LUFS stands for Loudness Units relative to Full Scale — the industry-standard measurement for perceived loudness in audio. Every major streaming platform uses LUFS to normalise tracks so nothing blasts your ears or whispers into nothing. If you're mixing, mastering, or exporting audio for any platform, LUFS is the number you need to hit. Here's what it means, how the three measurement types work, and exactly what to target for every platform.
What Does LUFS Mean?
LUFS measures how loud audio feels — not how loud the signal peak is. That distinction matters.
Full form: Loudness Units relative to Full Scale
When you look at a waveform and see a tall spike, that's peak amplitude — measured in dBFS (decibels relative to full scale). LUFS ignores momentary spikes and instead integrates loudness over time, weighted for how human hearing actually works. The result is a number that correlates with perceived volume far better than peak metering ever did.
The weighting filter used is called K-weighting: it boosts sensitivity around vocal frequencies (roughly 1–5 kHz, where our ears are most sensitive) and rolls off the low bass, which feels loud on a meter but doesn't register as loud to our ears.
Why is LUFS always a negative number?
This trips up almost every beginner: LUFS values are always negative (e.g. −14 LUFS, −23 LUFS), and a number closer to zero is louder, not quieter.
The reason: 0 LUFS represents the loudest possible digital signal — full scale, the point of clipping. All real-world audio sits below that ceiling, so the measurement is always negative. Think of it like temperature below zero: −14°C is warmer than −23°C. In the same way, −14 LUFS is louder than −16 LUFS.
So when Spotify says "normalise to −14 LUFS", that means your integrated loudness should sit 14 loudness units below the digital ceiling — not quiet, but not slamming the ceiling either.
LUFS vs dBFS vs RMS — What's the Difference?
| Metric | What it measures | When to use it |
|---|---|---|
| dBFS | Peak amplitude of the signal | Gain staging, avoiding digital clipping |
| RMS | Average energy over time (unweighted) | Legacy broadcast standard — still in older specs |
| LUFS | Perceived loudness (K-weighted, time-integrated) | Streaming delivery targets, mastering reference |
dBFS tells you where your loudest moment is — useful for headroom checks. It doesn't tell you how loud the track feels over time.
RMS is a better approximation of perceived loudness than dBFS, but it's unweighted — it treats a 60 Hz rumble the same as a 3 kHz vocal, even though our ears don't. LUFS replaced RMS as the mastering reference for exactly this reason.
LUFS is what streaming platforms actually use for normalisation. It's the number to hit on delivery.
Integrated, Short-Term, and Momentary LUFS — What Each One Means
A loudness meter shows three LUFS readings simultaneously. They're not interchangeable:
Integrated LUFS — the average loudness across the entire file from start to finish. This is your delivery target. When Spotify says "−14 LUFS", they mean your integrated reading. Export, measure, hit this number.
Short-term LUFS — a rolling 3-second window. Updates continuously during playback. Useful while mixing to spot sections that are significantly louder or quieter than the rest of the track — a bridge that's too hot, a verse that drops off.
Momentary LUFS — a rolling 400ms window. Reacts fastest of the three, useful for catching loud transients in real time. Not your delivery metric, but handy for dynamics monitoring.
True Peak (dBTP) — technically separate from LUFS, but always checked alongside it. True Peak catches inter-sample peaks that dBFS can miss — spikes that only appear after digital-to-analogue conversion. Keep True Peak below −1 dBTP on all streaming platforms (−2 dBTP on some broadcast specs).
Workflow rule: Use Integrated LUFS for your delivery target. Use Short-term to balance sections during mixing. Check True Peak before every export.
LUFS Targets for Every Platform (2026)
Use this table when mastering for delivery. If your integrated LUFS is louder than the platform target, the platform will turn you down automatically. If it's quieter, some platforms will turn you up (Spotify, YouTube), others won't (Apple Music on some settings).
| Platform | Integrated LUFS | True Peak |
|---|---|---|
| Spotify | −14 LUFS | −1 dBTP |
| YouTube | −14 LUFS | −1 dBTP |
| Apple Music | −16 LUFS | −1 dBTP |
| Amazon Music | −14 LUFS | −2 dBTP |
| Tidal | −14 LUFS | −1 dBTP |
| TikTok | −14 LUFS | −1 dBTP |
| Podcast (general) | −16 LUFS | −1 dBTP |
| Netflix | −27 LKFS | −2 dBTP |
| EBU R128 (broadcast EU) | −23 LUFS | −1 dBTP |
| ATSC A/85 (US broadcast) | −24 LKFS | −2 dBTP |
Note on LKFS: LKFS (Loudness, K-weighted, relative to Full Scale) and LUFS are numerically identical — they measure exactly the same thing using the same ITU-R BS.1770 algorithm. LKFS is the term used in broadcast (Netflix, ATSC), LUFS is used in streaming. If a spec says −27 LKFS, that equals −27 LUFS.
Podcast targets: Most podcast apps (Spotify Podcasts, Apple Podcasts, Pocket Casts) target around −16 LUFS for speech content — 2 LU quieter than music streaming. Speech intelligibility benefits from the slightly lower target because there's less mastering compression pushing the level up.
Use the LUFS calculator to check how your current reading compares to any platform target.
How to Check and Hit Your LUFS Target
The workflow is the same regardless of your DAW:
- Finish your mix. Don't touch the master output gain yet.
- Run a loudness analysis on the full export (most DAWs include a loudness meter; free standalone options: Youlean Loudness Meter, LUFS Meter by Klangfreund).
- Note your Integrated LUFS and True Peak readings.
- Compare to the target for your platform (table above).
- Adjust your master output gain by the difference. If you're at −11 LUFS and need −14, pull the master down 3 dB.
- Re-export and verify — run the analysis again on the final file.
One thing to avoid: don't chase LUFS by slamming a limiter harder. Aggressive limiting to hit a target destroys dynamics. Instead, adjust the gain at the master output after your limiter — you're moving the level, not the dynamics.
If a track is significantly louder than the target (say, −8 LUFS mastered hot for CD), most platforms will simply turn it down automatically. Your loud master doesn't arrive louder — it arrives at the same perceived level as everything else, just with worse dynamics than something mastered at −14 from the start.
FAQ
What does LUFS stand for? LUFS stands for Loudness Units relative to Full Scale. It's the standard measurement for perceived loudness in digital audio, used by all major streaming platforms for normalisation.
Why is LUFS always a negative number? Because 0 LUFS represents the loudest possible digital signal — the clipping point. All real audio sits below that ceiling, so measurements are always negative. A number closer to zero means louder: −14 LUFS is louder than −16 LUFS.
What's the difference between LUFS and dBFS? dBFS measures the peak amplitude of the signal — the tallest spike in your waveform. LUFS measures perceived loudness over time using a frequency-weighted average. dBFS is for checking headroom; LUFS is for mastering and delivery targets.
What LUFS should I use for Spotify? Target −14 LUFS integrated with a True Peak of −1 dBTP. Spotify normalises all tracks to −14 LUFS — if your track is louder, it gets turned down; if quieter, it gets turned up.
What LUFS should I target for a podcast? Most podcast platforms target −16 LUFS for speech content. That's 2 LU quieter than music streaming — speech benefits from the extra headroom and doesn't need the same loudness compression that music does.
What is True Peak and how does it relate to LUFS? True Peak (dBTP) measures inter-sample peaks — spikes that can appear between digital samples after D/A conversion, which standard dBFS metering misses. Keep True Peak below −1 dBTP for streaming and −2 dBTP for broadcast. Always check it alongside your LUFS reading before delivery.
Are LKFS and LUFS the same thing? Yes — numerically identical. Both use the ITU-R BS.1770 algorithm and K-weighting. LKFS is the term used in broadcast standards (Netflix, ATSC A/85), LUFS is used in streaming contexts. If a spec says −27 LKFS, that's the same as −27 LUFS.
