FREE · DEVICE TESTS
Sound Level Meter (Decibels).
Measure the noise level around you with your microphone, with live, maximum and average decibels, a history graph and a calibration offset.
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- Maximum
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- Average
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An estimate, not a certified sound level meter: phone and laptop microphones and their automatic processing vary a lot. Calibrate by adjusting the offset until the reading matches a real meter. The sound is analysed in your browser and never recorded or sent.
How to use Sound Level Meter (Decibels)
Press “Start microphone” and allow access. Adjust the offset to match a real sound level meter if you have one.
How it works
The microphone signal is analysed in the browser: the RMS level in dB relative to full scale plus the calibration offset; echo cancellation and automatic gain are turned off when possible.
Example
A quiet office reads around 40–50 dB and a busy street 70–80 dB after calibration.
Questions about Sound Level Meter (Decibels)
Is Sound Level Meter (Decibels) free, and do I need an account?
Yes. This tool is free to use in your browser without an account. Processing takes place on your device.
What are the limits and what should I check?
An estimate, not a certified meter: device microphones and their processing vary. Everything is calculated in your browser; nothing you type is uploaded. Review the result before using it in your work.
Is my input sent to a server?
Your input is processed in your browser and is not uploaded by this tool. Files and pasted text are cleared when the page is refreshed. Normal website requests are still required to load the page and its libraries. Read the privacy explanation.