Free Online Decibel Meter - Live dB SPL via Microphone

Decibel Meter

Press Start and allow microphone. Live dB reading, peak, and average update in real time.

Press Start to use your microphone for live dB SPL measurement. Browser readings are RELATIVE - real SPL needs hardware calibration. Useful for comparing relative loudness, not absolute reference.

dB SPL (relative)

Peak dB--

Average dB--

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Decibel Meter guide

How to use the Decibel Meter accurately

A browser-based decibel meter uses your devices microphone to measure ambient sound levels in real time, displaying readings in dB (decibels SPL). Useful for checking noise in offices, gaming setups, restaurants, and music studios.

01 What Is an Online Decibel Meter? A browser-based decibel meter uses your devices microphone to measure ambient sound levels in real time, displaying readings in dB (decibels SPL).

02 How to Read the dB Numbers 30-40 dB: Whisper, very quiet room.

03 Use Cases Workspace noise check - Verify your office is below the OSHA 85 dB safe threshold.

04 Related Audio Tools Microphone Tester

decibel meter dB meter online sound level meter SPL meter Decibel Meter Audio

Decibel Meter FAQ

Common decibel meter questions

Is this tool free to use?

Yes. The test runs in your browser with no account, download, or installation required.

Does the test upload my device data?

No. The live check is handled locally by the page wherever browser APIs allow it.

Why should I repeat the test?

Browser focus, permissions, wireless devices, and operating-system settings can affect a single run, so repeated tests give a clearer result.

Checklist

Audio checks to confirm

What Is an Online Decibel Meter? A browser-based decibel meter uses your devices microphone to measure ambient sound levels in real time, displaying readings in dB (decibels SPL).
How to Read the dB Numbers 30-40 dB: Whisper, very quiet room.
Use Cases Workspace noise check - Verify your office is below the OSHA 85 dB safe threshold.