Classroom noise monitor
A big, friendly traffic light that shows your class how loud they are. Perfect for group work, libraries, study halls and offices.
--dB(A)
- Quiet streak
- 00:00
- Too-loud moments
- 0
100% private. Audio is analysed on your device and is never recorded or uploaded.
How to use it in class
- 1
Put it on the big screen
Open this page on the classroom computer, press Start and switch to full screen.
- 2
Set your levels
Agree with your class what “working voices” means. Around 55–65 dB suits group work; below 45 dB suits silent reading.
- 3
Celebrate quiet streaks
Use the quiet-streak timer as a reward goal: for example, five minutes of green earns a break.
Tips for a calmer classroom
- Introduce the monitor as a helpful tool, not a punishment.
- Calibrate once with a phone meter so the numbers mean the same every day.
- Place the computer microphone in the middle of the room, away from the teacher’s desk.
- Children’s voices are high-pitched; A-weighting is the right choice.
Frequently asked questions
What is a normal classroom noise level?
Quiet individual work is typically 40–50 dB, group work 55–70 dB. The WHO recommends background noise below 35 dB(A) in empty classrooms.
Does it record the class?
No. The audio is analysed live on the device and never recorded or sent anywhere, so it is safe for schools.
Can I use it in an office or library?
Yes. Set green and red levels that fit your space and it works the same way.