LUFS Meter (Loudness Meter)
A loudness meter that applies K-weighting to your microphone and shows momentary (400 ms), short-term (3 s) and integrated loudness in LUFS-style units.
ℹ Approximate and relative — not a certified loudness measurement. A browser mic is uncalibrated and the OS may apply automatic gain, this meter is mono / single-channel, and the gating is simplified. Use it to watch loudness change and compare momentary vs short-term — not to certify a file to a spec. For compliant LUFS (ITU-R BS.1770 / EBU R128), measure the file in a proper meter. Nothing is recorded or uploaded.
Microphone
Loudness
What LUFS Means
LUFS (Loudness Units relative to Full Scale) estimates how loud audio sounds to people, not just its raw level. It applies K-weighting — a high-pass plus a high-frequency shelf that mimics the ear’s sensitivity — then measures the mean square energy. Momentary uses a 400 ms window, short-term a 3 s window, and integrated averages the whole program with gating to ignore silence.
This meter implements that idea with real K-weighting filters, but it reads your microphone, which is uncalibrated, mono, and subject to the system’s automatic gain. So the numbers are a useful relative guide — great for seeing loudness rise and fall, or comparing two sources in the same setup — but they are not a certified file measurement.
Why it’s not a substitute for a file meter
Compliant LUFS (for streaming or broadcast) is measured on the actual audio file with calibrated, multi-channel, fully-gated metering. A live mic adds room acoustics, mic response, distance and AGC — none of which belong in a loudness spec. Treat this as a learning and monitoring tool, and measure files in a dedicated meter for real numbers.