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
Measure sound levels in real time using your phone microphone. Get instant decibel readings (dB), noise scores, and sound classification — 100% private.
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 are relative estimates, not calibrated dB SPL.
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 dB Level
See live estimated decibel readings updated continuously
Peak & Average
Track peak, average, and peak-hold sound levels
Noise Score
Simplified 0–100 score for quick noise assessment
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 your dB level, noise score, and detected sound class
Sound & Noise Guides
Educational articles about noise measurement
The Complete Guide to Noise Levels and Decibels
The definitive resource covering everything about noise levels, decibels, safe sound exposure, and how to measure environmental noise — from whispers to jet engines.
25 min readSafe Sound LevelsWhat Noise Level Is Safe for Humans?
Understand recommended noise exposure limits and how long you can safely be exposed to different sound levels without risking hearing damage.
8 min readNoise BasicsTypical Noise Levels in Everyday Life
A comprehensive guide to common sound levels you encounter daily, from whispers to concerts, with practical decibel comparisons.
10 min readTraffic & City NoiseHow Loud Is Traffic Noise?
Explore typical traffic noise levels and understand how road noise affects your environment, health, and quality of life.
9 min readWorkplace NoiseHow Loud Is Construction Noise?
Learn about typical construction site noise levels, when hearing protection becomes necessary, and how nearby residents are affected.
9 min readMeasurement TipsHow Accurate Are Phone Noise Meters?
Find out how smartphone sound meter apps work, their accuracy compared to professional meters, and when they're practical for everyday use.
9 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?
Phone-based meters provide reasonable estimates for everyday noise assessment, but they are not calibrated instruments. Snap Decibel Meter applies no calibration or A-weighting, so we state no accuracy tolerance — treat the reading as a relative indicator of how loud your surroundings are.
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