Decibel Meter
Real-time dB meter with peak/average, trend history, and calibration offset.
Decibel Meter
Real-time noise monitoring with peak and history
Noise Level · Very Quiet
Current dB
--dB
0306090120
StatusIdle
Average dB
-- dB
Peak dB
-- dB
Recent Trend10s
120
0
Note
Values are relative estimates; results vary by device and environment
Calibration Offset0 dB
Fine-tune based on a real sound meter
Smoothing0.80
Higher value means smoother response
Audio is processed locally and never uploaded
Noise Level
Very Quiet0-30 dB
Quiet31-50 dB
Conversation51-70 dB
Noisy71-85 dB
Loud86-100 dB
Potentially Harmful101-140 dB
Common Noise Reference
20-30 dBWhisper, library
40-60 dBOffice, conversation
70-85 dBBusy street, traffic
90-100 dBMotorcycle, loud music
110+ dBConcert, siren
About This Tool
This full-featured online decibel meter uses Web Audio to analyze microphone input in real time. It shows current, average, and peak values to quickly assess ambient noise levels. A trend chart visualizes fluctuations, while calibration offset and smoothing help tune responsiveness for your device. Everything runs locally to protect your privacy.
Features
- 🎙️ Real-time: Live mic sampling with fast updates
- 📊 Multi-metrics: Current, average, peak values with level hint
- 📈 Trend view: Recent fluctuations at a glance
- 🎛️ Tunable: Adjustable smoothing and calibration offset
- 🎧 Device choice: Switch between microphones
- 🔒 Privacy: Audio stays local with no uploads