Classroom Noise Level Meter & Noise Monitor
A visual classroom noise monitor that turns your microphone into a green, amber and red display the class can manage itself against.
🔒 Privacy: No audio is recorded or transmitted. All processing happens locally in your browser.
This free classroom noise level meter listens through your device microphone and shows the room a colour: green while the volume is where you want it, amber as a warning, red when it has gone too far. Set the two thresholds to match the room and the activity — silent reading and a practical lesson are not the same bar — and pick the theme your class responds to: classic, traffic light, animals or space. Put it full-screen on the projector and students see the level climbing before you have had to say anything. No audio is recorded, stored or sent anywhere; sound is analysed in your browser and discarded as it goes.
Ready to plan around your noise level meter?
Use Kuraplan to turn classroom tasks into lesson plans, worksheets, rubrics, and assessments aligned to your curriculum.
Generate Teaching ResourcesFeatures
- Real-time sound visualization
- Color-coded zones (green, yellow, red)
- Customizable threshold levels
- Full-screen mode for display
- Four themes: classic, traffic light, animals and space
- Nothing is recorded — the microphone is read in your browser only
How to Use
- 1Allow microphone access when prompted
- 2Display on screen or projector
- 3Set acceptable noise thresholds
- 4Students monitor their own volume
- 5Use visual feedback for self-regulation
Why a visible noise monitor changes the room
- Students self-correct when they can see the level rising, so you stop being the volume police
- A colour change is faster than words and interrupts nobody who is working
- Two adjustable thresholds, so silent work and group work each get a fair bar
- Four themes — classic, traffic light, animals and space — for different age groups
- Full-screen mode is readable from anywhere in the room
- Nothing is recorded or uploaded: the microphone is read in your browser only
- It shows relative loudness, not calibrated decibels — a classroom cue, not a measuring instrument
- Free, no account, and no software to install — it just needs microphone permission once
When a classroom noise meter helps
Group work that must stay at working volume
Collaborative talk is meant to be audible — the amber band is where you set "loud enough to work, quiet enough to think".
Silent reading and tests
Drop both thresholds and the display makes the expectation visible without you repeating it.
Practical and lab lessons
Equipment is noisy, so raise the bar for the lesson rather than fighting the room.
Teaching younger classes what "inside voice" means
The animal theme gives an abstract expectation a picture that five-year-olds can act on.
Wet break and indoor lunch
A meter on the board keeps a room full of unstructured time from escalating unnoticed.
Cover and supply lessons
A visible standard does some of the work when a class does not know you yet.
Transitions between activities
Pair it with a countdown so pack-away has both a time limit and a volume limit.
Explore toolRewarding a class that keeps it green
The display is the evidence, so class points stop being a matter of opinion.
Frequently Asked Questions
Does this record audio?
No! The noise meter only measures sound levels - no audio is recorded, stored, or transmitted. All processing happens locally in your browser.
What do the colors mean?
Green means acceptable noise level, yellow is a warning, and red means too loud. You can customize these thresholds.
Can I change the sensitivity?
Yes! Adjust the thresholds for each zone to match your classroom expectations and environment.
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