Decibel Meter

Reference meter: Use your microphone to compare room noise, PC fan noise, call background noise, or music loudness. Browser readings are relative until calibrated against a real sound level meter.

Live sound level

Ready

dB relative

Start the meter and allow microphone access.

Audio is analyzed locally in your browser and is not uploaded.

Min--

Avg / Leq--

Max--

Peak--

5s avg--

Elapsed00:00

Level history

Last 60 seconds

Frequency spectrum

Low to high frequency

Calibration and advanced options

Offset (dB)

Reference dB

Use a real SPL meter or trusted reference source, then adjust the offset until both readings match. The offset is stored only in this browser.

Quick reference

30-40 dBquiet room

50-60 dBconversation

70-80 dBtraffic or vacuum

85+ dBlimit long exposure