LUFS stands for Loudness Units relative to Full Scale. It is the standard unit for measuring perceived audio loudness, defined by the ITU-R BS.1770 standard. Streaming platforms like Spotify (-14 LUFS), Apple Music (-16 LUFS), and YouTube (-14 LUFS) normalise all audio to a target LUFS level — if your track is louder it will be turned down; if quieter it may be turned up.

What is the difference between integrated, momentary, and short-term LUFS?

Integrated LUFS is the overall loudness of the entire file, measured with absolute (-70 LKFS) and relative (-10 LU) gating to exclude silence. Momentary LUFS is the loudness of any 400 ms window — shows peaks in your mix. Short-term LUFS is the loudness of any 3-second window — useful for identifying loud sections.

What is true peak (dBTP)?

True peak (dBTP) measures the actual maximum sample value in the audio. Most platforms require true peak to stay below -1 dBTP to prevent inter-sample clipping during lossy encoding. Our meter shows the peak sample level as an approximation of true peak.

What is Loudness Range (LRA)?

Loudness Range (LRA) measures the dynamic variation in a piece of audio, expressed in Loudness Units (LU). It is the spread between the 10th and 95th percentiles of gated short-term loudness blocks. A low LRA (0–5 LU) indicates heavily compressed audio; a high LRA (10+ LU) indicates wide dynamics.

Is my audio file uploaded to a server?

No. All analysis is performed entirely in your browser using the Web Audio API and JavaScript. Your audio file never leaves your device.

Which platforms use LUFS normalisation?

Spotify targets -14 LUFS, Apple Music -16 LUFS, YouTube -14 LUFS, Tidal -14 LUFS, Amazon Music -14 LUFS, Netflix -27 LUFS (dialogue), and broadcast uses EBU R128 at -23 LUFS. Our platform comparison table shows the exact difference between your mix and each target.

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Implements ITU-R BS.1770-4 K-weighting filters and gating. Results match professional DAW loudness meters.

Loudness Measurements

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LUFS Meter

Our free LUFS Meter implements the ITU-R BS.1770-4 standard to measure integrated loudness, momentary and short-term peaks, true peak (dBTP), and loudness range (LRA) for any audio file — and compares your mix against Spotify, Apple Music, YouTube, Netflix, and EBU R128 targets, all processed locally in your browser.

Who Is It For?

Music Producers & Mixing Engineers

Checking final masters against streaming platform loudness targets (-14 LUFS for Spotify/YouTube, -16 LUFS for Apple Music) before delivery to avoid automatic gain reduction.

Mastering Engineers

Verifying that delivered masters meet client loudness specifications and platform normalization targets, including true peak limits and LRA requirements.

Podcast & Voice-Over Producers

Ensuring speech audio meets broadcast dialogue standards (-23 LUFS for broadcast, -16 LUFS for podcasts) for consistent playback across listening environments.

Video & Film Post-Production

Checking dialogue and music loudness against Netflix (-27 LUFS) or broadcast EBU R128 (-23 LUFS) delivery specifications.

Independent Artists & Bedroom Producers

Getting professional loudness analysis without expensive metering plugins — understanding whether a mix is too hot or too quiet for streaming before release.

How It Works

Upload any audio file and click "Measure loudness". The tool implements the full ITU-R BS.1770-4 pipeline in your browser: it applies a two-stage K-weighting filter (a high-shelf pre-filter at ~1682 Hz and a high-pass filter at ~38 Hz) to each channel, computes mean square power in overlapping 400 ms blocks, applies an absolute gate at -70 LKFS and a relative gate at -10 LU below the ungated mean, then calculates integrated loudness. Short-term and momentary peaks are derived from 3 s and 400 ms blocks respectively.

Features

Full ITU-R BS.1770-4 K-weighting filter implementation
Integrated loudness (LUFS) with absolute and relative gating
Momentary peak LUFS (max 400 ms block)
Short-term peak LUFS (max 3 s block)
True peak approximation (dBTP)
Loudness Range (LRA) — 10th–95th percentile spread
Platform comparison table: Spotify, Apple Music, YouTube, Tidal, Amazon Music, SoundCloud, Netflix, EBU R128
100% browser-based — your audio never leaves your device

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