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Online Sound Meter

Measure ambient sound level using your phone or computer microphone.

SOUND LEVEL
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dB
Meter not started
30 60 90 120 dB
Start the meter and allow microphone access.
MIN
—
AVG
—
MAX
—
TIME
00:00
Typical Sound Level Reference
< 40 dB Very quiet room
40–54 dB Quiet office or library
55–69 dB Normal conversation
70–84 dB Busy traffic or vacuum cleaner
85–99 dB Loud machinery or power tools
100–114 dB Very loud music or event
115+ dB Extremely loud sound
Approximate examples only. Actual sound levels vary with the source, distance and surroundings.
Calibration
For better accuracy, compare this device with a calibrated sound level meter under a steady sound and enter the reference reading below.
Enter the dB reading shown by the reference instrument.
Calibration offset: 0.0 dB
Recorded Measurements
How the Sound Meter Works

The tool accesses the microphone through your browser and measures the root-mean-square amplitude of the incoming audio signal. The signal is converted to a decibel estimate and smoothed to provide a more stable live reading.

Where supported, echo cancellation, noise suppression and automatic gain control are requested to be disabled so that browser processing interferes less with the measurement.

Phone and computer microphones differ in sensitivity and may still apply hardware or operating-system processing. Browsers do not provide a universal acoustic calibration, so uncalibrated values are estimates. Calibration against a reference sound level meter can improve agreement for the same device and microphone.

This tool is intended for indicative and educational sound measurements. Regulatory, occupational and compliance measurements should be performed with an appropriately calibrated sound level meter using the required frequency weighting, time weighting and measurement procedure.