Compare two rooms
Check whether one space is clearly louder than another on the same device.
Decibel meter online
Estimate the sound level
Allow the microphone to see a live dB estimate plus min, average, and max for this session.
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dB
Not listening
Min
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Avg
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Max
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Free decibel meter online
Read an estimated sound level in the browser
This decibel meter online uses the device microphone to estimate loudness as a number. Start listening, then read the live value plus min, average, and max. Audio stays on this device and is never recorded. The reading is an estimate, not a calibrated meter, and is not valid for legal or occupational measurements.
Classroom ideas
When to use: decibel meter online
Everyday noise checks
Get a ballpark reading for a classroom, office, or home before you change anything.
Classroom follow-up
Use the number here, then open bouncing balls or the quiet challenge for a shared visual.
How it works
From setup to result in three steps
No account or installation. Open the tool, choose the classroom settings, and keep control in this browser.
- 1
Start and allow the microphone
Listening begins only after you press Start. The browser asks for microphone access once.
- 2
Hold still for several seconds
Watch the live value and the min, average, and max for this session.
- 3
Adjust offset if needed
Offset shifts the displayed estimate; it does not calibrate the microphone. Stop when done so the mic is released.
Teacher tips
Use the tool as a clear classroom signal while keeping the learning task at the center.
- Compare the same activity before and after on one unchanged device setup; do not treat this estimate as a safety threshold.
- A covered microphone or browser noise suppression will shift the reading.
- For a class volume game, use bouncing balls or the quiet challenge.
Questions and answers
Frequently asked questions
Is this meter accurate?
It is an uncalibrated estimate. Use it to compare on the same device, not for legal measurements.
Is audio recorded or uploaded?
No. The browser reads volume locally. Nothing is saved or sent.
Why do I need microphone permission?
The page cannot estimate loudness without access to the current device microphone.
What do min, average, and max mean?
They are the lowest, mean, and highest estimates since you pressed Start or Reset.
How is this different from bouncing balls?
This page shows a number. Bouncing balls and the quiet challenge turn volume into a classroom signal.