Noise Level Meter

Measure ambient sound levels in real time with a live decibel gauge.

Allow microphone access to see live dB readings.

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How to use Noise Level Meter

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Step 1

Click Start Measuring and allow microphone access.

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Step 2

Read the live dB value and label on the gauge.

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Step 3

Watch the peak value and history bars for changes.

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Step 4

Click Stop when you are finished measuring.

How Noise Level Meter works

Noise Level Meter uses the Web Audio API to read your microphone stream and analyze the audio signal in real time. It calculates the root-mean-square (RMS) amplitude from audio samples, converts that into an estimated decibel value, and updates a live gauge, peak reading, and short history chart. Because microphones differ by device and environment, the reading is an approximation rather than a calibrated SPL measurement. No audio is recorded or stored during the analysis.

Why use this Noise Level Meter?

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Step 1

Check room noise before calls, recordings, or study sessions.

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Step 2

Track peaks and quick changes with the history bars.

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Step 3

Run measurements instantly without installing an app.

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Step 4

Keep audio on-device with browser-based processing.

Frequently asked questions

Is this noise level meter accurate?

It provides an approximate reading based on your microphone and browser. Microphones are not calibrated, so treat the value as a relative indicator. For precise SPL measurements, use a dedicated sound level meter.

Why do the numbers change between devices?

Each device has different microphone sensitivity and processing. Rooms, distance, and background noise also affect readings. Use the same device and position when comparing results.

Does the tool record or store audio?

No. Audio is analyzed in real time in your browser and is not saved or uploaded. Closing the page stops the microphone.

Why am I seeing 0 dB or no reading?

Make sure you have granted microphone permission and that the correct input device is selected. Some browsers block mic access on insecure connections. Try refreshing the page and starting again.

Can I use an external microphone?

Yes. If your browser detects the external mic, it can be used for readings. External microphones can improve consistency.

dB Reference Levels

20 dBWhisper, quiet room

40 dBLibrary, light rain

60 dBNormal conversation

80 dBBusy traffic, vacuum cleaner

100 dBConcert, power tools

120 dBPain threshold, jet engine