). Everything happens locally in the browser — audio is never transmitted anywhere.
How accurate are the readings?
The readings reflect relative sound levels and are well suited for assessing ambient noise. For professional measurements to industry standards a calibrated sound level meter is required.
My browser is asking for microphone permission — is that safe?
Yes. The tool requests the microphone only to analyse sound levels. Audio is not recorded and is never sent to any server — everything is processed locally.
What do the noise categories mean?
Quiet (< 30 dB) — library or night-time silence. Normal (30–60 dB) — ordinary conversation or an office. Loud (60–85 dB) — busy street or loud music. Very loud (> 85 dB) — a level at which prolonged exposure may cause hearing damage.
Does the tool work on mobile devices?
Yes, on modern smartphones and tablets running Chrome, Firefox, or Safari.
What if the browser does not ask for permission?
Make sure the site is opened over HTTPS. Some browsers block microphone access on insecure connections. Also check your browser privacy settings.