This online dB sound tester measures the microphone’s digital signal level in dBFS. It helps compare input gain, quiet passages, and peaks within the same setup. It does not measure calibrated dB SPL or dBA room loudness, so it cannot determine hearing safety, workplace exposure, or legal noise compliance.
Start with your device volume low. 50% here does not guarantee a safe listening level.
Ready when you are. Choose a test to begin.
03 / HEAR YOURSELF CLEARLY
Microphone and dB sound tester
Get call-ready for Zoom, Teams, or your next big conversation.
No audio uploads
Permission is requested only when you enable the microphone.
LIVE INPUT LEVEL
—dBFS
−90−60−300 dBFS
Peak hold: —
YOUR VOICE, VISUALIZEDSpeak naturally. Look for a clear, moving waveform.
What does my voice sound like?
Record 5 seconds, then listen back. Kept only in this tab’s memory.
This is a digital level meter (dBFS), not calibrated room loudness (dB SPL). Automatic gain and microphone processing can affect readings.
A SIMPLE START
How to run this audio check
01
Choose and position the microphone
Enable access and select one input. Keep the microphone at a consistent distance and orientation for every comparison.
02
Compare quiet and normal speech
Pause briefly, then speak naturally. Watch the live level and held peak; avoid changing gain between readings you intend to compare.
03
Listen before deciding
Record and replay five seconds. If louder words sound harsh or flattened, lower input gain and repeat. Reset peak hold between trials.
dBFS, dB SPL, and dBA are different references
dBFS expresses signal amplitude relative to digital full scale. Values below that reference are normally negative, and values nearer zero indicate a stronger captured signal. dB SPL instead refers to physical sound pressure; dBA applies a frequency weighting to an acoustic measurement. A browser’s uncalibrated mic input does not supply the information needed to substitute one for another.
Changing microphone gain can change the displayed number while the room sound stays the same. Different microphones can produce different readings in the same location. That makes this tool useful for relative checks on one setup, but unsuitable for comparing environmental noise levels across unrelated devices.
How the live level and peak hold are calculated
The application reads short blocks of time-domain samples from the browser’s audio analyser. It calculates an RMS amplitude for the live reading using 20 × log10(RMS), and holds the largest sampled peak separately. The display has a lower floor so silence does not produce an unreadable negative infinity value.
The live average and peak are intentionally different: a short transient can produce a high peak while the average remains lower. The peak-hold control resets that history for a new comparison. This is a description of this application’s calculation, not a calibrated measurement standard or a universal target for voice recording.
Use the result to adjust a microphone
Read the meter alongside a listening check. A stronger number is not always better: increasing gain also raises unwanted sound and can leave less headroom. Start from normal speaking distance, reduce obvious overload, and compare intelligibility in the short recording. There is no single ideal value for every voice, mic, or application.
Automatic gain control and other processing can influence input even when the browser requests unprocessed capture. For a call, check the same microphone in the meeting app after adjusting it. For a workplace, medical, or environmental measurement, use an appropriate calibrated instrument and the required procedure instead of this browser meter.
What your result may mean
A listening clue is a starting point, not a diagnosis.
Common observations and practical next checks
What you notice
Possible explanation
Next check
Reading changes after gain adjustment
Digital input sensitivity changed; the room may be unchanged.
Keep gain fixed for a relative before/after comparison.
Peak is much higher than live level
A brief transient exceeded the recent average.
Reset peak and repeat a normal sentence.
Different phones show different values
Mic hardware and processing are not calibrated to one reference.
Do not compare these readings as room dB SPL.
Sources & technical references
The tool behavior described here reflects this website’s implementation. These primary references explain relevant browser capabilities or equipment and application settings.
Can this online dB tester measure room noise accurately?+
It measures the captured digital signal in dBFS, not calibrated acoustic loudness. Microphone sensitivity, gain, placement, and processing affect the number. Use it to compare changes within one unchanged setup. For room noise in dB SPL or dBA, use a calibrated instrument and an appropriate measurement method.
Why are the microphone dB readings negative?+
The reference is digital full scale, represented by 0 dBFS. Signals below that reference are expressed as negative values; this does not mean negative physical sound pressure. A value closer to zero indicates a stronger digital signal. The meter’s lower display floor represents very low input, not a calibrated silent room.
What microphone dB level should I aim for?+
There is no universal target for every microphone, voice, and app. Speak naturally, leave room for louder words, and listen to the recording for clarity and overload. If peaks sound harsh, reduce input gain. A meeting app may process the input differently, so repeat its own check afterward.
Is this an OSHA or NIOSH noise measurement tool?+
No. It is an informational browser meter without acoustic calibration, exposure measurement, or certified instrumentation. It cannot establish workplace compliance or safe hearing exposure. Do not use its dBFS values as dBA sound levels. Use the appropriate professional instrument and assessment procedure for those decisions.