Runs in your browser. Nothing is uploaded.
Decibel Meter
Estimate how loud the room is with your microphone. The number is relative, not a certified sound-pressure reading.
90 dB
Browsers cannot know microphone sensitivity. Compare with a known meter and move the offset until the numbers agree.
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dB, estimated
Press startMinimum
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Maximum
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Average
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More tests
What it measures
Level
A smoothed reading of how loud the microphone input is, plus a plain-language label.
Range
The quietest, loudest, and average levels since you started or reset the meter.
Questions
Is this a certified sound meter?
No. Phone and laptop microphones are not calibrated. Use the offset if you want the number closer to a real meter, and treat the result as a comparison, not a legal measurement.
Does the audio leave this page?
No. The microphone is analyzed in the browser and stopped when you leave or press stop.