Microphone Level Meter: Monitor Relative Input Levels
Start explicitly and allow only the requested device. Check the preview or signal, then stop. Microphone audio is not played through speakers. Sound tests are quiet by default and stop after 10 seconds.
Results
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How to use this tool
Start explicitly and allow only the requested device. Check the preview or signal, then stop. Microphone audio is not played through speakers. Sound tests are quiet by default and stop after 10 seconds.
| Results | Method and units |
|---|---|
| RMS | √(Σ sample² / N) |
| dBFS | 20 × log₁₀(RMS) |
| Peak | 20 × log₁₀(max |sample|) |
Example
RMS: 0.1 · dBFS: −20 · Peak: −10 dBFS
What this test can and cannot tell you
Results reflect events and signals available to your browser. Settings, permissions and device support can affect them; they do not certify that hardware is healthy or faulty.
Microphone dBFS is a digital signal level, not room dB SPL
Allow access only when you want to run the test. Stop the test to release the device.