Overview

Noise Decibel Meter is a free online sound level meter that measures real-time noise levels directly in your browser. Using your device's microphone and the Web Audio API, it delivers instant decibel (dB) readings without any app download, account, or cost. All audio is processed locally on your device, so no sound data is ever recorded, stored, or sent to a server—keeping your measurements fully private.

Key Features

Real-time dB readings — live sound level measurement the moment you hit start
dBA & dBC weighting — switch between A-weighting (human hearing) and C-weighting (low-frequency sounds like bass and machinery)
60-second history graph — visualize noise spikes and trends over time
Min / Avg / Max stats — automatic session summaries
CSV export — save a timestamped log of your readings
Privacy-first — all processing happens locally; nothing leaves your device
Cross-device — works on any modern browser (Chrome, Safari, Firefox, Edge) across desktop, tablet, and mobile
Decibel reference chart — built-in guide to common sound levels
Multilingual — available in English, Spanish, French, Japanese, Portuguese, and Chinese

Use Cases

Home — check noise from appliances, HVAC, or noisy neighbors
Office & workplace — monitor ambient noise and identify disruptive levels
Outdoors — measure traffic, construction, or venue noise
Hearing protection — track exposure and stay aware of damage-risk levels (85+ dB)
Sleep & wellbeing — assess night-time noise against WHO recommendations
Content creators & musicians — quick environment checks before recording

Note: for legally compliant occupational assessments (OSHA, ISO 61672), pair the tool with a certified hardware meter—browser readings are accurate within ±2–3 dB, ideal for everyday awareness and trend monitoring.

Getting Started

Open noisedecibelmeter.com in any modern browser
Click Start Measuring
Grant microphone access when prompted
Watch live dB readings appear instantly
Switch between dBA/dBC, review your history graph and stats, and export a CSV log if needed
Hit Stop when finished

No installation, no sign-up, no setup.

Pricing

100% free, forever. No subscription, no account, no hidden costs, no ads required to unlock features. Every feature—real-time measurement, weighting modes, history graph, and CSV export—is fully available at no charge.