Sound Level Meter

Measure noise in decibels with your microphone: A, C or Z weighting, Leq, max and peak, your daily noise dose, and a night log of each loud sound with its recording

Weighting

A C Z

Response

Fast Slow

What the microphone hears is measured in your browser, never sent.

Level

– dB(A)

Press Start measuring

Not calibrated: off by 10 dB or more

–

Average ()

–

Max ()

–

Min ()

–

Background ()

–

Peak ()

–

Measured for

History

1 min 10 min 1 h All

Noise log

Log sounds over

dB(A)

Between 0 and 140 dB.

Keep a recording of each, from 2 s before

Leave the page open, through a night for instance: each sound over the threshold is listed with its time, length and level. Download gives a ZIP of the report, the levels second by second and the recordings. It all stays in this page: closing it loses the log.

No sound over the threshold yet.

Hearing

–

Daily noise dose

–

Last minute (LAeq)

–

Full dose at this level in

NIOSH's limit: 85 dB(A) for 8 hours a day, half as long for every 3 dB more (91 dB(A): 2 hours, 100 dB(A): 15 minutes). Counted in dB(A), Slow, over what this page measured; levels under 80 dB(A) don't count.

Calibration

A browser only gets the microphone's level relative to the loudest it can take, not decibels. Until it is calibrated, this page assumes a typical phone microphone: each one differs, by 10 dB or more.

Match a sound level meter

dB(A)

Put this device next to a calibrated meter, both on Slow and the same weighting, make a steady sound (a fan, a running tap), measure here, then type the meter's reading.

Correction for this microphone

Added to every level, past ones too, and kept in this browser for this microphone. It holds while the system's input volume stays the same.