What Is LUFS? Loudness Units Explained for Music Producers

6 min read

If you've uploaded a track to Spotify and noticed it sounds quieter than other songs, LUFS is why. Every major streaming platform now normalizes audio to a target loudness — and if your track is louder than the target, they turn it down.

What are LUFS?

LUFS (Loudness Units Full Scale) measure perceived loudness, not peak level. Unlike dBFS which measures the highest sample, LUFS measure how loud the track sounds to the human ear across its entire duration.

Key difference: two tracks can both peak at -0.1 dBFS but have very different LUFS. A heavily compressed EDM track might hit -6 LUFS while a dynamic jazz recording sits at -18 LUFS — both peaking at the same level.

Integrated vs Short-term vs Momentary LUFS

• Integrated LUFS — the average loudness of the entire track. This is the number streaming platforms care about.
• Short-term LUFS — average over 3-second windows. Useful for seeing variation during the track.
• Momentary LUFS — average over 0.4 seconds. Shows instant loudness changes.

When people say "my track is -14 LUFS," they mean the integrated measurement.

Streaming platform targets

Every major platform normalizes your track to a target LUFS. If your mix is louder than the target, they turn it down. If it's quieter, some platforms turn it up (but not all).

What happens if you exceed the target?

If your track is -8 LUFS and you upload to Spotify (-14 target), Spotify turns your track down by 6dB. You lose loudness and dynamic range — because you already crushed it to get to -8. The result: your track sounds quieter and worse than a mix that was delivered at -14 naturally.

This is why "louder is better" no longer works on streaming. The platform normalizes everything to the same loudness. What matters now is dynamic range and clarity, not raw level.

What about true peak?

True peak (measured in dBTP) is different from sample peak. Inter-sample peaks can occur between samples during DAC reconstruction and cause clipping even when your sample peaks don't hit 0. Streaming platforms recommend -1.0 dBTP to avoid any clipping after their encoding.

How to measure LUFS

You can measure LUFS with:

• MixDiagnose — free, no signup, upload any track
• YouLean Loudness Meter (plugin)
• fab-filter Pro-L 2 (limiter with LUFS readout)
• iZotope Insight (analysis suite)
• ffmpeg ebur128 filter (command line)

Should you master to -14 LUFS?

Not necessarily. Many mastering engineers aim for -9 to -10 LUFS for genres that need loudness (EDM, hip hop, metal) and accept that streaming will turn them down. The reasoning: the track sounds better at full loudness on non-normalized playback (SoundCloud, Bandcamp, clubs).

But for most producers, targeting -14 LUFS means:

1. Your track won't be turned down by streaming platforms
2. You preserve dynamic range
3. Your mix translates better across all playback systems

The bottom line

LUFS measure perceived loudness. Streaming platforms normalize to -14 (Spotify/YouTube) or -16 (Apple Music). If your mix is louder than the target, it gets turned down — and you've wasted dynamic range achieving loudness that gets removed anyway. Target -14 LUFS, keep true peak below -1.0 dBTP, and preserve dynamics.

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