Online Decibel Meter & Sound Level Checker
Check the sound level around you with a free online decibel meter. Use your device’s microphone to view the current, average, maximum and peak estimated dB SPL—without downloading an app or creating an account.
Start Measuring Sound- No recording or audio upload
- No account or installation
- Works on phones and computers
Reference estimate—not a calibrated or compliance-grade measurement.
Free browser sound-level tool
Online Decibel Meter
Use your microphone to check current, minimum, average, maximum and recent peak estimated sound levels. Audio is analyzed locally and is never recorded or uploaded.
Microphone access starts only after you select Start Measurement.
- Minimum
- —dB
- Average
- —dB
- Maximum
- —dB
- Recent peak
- —dB
- Duration
- 00:00
Start a measurement to display recent estimated sound levels.
How to Check Sound Levels Online
Use the online decibel meter in a quiet, consistent position and measure for long enough to understand the sound—not just a brief spike.
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Prepare your device
Keep the microphone opening uncovered and close other apps that may already be using it.
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Start the meter
Select “Start Measurement.” Your browser will request microphone access only after this action.
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Allow microphone access
Choose the microphone you want to test. The audio is analyzed locally and is not recorded or uploaded.
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Measure for several seconds
Keep the device still and maintain the same distance and angle from the sound source.
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Review the results
Compare the current, average, maximum and peak estimated dB SPL before stopping the session.
Small changes in placement can produce different results.
- Keep the microphone opening clear.
- Use the same device, distance and angle when comparing sounds.
- Avoid wind, handling noise and movement during measurement.
- Watch the average instead of relying on one changing reading.
- Move farther from very loud sources to reduce microphone clipping.
What Your Sound-Level Result Means
The meter displays several estimated dB SPL values because sound changes from moment to moment. Reading them together gives you a clearer picture than relying on a single number.
- Minimum
- 51.2 dB
- Average
- 61.7 dB
- Maximum
- 72.4 dB
- Peak
- 76.1 dB
Longer sessions usually provide a more representative average.
Example values are shown for explanation and are not a live measurement.
- Current sound level What the microphone detects now
- The current reading follows the sound in real time. It rises and falls quickly, so use it to observe immediate changes rather than describe the entire measurement session.
- Minimum The lowest session reading
- Minimum shows the lowest estimated level detected since measurement began. A brief quiet pause can lower this value, so it may not represent the usual background level.
- Average The overall session level
- The energy-based average summarizes the measurement period. It is generally the most useful value for comparing steady environments measured with the same device and setup.
- Maximum The highest displayed level
- Maximum records the highest estimated sound level reached during the session. It helps reveal louder moments that may be hidden by a lower overall average.
- Peak A fast, short sound spike
- Peak reacts to brief transients such as a clap, knock or dropped object. It can be higher than the maximum displayed reading because short impulses happen very quickly.
- Session duration How long the meter has measured
- Duration provides context for the statistics. A longer session captures more variation and usually produces a more meaningful average than a reading lasting only one or two seconds.
New to sound measurements? Learn what a decibel is and how sound pressure level describes changes in acoustic pressure.
How Loud Are Everyday Sounds?
Compare your estimated reading with familiar sound environments. These examples are approximate because distance, surroundings and the sound source can significantly change the measured level.
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20 dBRustling leaves Very quiet natural sound
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30 dBSoft whisper Measured from nearby
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40 dBQuiet library Low background activity
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60 dBNormal conversation Typical speaking distance
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70 dBVacuum cleaner Varies by model and distance
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80 dBBusy traffic Observed near a roadway
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90 dBLawn mower Loud powered equipment
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100 dBMotorcycle Level depends heavily on distance
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110 dBLoud concert Can vary throughout the venue
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120 dBEmergency siren When heard at close range
Use these examples as general reference points. Actual sound levels can vary widely. This browser-based meter provides an estimate and should not replace calibrated equipment for occupational, legal, medical or regulatory measurements.
View the complete decibel chartHow to Get More Consistent Sound Readings
A few simple adjustments can make browser-based decibel comparisons more repeatable. Keep your device, position and surroundings consistent whenever you measure a sound.
Keep the device still
Place your phone, tablet or computer on a stable surface. Handling noise and sudden movement can create temporary spikes in the reading.
Best practice: use the same device orientation each time.Measure for enough time
Allow the meter to observe the sound for several seconds. Use the average reading for steady noise and the maximum reading for short events.
Best practice: repeat each test two or three times.Maintain the same distance
Sound level changes as you move closer to or farther from the source. Mark your measurement position when comparing multiple tests.
Best practice: record the approximate distance from the source.Check the background level
Measure the room before starting your main test. Fans, traffic, voices and ventilation systems can influence the final result.
Best practice: test in the quietest practical environment.Browser measurements are useful estimates
Consumer-device microphones are not standardized measurement instruments. Use this meter to observe trends and compare conditions—not as a replacement for a calibrated sound level meter when certified accuracy is required.
Learn More About Sound and Decibels
Explore practical guides, reference charts and measurement resources to better understand sound levels, hearing awareness and decibel readings.
Decibel Chart
Compare common sounds from quiet environments to loud machinery and see where they appear on the decibel scale.
What Is a Decibel?
Understand what decibels measure, why the scale is logarithmic and how dB values should be interpreted.
Safe Decibel Levels
Learn why both sound intensity and exposure duration matter when thinking about loud-noise environments.
Helpful sound measurement guides
Measure the Sound Around You
Use your device microphone to estimate the current sound level and observe minimum, average and maximum readings.
Sound Level Meter FAQs
Find clear answers about browser-based decibel measurements, microphone accuracy, sound levels and interpreting your results.
How accurate is an online decibel meter?
An online decibel meter can provide a useful estimate of the sound level around your device. Accuracy varies because consumer microphones, operating systems and automatic gain controls are not standardized. It is best suited to observing changes and comparing similar conditions.
How do I measure sound with this tool?
Open the sound meter, start the measurement and allow microphone access when your browser asks. Keep your device still, maintain a consistent distance from the sound source and measure for long enough to observe the minimum, average and maximum readings.
Can a phone measure decibels?
Yes, a phone can use its built-in microphone to estimate sound levels. Results may differ between phone models because of microphone hardware, audio processing and calibration. A professional sound level meter is more appropriate when certified or highly precise measurements are required.
What is a normal decibel level?
There is no single normal level because sound changes by location and activity. A quiet room may be around 30–40 dB, ordinary conversation is often near 60 dB and busy traffic can be considerably louder. These values are general references rather than fixed limits.
Why does the decibel reading keep changing?
Real-world sound continuously changes. Voices, movement, reflections, background noise and the distance from the source can all affect the reading. The live value shows current variation, while minimum, average and maximum values provide a more complete view.
What is the difference between dB and dBA?
dB is a general unit expressing a logarithmic ratio. dBA refers to a frequency-weighted measurement designed to approximate how human hearing responds to different frequencies. Professional noise and workplace guidance commonly uses A-weighted values.
At what decibel level can sound become harmful?
Hearing risk depends on both sound intensity and exposure duration. As a sound becomes louder, the recommended exposure time generally becomes shorter. Use official workplace or public-health guidance when evaluating hearing risk rather than relying only on a browser reading.
How can I get more consistent measurements?
Use the same device, microphone position, distance and test duration each time. Avoid covering the microphone and reduce unrelated background noise. Repeating the measurement can help reveal whether a result is consistent or caused by a temporary sound.
Ready to Measure the Sound Around You?
Start the browser-based sound meter to observe the current noise level and track minimum, average and maximum readings in real time.