Sound Meter - Decibel dB Meter

Sound Meter turns your phone's microphone into a simple, honest sound level meter. See how loud it is right now, how loud it has been on average, and how much of a day's safe noise exposure you have used.

WHAT IT MEASURES
• Live sound level in dB(A), dB(C) or dB(Z), on a clear dial from 20 to 130 dB
• Fast or Slow response, as on a real sound level meter
• Min, Leq (the true average), Max and Peak for the current session
• A chart of the last two minutes
• A plain-language band for every level: from very quiet to painful

NOISE DOSE
How much of a full day's safe exposure the session has used, under NIOSH (85 dB(A), 3 dB exchange) or OSHA (90 dB(A), 5 dB exchange) limits, with the projected 8-hour dose and the time left before 100 %.

SAVE AND COMPARE
• Save sessions with a label (office, bedroom, workshop…), each with its chart and full statistics
• Delete with undo, export everything or a single session's chart as CSV
• A home-screen widget shows your last saved session

REFERENCE
Typical levels of everyday sounds, from breathing to fireworks, and a table of how long you can be exposed to each level before it counts as a full day's noise. The sound nearest your live reading is highlighted.

CALIBRATION
Phone microphones differ by several dB. Hold your phone next to a calibrated sound level meter, enter its reading, and the app corrects itself. One tap resets it.

HONEST ABOUT ITS LIMITS
• Uses the microphone input Android reserves for measurement, with automatic gain control off
• Warns when the microphone is overloaded and the true level is higher
• Keeps the screen awake while measuring (can be turned off)
• 15 languages, light and dark theme

PRIVACY
The sound is analysed on your device and immediately discarded. Nothing is recorded, stored or uploaded. The microphone is only used while the app is open on screen. No accounts, no sign-in.

SOURCES
Exposure limits follow NIOSH Criteria for a Recommended Standard: Occupational Noise Exposure (DHHS publication 98-126): https://www.cdc.gov/niosh/publications/numbered/98-126.html and OSHA 29 CFR 1910.95: https://www.osha.gov/laws-regs/regulations/standardnumber/1910/1910.95 . Everyday sound levels are typical figures. Sound Meter is not a certified measuring instrument, is not medical advice, and is not affiliated with NIOSH, OSHA, the CDC or any government body.