Decibel Meter — Free Online Sound Level Meter
Measure how loud it is right now with this free online decibel meter. It uses your microphone and runs entirely in your browser — no app to install, no audio upload, no recording.
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- Average
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- Max
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- Peak
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Microphone is off. Press "Start measuring" to begin.
Audio is analysed locally in your browser and never recorded or uploaded. Values are estimates, not calibrated measurements — how accurate is this?
How to use this sound meter
- Press Start measuring and allow microphone access when your browser asks.
- Watch the live estimated sound level, the meter, and the history graph.
- Use Pause to freeze the readings and Reset to clear the statistics.
The statistics panel shows the current, minimum, average, maximum, and peak estimated levels since the last reset. Pausing or leaving the page releases your microphone.
How accurate is an online decibel meter?
This tool shows an estimated sound level based on your device's microphone and browser audio pipeline. It is not a calibrated professional SPL meter, and readings can differ between devices. It is well suited to comparing loudness — for example checking whether a room, appliance, or event is getting louder — but not to certified measurements. Read how the estimation works and what its limits are.
What do decibel levels mean?
| Approximate level | Typical example |
|---|---|
| 30 dB | Quiet bedroom at night, whisper |
| 50 dB | Quiet office, moderate rainfall |
| 60 dB | Normal conversation |
| 70 dB | Vacuum cleaner, busy traffic |
| 85 dB | Heavy city traffic, loud restaurant |
| 100 dB | Motorcycle, nightclub |
| 110 dB+ | Rock concert, chainsaw |
Prolonged exposure above roughly 85 dB can damage hearing. Treat the values above as orientation only, and treat this tool's readings as estimates.
Privacy: your audio never leaves your device
The sound level is computed locally in your browser from your microphone signal and discarded immediately. There is no recording, no storage, and no upload — ever. Read the privacy policy.
Frequently asked questions
Is this online decibel meter accurate?
It shows an estimated sound level, not a calibrated measurement. Browser microphones differ per device and may apply processing, so values are useful for comparing loudness but should not be treated as professional SPL readings.
Does this sound meter record or upload my audio?
No. All audio is analyzed in memory inside your browser and discarded immediately. Nothing is recorded, stored, or sent anywhere.
Why does the tool ask for microphone permission?
Measuring sound requires microphone input. The browser asks for permission before any audio is captured, and the microphone is released when you pause or leave the page.
How is this different from a real sound level meter?
A professional sound level meter is a calibrated instrument with a known microphone and standardized weighting. This tool uses your device’s uncalibrated microphone, so it provides estimates rather than certified measurements.