Sound Meter: Decibel dB Meter

Sound Meter is a decibel meter, sound level meter (SPL), and noise meter for Android. Turn your phone into a pocket dB meter to measure environmental noise in real time — no extra hardware required.

Whether you check workplace noise near machinery, monitor a loud concert, document a noisy neighbor, or verify a quiet nursery, Sound Meter gives you a clear, live decibel reading you can trust.

▶ MAIN FEATURES
• Real-time sound level meter in dB SPL, updated several times per second
• A / C / Z frequency weighting (dBA · dBC · dBZ)
• Min / average / max dB tracking for every session
• OSHA + NIOSH 8-hour noise dose tracking with TWA (separate criterion and exchange rates)
• One-tap calibration offset for better accuracy on any device
• Peak hold to capture sudden loud spikes
• Measurement history with graph and trends
• Reference chart (whisper, conversation, traffic, concert, jet)
• Dark mode for low-light environments
• Fully offline — no account, no internet needed

▶ HOW TO USE
1. Open Sound Meter and allow microphone access.
2. Watch the live decibel (dB) reading update instantly.
3. Switch between dBA, dBC and dBZ weighting as needed.
4. Calibrate once in a quiet room for best accuracy.
5. Start an OSHA/NIOSH dose session to track 8-hour exposure.

▶ WHO USES IT
• Workers near loud machinery and equipment
• Safety teams checking OSHA / NIOSH compliance
• Musicians, DJs and AV / sound engineers
• Parents checking nursery or bedroom noise
• Neighbors documenting noise complaints
• DIY enthusiasts and acoustics students

Microphone permission is required to measure sound. Note: phone microphones are not lab-calibrated, so use the calibration offset for the best accuracy.