Decibel Meter
Online Decibel Meter
Measure how loud your environment is in decibels — a free online sound level meter that runs live in your browser using your microphone.
—dB
approx. relative level
Approximate relative level (dBFS-based), not a calibrated SPL reading. Audio stays in your browser.
Measuring sound level in your browser
Press Start Microphone and the meter shows a live decibel reading plus the loudest peak of the session. Because browsers only expose relative audio levels, this is an approximate sound level meter — perfect for comparing rooms, checking noise, or demonstrating how loud something is, but not a calibrated SPL instrument.
Curious about a specific frequency or note in the noise? Pair this with the pitch detector or the tone generator.