Classroom noise meter
A noise meter for the classroom: it uses the microphone to show the noise level in green, yellow or red and warns you when it goes over the limit.
How to useClassroom noise meter
Available in: 
Classroom noise meter: what it is for
Turn on the microphone and the meter shows the room's noise level on a 0 to 100 scale, with colors and faces that change from green to yellow and red when it passes the limit you set. It counts how many times the limit was exceeded and can go full screen on the projector.
Audio is analyzed in the browser and isn't recorded.
How to use
- Turn on the microphone.
- Set the limit while the room is quiet.
- Go full screen on the projector.
When to use it
- Managing noise during activities.
- Teaching kids to control their voice level.
- Monitoring noise in offices and libraries.
Frequently asked questions
Is it a real decibel meter?
No. The level is relative and depends on each device's microphone, so the tool shows a 0 to 100 scale instead of decibels. For official noise measurements, use a calibrated sound level meter.
Is the sound recorded?
No. The microphone audio is analyzed in real time in your browser and isn't recorded or sent anywhere.
How do I adjust it for my classroom?
Have the class be quiet, check the level and set the limit a little above it. The screen turns red only when talking goes past that point.
Is it really free?
Yes, 100% free. No sign-up, no subscription and no usage limits. All Tools123 tools are free and run right in your browser.