Free Online Sound Meter
Measure decibel levels in real-time with professional-grade accuracy. View frequency spectrum, waveform, and get instant sound classification - all in your browser.
Actual interface shown after microphone access.
Requires microphone access. Audio stays on your device.
About Our Online Sound Meter
Our free online sound meter transforms your browser into a professional audio measurement tool. Using the Web Audio API and your device's microphone, it provides real-time decibel readings, frequency analysis, and waveform visualization without requiring any downloads or installations.
The sound meter displays current, peak, and average dB levels with automatic sound classification ranging from "Silent Room" to "Very Loud." The built-in health score helps you understand whether your environment is safe for prolonged exposure.
Common Noise Levels Reference
Sound Meter FAQ
What is a sound meter?
A sound meter (also called a sound level meter or dB meter) is a device or tool that measures the intensity of sound in decibels (dB). Our online version uses your device's microphone to provide real-time sound level measurements.
How do I measure sound levels online?
Simply click 'Start Measuring' on this page and allow microphone access. The tool immediately begins measuring ambient sound levels, displaying current, peak, and average dB readings in real-time.
What is a safe noise level?
The WHO recommends keeping environmental noise below 70 dB for prolonged exposure. Brief exposure to sounds up to 85 dB is generally safe, but sustained exposure above this level can cause hearing damage.
How accurate is a browser-based sound meter?
Browser-based sound meters provide reliable relative measurements. They're excellent for comparing noise levels between environments and identifying loud vs. quiet conditions, though professional calibrated meters are needed for certified measurements.
Can I use this to check noise at work?
Yes! This tool is perfect for checking workplace noise levels. Monitor your office environment, identify noisy periods, and document noise concerns. For official OSHA compliance measurements, a calibrated meter is recommended.
What's the difference between dB and dBA?
dB measures raw sound pressure, while dBA applies A-weighting that mimics human hearing sensitivity (we're less sensitive to very low and very high frequencies). Our tool provides approximate dB measurements.