Free instant decibel meter — estimate the sound level around you using just your phone. No app install. No signup. 100% private.
Decibel Meter Online — Measure Noise Levels Instantly
Read sound levels in real time using your phone microphone. You get a live A-weighted level, a maximum, a 60-second equivalent level, and the sound character — processed entirely on your device.
Works in Chrome, Safari, Firefox & Edge — no download needed
How loud is your environment right now?
Is it safe for your hearing? Start measuring instantly.
Open Noise MeterBuilt for quick, private sound-level checks at home, at work, and outdoors. Readings start as an uncalibrated dBFS signal level, with optional A-weighting and FAST/SLOW time response; a one-point local calibration can express them as an estimated dBA level on your device. Device and browser uncertainty remains, so this is not a certified sound level meter and must not be used for compliance.
Measure Noise Anywhere
From quiet rooms to loud concerts — measure noise anywhere.
Roads & Traffic
Measure busy road noise levels
Airports
Assess aircraft noise impact
Construction
Monitor construction noise
Offices & Homes
Check indoor sound levels
Nature & Outdoors
Explore environmental soundscapes
Concerts & Events
Monitor event noise intensity
What Is a Decibel Meter?
A decibel meter (also called a sound level meter or noise meter) is a tool that measures the intensity of sound in your environment. Sound intensity is expressed in decibels (dB) — a logarithmic unit that reflects how loud a sound is relative to the quietest sound the human ear can detect.
The decibel scale starts at 0 dB (threshold of hearing) and goes up to roughly 140 dB (threshold of pain). Because the scale is logarithmic, every 10 dB increase represents a tenfold increase in sound energy — meaning 80 dB is not just "a bit louder" than 70 dB, it's ten times more intense.
Snap Decibel Meter turns your phone into a browser-based sound level meter. It uses your device's microphone and the Web Audio API to provide real-time estimated dB readings, making it easy to quickly assess noise in any environment.
How Loud Is Too Loud?
Understanding noise thresholds helps protect your hearing. Here are key reference levels:
According to the WHO and NIOSH, prolonged exposure above 85 dB increases the risk of noise-induced hearing loss. See our decibel level chart for a complete reference, or learn about safe noise levels in detail.
Powerful Sound Analysis
Everything you need to understand your noise environment
Real-Time Level
A live A-weighted level, shown in dBFS until you calibrate
Max & Equivalent
Track the maximum and the 60-second equivalent level
Local Calibration
Match one known reference to read an estimated dBA level
Sound Classification
Identify broad sound categories like traffic, speech, or nature
No App Needed
Use it directly in your mobile browser
Privacy First
All audio processed locally — nothing leaves your device
How It Works
Three simple steps to measure noise
Allow Microphone
Grant microphone access when prompted by your browser
Start Measuring
Tap the Start button to begin real-time noise analysis
Read Your Results
See the live level, the maximum, the equivalent level, and the sound character
Sound & Noise Guides
Educational articles about noise measurement
Noise Levels and Decibels: How to Read Any Figure You Meet
Decibel charts are everywhere and sources are rare. This guide teaches you to interrogate a figure instead of trusting it, and shows where real documentation exists.
25 min readSafe Sound LevelsDaily Noise Exposure: How the Published Limits Are Built
Duration is the part of noise exposure that gets left out. This page explains how the published frameworks combine level and time, in their own terms.
8 min readTraffic & City NoiseHow Loud Is Traffic Noise?
Traffic noise is not a sound with a level; it is an aggregate that depends on how many vehicles, how fast, how heavy, and how far away you are. Here is what the regulatory and modelling record does establish.
9 min readWorkplace NoiseConstruction Noise Rules: What OSHA and NIOSH Actually Require
Construction noise guidance is quoted constantly and cited rarely. This page separates the enforceable limit, the health-based recommendation, and the European scheme.
9 min readHome NoiseNoise and Sleep: What WHO Guidance Actually Measures
There is no published decibel limit for a bedroom. The guidance everyone quotes measures something quite different, and the difference matters.
9 min readMeasurement TipsMeasuring Noise Outdoors: What the Standards Require
Outdoors, the measurement position and the weather often matter more than the source. Here is what the standards actually govern, and what a phone can honestly contribute.
8 min readHow Loud Is…?
Find out the decibel level of common sounds
Decibel Level Guides
Frequently Asked Questions
Is this a professional sound meter?
No. Snap Decibel Meter provides estimated readings using your phone's microphone. It is not a certified professional instrument.
Does it record my audio?
Never. All audio is processed in real time on your device. Nothing is uploaded, stored, or shared.
Does it work outdoors?
Yes. It works in any environment, though wind may affect accuracy. Shield your phone from wind for better results.
Is it free to use?
Yes. Snap Decibel Meter is completely free and works directly in your mobile browser.
How accurate is a phone decibel meter?
A phone microphone has no factory sensitivity figure a browser can read, so no web tool can state an accuracy tolerance. Snap Decibel Meter applies the standard A-weighting curve and shows an uncalibrated digital level (dBFS) until you calibrate it against one known reference on your own device; after that it shows an estimated dBA level, still an estimate rather than a certified measurement.
What is a safe noise level in dB?
Sounds below 70 dB are generally safe for prolonged exposure. At 85 dB and above, hearing damage can begin with extended exposure. The louder the sound, the less time you can safely be exposed.
Can I measure sound with my phone?
Yes. Modern smartphones have built-in microphones capable of estimating environmental noise levels. Snap Decibel Meter uses your phone's mic with the Web Audio API to provide real-time dB readings.
What is a normal room noise level?
A typical quiet room measures around 30–40 dB. Normal conversation is about 60–65 dB. An office environment usually registers 45–55 dB.
Ready to Measure Your Environment?
Open the noise meter and get instant estimated sound level readings — free, private, and directly in your browser.
Start Free Decibel Test