Decibel Meter Online
Measure noise levels in real time with your microphone. This free online decibel meter shows a live dB readout, an animated level bar, and your session minimum, maximum and average. Works in the browser with no signup.
Noise Reference Scale
- Whisper ~30 dB
- Normal conversation ~60 dB
- Busy traffic ~85 dB
- Concert or factory ~120 dB
How to use
- Press the Start button and allow microphone access when your browser asks.
- Watch the live dB reading and the animated level bar move with the sound around you.
- Press Stop to pause, or Reset to clear the min, max and average stats.
Good to know
- Readings are approximate — every device microphone responds differently, so this is a guide, not a calibrated instrument.
- All audio is processed on your device; nothing is recorded or sent anywhere.
- Sounds above about 85 dB can harm hearing with long exposure — use this meter to keep volumes sensible.
- A quiet room usually reads between 30 and 50 dB depending on your device.
- If the microphone is denied, check your browser site permissions and try again.
Frequently Asked Questions (FAQ)
How does the online decibel meter work?
Press Start and allow microphone access. The tool samples your microphone through the Web Audio API and shows a live approximate dB reading, an animated level bar, and your session minimum, maximum and average.
Is the dB reading accurate?
It is an approximation. Every device microphone is different, so use it for relative comparisons, not for calibrated professional measurements.
Is my audio recorded or uploaded?
No. All audio is processed on your device - nothing is recorded or sent anywhere.
What do the noise reference values mean?
The page shows a reference scale: a whisper is around 30 dB, normal conversation around 60 dB, busy traffic around 85 dB and a concert around 120 dB. Sounds above about 85 dB can harm hearing with long exposure.