Real-Time
Decibel Meter.
Measure noise levels instantly using your browser. No app required. Accurate sound pressure level (SPL) detection for home, office, and construction sites.
Live Sound Level
0
dBsession statistics
0 dB
Peak Level
0 dB
Average Level
0
Input Samples Processed
Privacy Guaranteed
Your audio is processed purely through the Web Audio API locally in your browser. Wave data never touches our servers.
Technical Note
Web-based meters are approximate. Results depend on your microphone quality and distance from source. For safety-critical acoustic measurement, use a calibrated Class 1 sound level meter.
The Complete Acoustic Safety Guide (2026)
Hearing is one of our most precious senses, yet noise pollution is becoming an invisible epidemic. Whether you are checking if your workplace is safe, testing your home's soundproofing, or ensuring your headphones aren't too loud—our free Online Decibel Meter provides instant, actionable acoustic data.
OSHA Compliance
Identify hazardous sound levels in work environments.
Audio Testing
Tune your speakers or home theater balance.
Hearing Health
Monitor safe listening levels for your ears.
What is a Decibel (dB)?
A decibel is a logarithmic unit used to measure the intensity of a sound. Unlike linear scales (like meters or kilograms), the dB scale is based on powers of 10. This means that a sound of 20dB is 10 times more intense than 10dB, and a sound of 30dB is 100 times more intense. For human hearing, an increase of 10 decibels reflects a perceived "doubling" of loudness.
How Safe is Your Environment? (Reference Table)
| Level (dB) | Description | Exposure Limit |
|---|---|---|
| 20-30 dB | Total silence, library, soft whisper | Unlimited |
| 50-60 dB | Quiet office, normal conversation | Unlimited |
| 85 dB | Heavy traffic, noisy restaurant | 8 Hours / Day |
| 95 dB | Lawn mower, hair dryer | 1 Hour / Day |
| 110 dB | Rock concert, leaf blower | 2 Minutes / Day |
| 140 dB | Jet take-off, gunshot (close range) | Immediate Damage |
How Our Web Meter Works
This tool utilizes the Web Audio API, a high-level JavaScript API for processing and synthesizing audio in web applications. When you click "Start," the browser initializes a MediaStream from your microphone. We then attach an AnalyserNode to this stream to convert raw time-domain audio data into usable amplitude values.
We calculate the Root Mean Square (RMS) of the audio signal to determine its volume over a specific time window. This value is then converted into decibels using the logarithmic formula: dB = 20 * log10(RMS) + ReferenceOffset.
Audio Privacy First
Most noise-tracking apps require complex permissions and often upload data for "analysis." Toolively is different.
Local Processing
Calculations happen on YOUR device's CPU, not our server.
No Audio Recording
We analyze peak volume but NEVER store or record audio clips.
Frequently Asked Questions
Is this online decibel meter accurate?
Our meter is highly accurate for a web-based tool, but it is limited by your hardware. Standard laptop and phone microphones are uncalibrated and usually "peak" at around 100-110dB. For professional acoustic engineering or legal compliance, we always recommend using a calibrated Type 2 SPL meter.
Why do I need to allow microphone access?
Browsers have strict security policies. To measure sound, the code must have access to your hardware. This permission is temporary and you can revoke it anytime by refreshing the page or clicking the lock icon in your URL bar.
Does this decibel meter work on mobile?
Yes. It is fully compatible with modern browsers on Android and iOS (Safari/Chrome). Note that iOS devices may require an extra user interaction (like clicking "Start") to initialize audio.
Can this measure very high frequency noise?
The standard microphone in your device captures frequencies between 20Hz and 20kHz, which covers the full range of human hearing. Ultrasonic or extremely low infrasonic noise may not be fully represented.
What is the difference between dBA and dB?
Standard dB measures raw sound pressure. dBA is "A-weighted" decibels, which adjusts the reading to match how the human ear perceives different frequencies (we are more sensitive to middle frequencies). Our tool uses a balanced A-weighted approximation.
Can this measure noise through my headphones?
No. This tool measures environmental noise via your microphone. To measure headphones, you would need to place your microphone inside the ear cup, which is often physically impossible with built-in mics. However, it can help you set your room's ambient volume for better listening.
Important Disclaimer
The measurements provided by this tool are for informational and educational purposes only. Do not rely solely on this tool for health or safety decisions (such as hearing protection in industrial environments). Standard consumer electronic microphones are generally not precision-calibrated for absolute acoustic measurement.