Free · No download · Works in your browser
A professional sound level meter in your browser. This free dB meter gives you A-weighted readings, OSHA compliance tracking, and real-time analysis for classrooms, workplaces, and environmental monitoring.
Everything you need for serious sound measurement, right in the browser.
A-weighted measurements with ±2 dB typical accuracy — the same weighting curve used by professional sound level meters for workplace and environmental monitoring.
No downloads, no sign-up, no cost. Open the page, grant microphone access, and start measuring in seconds on any device with a browser.
Live TWA and dose-percentage calculations with alerts at the 85 dBA action level and 90 dBA permissible exposure limit, plus exportable CSV reports.
Your microphone captures sound waves in real time
An A-weighting filter matches human hearing sensitivity
RMS analysis converts the signal to decibel levels
Live dBA readings, waveform, and frequency spectrum
Accuracy: ±2 dB typical · Best for: preliminary assessments & ongoing monitoring · Not for: legal compliance documentation
Interactive comparison of common sounds, from a whisper to a rocket launch
View chart →Top 7 hardware meters tested, reviewed, and compared for 2026
Read review →The complete workplace noise safety and compliance guide
Read guide →Free OSHA & NIOSH 8-hour TWA and dose calculator for workplace exposure
Calculate dose →Start using the free online decibel meter now — no download, no sign-up required.