Decibel Meter
Online sound level meter, measure ambient noise in real time
Decibel Level Reference
What is a Decibel Meter?
A decibel meter is a tool for measuring sound intensity. It captures ambient sound through a microphone and calculates the decibel value in real time. Decibels (dB) are the standard unit for measuring sound levels, widely used in environmental noise monitoring, industrial noise assessment, and audio equipment testing. This tool runs entirely in your browser — no audio data is uploaded to any server, ensuring your privacy.
How to Use
1. Click "Start Detection" and allow the browser to access your microphone 2. Wait for device initialization — the gauge will display real-time dB values 3. Observe the level bar to understand the current noise level 4. The stats panel records minimum, maximum, and average dB values 5. Click "Reset Stats" to clear history and start fresh
FAQ
How accurate are the decibel measurements?
Browser-based decibel measurements are relative values, affected by microphone sensitivity and system gain. They may differ from professional sound level meters. Best suited for relative comparison and trend observation of ambient noise, not as a professional measurement tool.
What sounds correspond to different decibel levels?
0-30 dB: Very quiet (whisper, quiet bedroom); 30-60 dB: Quiet (normal conversation, office); 60-80 dB: Normal (busy street, vacuum cleaner); 80-100 dB: Loud (factory floor, motorcycle); 100+ dB: Dangerous (jet takeoff, rock concert) — prolonged exposure may damage hearing.
Why is microphone permission needed?
Decibel detection requires capturing ambient sound through the microphone. Browsers require user authorization for privacy protection — please click "Allow." All audio processing is done locally in the browser; no audio data is uploaded or stored.