Why LUFS Replaced Peak dBFS
Before LUFS, engineers measured loudness using peak dBFS (decibels relative to full scale). The problem: peak meters measure the highest momentary amplitude, not how loud something actually sounds. A heavily compressed track and a dynamic orchestral piece can have identical peak levels but sound completely different in perceived loudness.
This led to the Loudness War — a decades-long race where mastering engineers kept pushing louder and louder masters to stand out on playlists and radio. The result was heavily compressed, fatiguing music with crushed dynamics.
LUFS solves this by measuring how loud audio sounds to a human listener, using a psychoacoustic model that weights different frequency ranges according to how our ears perceive them.
How LUFS Is Measured
LUFS measurement follows the ITU-R BS.1770-4 standard, which defines a two-stage signal processing chain:
- K-weighting filter — A high-shelf pre-filter at ~1500 Hz (+4 dB) followed by a high-pass filter at ~38 Hz. This models the frequency sensitivity of human hearing.
- Gated integration — The filtered signal is measured in 400ms blocks with 75% overlap. Blocks below −70 LUFS are gated out (ignored), so silence doesn't drag down the average. The remaining blocks are averaged to give the integrated loudness.
Key insight: LUFS is a psychoacoustic measurement. It approximates how loud something sounds to a human, not just how high the waveform peaks.
The Four LUFS Measurements
When working with a LUFS meter, you'll see up to four different readings:
- Integrated LUFS — The average loudness of the entire file, gated to ignore silence. This is what streaming platforms use for normalization.
- Short-term LUFS — Average loudness over the last 3 seconds. Useful for identifying loud sections in a mix.
- Momentary LUFS — Average over the last 400ms. Shows instantaneous loudness level.
- True Peak (dBTP) — The actual peak level after inter-sample reconstruction, accounting for peaks that may exceed 0 dBFS after D/A conversion. Most platforms recommend a true peak ceiling of −1 dBTP or lower.
Platform Loudness Standards
Every major streaming platform normalizes audio to a target LUFS level. If your track is louder than the target, it gets turned down. If it's quieter, it plays as-is (most platforms don't turn quiet tracks up).
| Platform | Integrated LUFS Target | True Peak |
|---|---|---|
| YouTube | −14 LUFS | −1 dBTP |
| Spotify | −14 LUFS | −1 dBTP |
| Apple Music | −16 LUFS | −1 dBTP |
| Podcast (standard) | −16 LUFS | −1 dBTP |
| Broadcast (EBU R128) | −23 LUFS | −1 dBTP |
What LUFS Value Should You Target?
For most music released on streaming platforms, targeting −14 LUFS integrated is a safe starting point. This matches YouTube and Spotify's normalization target, meaning your track plays at roughly the intended level without being turned down.
However, louder genres like EDM, hip-hop, and pop often master to −8 to −10 LUFS — knowing that the platform will turn it down to −14, but the track will still have the compressed, punchy character the genre expects.
For podcasts and spoken word, −16 LUFS is the industry standard, matching Apple Podcasts and most podcast apps.
Common LUFS Mistakes
- Mastering too loud thinking it'll sound better — It won't. Streaming platforms normalize it down, and you lose dynamic range for no benefit.
- Confusing peak dBFS with LUFS — A track at −0.1 dBFS peak can still measure −14 LUFS integrated. They're different measurements.
- Not checking true peak — Values above −1 dBTP can cause distortion on some decoders, even if integrated LUFS looks fine.
- Measuring a loop instead of the full track — Integrated LUFS is calculated over the entire file. Always measure the full render, not just the chorus.
How to Check Your LUFS for Free
You don't need a DAW plugin or desktop software. AudioLab measures integrated LUFS directly in your browser using the full ITU-R BS.1770-4 K-weighting algorithm. Drop your audio file, and you'll see integrated LUFS, peak dBFS, true peak, dynamic range, and a comparison against all major platform targets — all without uploading your file anywhere.