Sound Level Meter
A free sound level meter that measures noise in real time using your microphone. Displays decibel readings with a visual gauge, peak hold, and history graph.
Free browser-based noise measurement tool
Understanding Noise Levels
Sound is measured in decibels (dB) — a logarithmic scale where every 10 dB increase means the sound is perceived as roughly twice as loud. Understanding noise levels helps protect your hearing and health. Here's what different decibel levels actually mean in everyday life.
Did you know?
Hearing damage from noise is cumulative and permanent — damaged hair cells in the inner ear never regenerate. But it's 100% preventable. If you regularly encounter noise above 80 dB, consider using earplugs or noise-canceling headphones. Your future self will thank you.
Features
How to Measure Noise Levels
- Open this page on your device (phone or computer with a microphone).
- Tap the microphone button and allow browser access to your mic.
- The meter will display the current noise level in decibels (dB).
- Check the comparison bar to see what your noise level is similar to.
- Use the recording feature to save noise as evidence with a timestamped filename.
- Export your session report (CSV) for documentation or analysis.
Why Use Our Sound Level Meter
Unlike other online tools, our sound meter combines accurate measurement with practical features: noise comparison with real-world sounds, NIOSH-based safety warnings, recording capability for evidence, and session reporting. All free, private, and without installing any app.
Frequently Asked Questions
How accurate is this online sound meter?
Browser-based meters provide approximate readings (±3-6 dB). Accuracy depends on your device microphone. For professional measurements, use a certified sound level meter. You can improve accuracy using our calibration feature.
Can I use noise recordings as legal evidence?
Recordings include date and time in the filename for documentation. While browser recordings alone may not meet legal standards, they can support noise complaints as supplementary evidence. Consult local regulations.
What is A-weighting (dBA)?
A-weighting adjusts the measurement to match human hearing sensitivity. Our ears are less sensitive to very low and very high frequencies. dBA is the standard for noise regulations and occupational safety.
What noise level is dangerous?
According to NIOSH, exposure to 85 dB or above for 8 hours can cause hearing damage. At 100 dB, safe exposure drops to just 15 minutes. Our tool shows real-time safety warnings based on these guidelines.
How do I calibrate for accurate readings?
Use the calibration feature: play a known-level tone from a calibrated source and adjust the offset until the meter matches. Alternatively, compare readings with a certified sound level meter app or device. Even without calibration, the meter shows reliable relative changes in dB.
Does this work on mobile phones?
Yes! The sound meter works in any modern mobile browser (Chrome, Safari, Firefox, Edge). Simply open the page and allow microphone access.
We can — and it's free! Just send us a quick message with your idea. If you'd like to discuss it in detail, leave your email and we'll get back to you. You can stay anonymous.
