Classroom Noise Meter
Show your class how loud the room is on a big live meter: set a noise limit, see quiet, getting loud and too loud at a glance, and track how long the class stays quiet. The microphone is measured in your browser and nothing is recorded.
A classroom noise meter listens through your device's microphone and shows the room's loudness as a bar that turns from green to amber to red as it nears your limit. Classeem measures the sound in your browser only — nothing is recorded, saved or sent — counts each time the class goes over the limit, and times the current and longest quiet stretch. The level is relative (0 to 100), not calibrated decibels.
Noise level
Press Start listening and allow the microphone.
Quiet for
0:00
Longest quiet
0:00
Too loud: 0 times
The sound is measured in this browser only. Nothing is recorded, saved or sent. Relative level (0–100), not calibrated decibels.
How does a classroom noise meter work?
The meter measures how strong the microphone signal is many times a second, smooths it so it rises quickly and falls gently, and compares it with the limit you set.
Microphones and rooms differ, so the level is relative: 70 on one laptop is not 70 on another. Set the limit by watching the meter during a normal work voice, not by a number from another classroom.
How to use the classroom noise meter
- 1Press Start listening and allow the microphone when the browser asks.
- 2Set the noise limit: the black mark on the meter. Raise the sensitivity in a quiet room or if the device is far from the class.
- 3Press Full screen and put the meter on the board.
- 4Watch the quiet timer and the too-loud count; press Reset counters for a new activity, and Stop when you are done.
When this is useful
Independent work time
Set the limit just above a whisper and challenge the class to keep the quiet timer running.
Group work
A higher limit for partner talk: the bar turns amber before it gets too loud, so groups can adjust themselves.
Transitions and tidying up
Count the too-loud moments during a transition and aim for fewer next time.
Teaching voice levels
Show what a whisper, a partner voice and a presenting voice look like on the meter.
Examples to try
Silent reading: a starting point
Try limit 55 with sensitivity 6, then adjust: if turning pages makes the bar amber, raise the limit; if whispering stays green, lower it.
Partner talk: a starting point
Try limit 75 with sensitivity 5, then watch a minute of normal discussion and set the limit a few points above where the bar sits.
Quiet challenge
Reset the counters and see whether the class beats its longest quiet time.
Tips for better results
Calibrate for this room and activity
Ask for the voice you want for the activity, watch where the bar sits for 20–30 seconds, and set the limit a few points above it. Do it again when you change the room, the device, where it stands, or the activity.
Keep the device still
Moving the laptop or tapping near the microphone shows up as noise.
Praise the quiet timer
A visible streak works better than reacting to every red flash.
Chime off by default
The soft chime is optional; many classes respond to the color alone.
How the classroom noise meter works
The browser reads the microphone through the Web Audio API and computes its loudness (RMS) about 60 times a second. That value is mapped to a 0–100 level using the sensitivity setting and smoothed like a VU meter. A too-loud moment starts when the level reaches your limit and ends after two seconds back under it, so one loud burst counts once.
Audio never leaves your device: nothing is recorded, saved or uploaded, and the microphone is released when you press Stop or leave the page.
Private by design
- No account and no sign-up. Just open it and start.
- The microphone is used only while the meter is on: your browser turns the sound into a loudness level on your device, and the sound is never recorded, saved or sent.
- Nothing you create is uploaded. No values, names, scores, or generated content are sent to our servers. If you're signed in, My Classeem's Recent Activity notes which tools you used — never what you did in them.
- We use Google Analytics for anonymous, aggregate measurement: page views and a few usage events, such as a worksheet being printed or a game round starting or finishing (with the mode played). It never receives what you enter — no answers, scores, names, or generated content.
Frequently asked questions
Is the sound recorded or sent anywhere?
No. The level is calculated in your browser while the meter runs. Nothing is recorded, saved or uploaded, and the microphone is released when you press Stop.
Does it show real decibels?
No. It shows a relative level from 0 to 100. Calibrated decibels need a measuring microphone; for a classroom, a consistent relative level on the same device is what matters.
Why does the browser ask for the microphone?
The meter needs to hear the room. If you block it, allow the microphone in the browser's site settings and press Start listening again.
Does it work on a tablet or phone?
Yes, in a current browser on a secure page. iPads and phones may lower the microphone level automatically; raise the sensitivity if the bar barely moves.
Can I put it on the projector?
Yes. Full screen shows the meter, the status and the counters large enough for the back of the room.
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Station Rotation Timer
Run centers on the board: who goes where, a big timer, a move-now signal, and a printable rotation chart.
Random Name Picker
Paste your class list and pick a random student fairly, with no-repeat turns and pick history.
Always free · No account needed · Nothing you type leaves your device unless you choose to save it.