Noise Meter · Chalkbox

Microphone

Room listening

Microphone access stays in this browser. Chalkbox does not record or upload audio.

Theme

Choose a display

Noise zones

Set your classroom

Quiet max30 Too loud starts68 Target max55

Response

Tune the meter

Sensitivity1.0× AveragingSmooths short spikes Warning soundOne soft tone on entering red Dark modeApply your Chalkbox theme preference

0 noise level

Quiet ≤ 30 Working 31–67 Too loud ≥ 68

Ready Start the microphone to begin.

Target ≤ 55

Waiting for microphone

Default calibration