Open-plan office
- Input
- Leq 58 dB(A)
- Expected output
- Sem limite de tempo pela NR-15
Below 85 dB(A) the standard sets no maximum exposure time.
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how to measure noise level at work
Occupational noise is measured under specific rules: A weighting, slow response, and a reading taken near the worker ear. A phone can reproduce that configuration and compare the result against the tolerance limit table of Brazil NR-15.
Below 85 dB(A) the standard sets no maximum exposure time.
An 8-hour shift at that level would give a dose of roughly 267 % of the limit.
As a comparison, yes; as an absolute value, not without calibration. Phone microphones respond reasonably well across the speech range and clearly show that one room is noisier than another. What they lack is a certified reference: each model saturates at a different level, so the absolute number can be off by 5 to 10 dB. They also tend to clip before 110 dB, which underestimates very loud environments.
No. Hazardous-work classification, technical reports and early-retirement claims require an instrument with traceable calibration, a standardised procedure and a legally qualified professional, usually with a dosimeter worn by the worker through the entire shift. This tool is for noticing that a problem exists so you can find someone able to measure it formally.
Because echo cancellation, noise suppression and automatic gain control exist precisely to rewrite the amplitude of the signal and make voices clearer on a call. With them on, the meter measures the algorithm rather than the room. The tool disables all three automatically when requesting microphone access.
Tap to turn on the microphone. Audio is analysed live on your device: it is never recorded or uploaded.
A weighting mimics the ear reduced sensitivity to low frequencies and is required by every occupational noise standard, Brazil's NR-15 included.
A phone microphone is not a certified instrument and each model saturates at a different level, so the absolute value depends on this adjustment. If you have access to a real sound level meter, place both next to a constant source and move the slider until the numbers agree. Without that, treat the reading as relative: it compares rooms well, but the absolute value can be off by 5 to 10 dB.
This tool is educational and does not replace a calibrated sound level meter. No reading here is valid for a technical report, expert evidence, legal proceedings, hazardous-work classification or early-retirement claims, all of which require an instrument with traceable calibration and a qualified professional.
Audio is analysed live inside the browser and discarded frame by frame. Nothing is recorded, nothing is saved, and no sound leaves your device.