Loudness (LUFS) Calculator

dBFS (decibels relative to Full Scale) is a level measurement for instantaneous signal amplitude — it measures a single sample's level or peak level. LUFS (Loudness Units relative to Full Scale) is a time-integrated perceptual loudness measurement that accounts for how human hearing perceives different frequencies over time. A song with peaks at -1 dBFS and a LUFS of -8 is extremely loud and compressed. A symphony with peaks at -1 dBFS and a LUFS of -23 has tremendous dynamic range. The dBFS peak tells you about clipping risk; the LUFS tells you about perceived loudness and streaming normalization behavior.

Loudness Range (LRA) is a statistical measure of the loudness variation within a program, expressed in Loudness Units (LU). It compares the short-term loudness of loud passages versus quiet passages using a gated, statistical method. For music, an LRA of 4–8 LU is typical for pop and rock (relatively consistent loudness). 8–14 LU is typical for indie, folk, and jazz (more dynamic variation). 14–20+ LU is typical for classical music, film scores, and highly dynamic music. A very high LRA (above 20 LU) may indicate inconsistent mastering or extreme dynamic range that causes normalization to pump noticeably on streaming platforms.

Industry best practice is to master to the most transparent target and let platforms handle normalization. Mastering to -14 LUFS with a true peak of -1 dBTP satisfies Spotify, YouTube, Amazon, and Tidal simultaneously without platform-specific adjustments. Apple Music targets -16 LUFS — if mastering for Apple specifically, a -16 LUFS target preserves more dynamic range. Creating separate masters for each platform is an option (some mastering houses offer platform-optimized masters), but most artists and engineers find that a single well-mastered -14 LUFS, -1 dBTP master performs excellently across all platforms.

EBU R128 (European Broadcasting Union Recommendation R 128) is the European broadcast loudness standard that mandates audio programs must target -23 LUFS integrated loudness with a maximum true peak of -1 dBTP and a loudness range within the appropriate genre guidelines. Adopted by European broadcasters in 2011, EBU R128 ended the loudness wars in broadcast TV by imposing normalization on all broadcast content. The ATSC A/85 standard in the United States and the ITU-R BS.1770 international standard set similar requirements. Film and game audio typically also targets EBU R128 or similar loudness-normalized delivery specifications.

A LUFS meter is a loudness measurement tool that implements the BS.1770/LUFS algorithm, displaying Integrated LUFS, Momentary LUFS, Short-Term LUFS, Loudness Range (LRA), and True Peak measurements. Free and affordable options include: Youlean Loudness Meter (free, plugin and standalone), iZotope Insight (included in RX bundles), Nugen Audio VisLM, Waves WLM Plus, and TC Electronic LM6. Pro Tools and Logic Pro both have built-in loudness meters that support LUFS measurement. Every mastering engineer should have a BS.1770-compliant LUFS meter on the master bus as a final check before delivery.

No, on platforms with loudness normalization. Since Spotify, Apple Music, YouTube, and Amazon all normalize loudness, a louder master sounds identical in volume to a properly mastered -14 LUFS release after normalization. The only effect of making masters excessively loud (below -10 LUFS) is damaging the dynamic range without gaining any competitive advantage. Research published in journals including the JAES has confirmed that listeners prefer more dynamic masters when volume is controlled, and that the heavy limiting characteristic of loudness-war-era masters reduces listener enjoyment.

Integrated LUFS (LI) is the average loudness measured over the entire program duration, using BS.1770 gating that excludes periods of silence or very low-level content. This is the primary value used for streaming normalization. Short-term LUFS (LS) measures loudness over a 3-second sliding window and shows dynamic fluctuations through the program — a useful view of how loud each section of the song is. Momentary LUFS (LM) measures over a 400ms window, reflecting near-instantaneous loudness changes. When targeting streaming platforms, the Integrated LUFS number is what matters.

The podcast industry has converged on -16 LUFS integrated loudness as the standard target for speech-dominated content, based on Apple Podcasts' original recommendation. Many platforms including Spotify for Podcasters, Anchor, and Buzzsprout also recommend -16 LUFS. Some podcasters target -14 LUFS (more aggressive, matches music streaming targets), while others target -19 LUFS (closer to broadcast speech standards). The practical recommendation is -16 LUFS ± 1 LU integrated, with peaks no higher than -3 dBFS (true peak -1 dBTP for platform submission).