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Integrated LUFS
A gated measurement intended to represent overall program loudness across the analyzed track.
Check the loudness of your song directly in the browser. Measure Integrated LUFS, Short-Term LUFS, estimated True Peak and Loudness Range from an audio file — without reducing your master to a single arbitrary “ideal” streaming number.
Load a song, mix or master. The analyzer decodes the file in your browser, applies K-weighting and measures its loudness characteristics over time.
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Loudness measurements describe signal characteristics. They do not determine whether a master is musically better, and this meter does not recommend forcing every track toward one streaming-platform number.
A LUFS meter looks at perceived program loudness differently from a basic peak meter. Instead of asking only how close the loudest digital sample gets to full scale, loudness measurement applies frequency weighting and evaluates signal energy across time.
That distinction matters when you are asking how loud is my song? Two tracks can reach similar peaks while having substantially different average loudness and dynamic behavior.
This audio loudness analyzer separates several measurements so that Integrated LUFS, Short-Term LUFS, True Peak and Loudness Range are not confused with one another.
A gated measurement intended to represent overall program loudness across the analyzed track.
A moving loudness view using a three-second analysis window, useful for seeing how loudness changes through a song.
An oversampled estimate designed to reveal peaks that may occur between the original digital samples.
A gated statistical view of how much short-term loudness varies across the analyzed program.
Integrated loudness is intended to describe the loudness of the program as a whole. It is not calculated by simply averaging every part of the file indiscriminately.
The meter first K-weights the signal and creates overlapping loudness blocks. Very quiet blocks are removed by an absolute gate. A relative gate is then derived from the remaining material before the final integrated value is calculated.
Integrated LUFS describes program loudness. Peak and True Peak measurements describe how high the signal reaches. A useful loudness check normally considers both rather than substituting one for the other.
A single Integrated LUFS value cannot show where a song becomes louder or quieter. Short-term measurement adds a time dimension to the loudness analysis.
The timeline uses three-second windows to show how measured loudness develops across the track. This can reveal contrasts between sections that would disappear inside one overall number.
Loudness Range, or LRA, looks at the statistical spread of gated short-term loudness. It is therefore another description of the program's loudness behavior, not a score for how dynamic or professional the music sounds.
A conventional sample peak meter sees only the amplitude stored at individual digital samples. The reconstructed waveform can reach a higher level between those samples.
A true peak meter estimates those inter-sample peaks through oversampling. This page therefore reports a True Peak estimate separately from its loudness measurements.
Streaming services may apply playback normalization, but that does not mean every master should be forced to one exact Integrated LUFS value. Platform behavior can also change, and playback settings may differ.
A useful approach is to understand what your master is actually doing: its overall loudness, peaks, variation through time and relationship to appropriate reference material. Then make mastering decisions for the music itself rather than treating one platform number as a universal mastering target.
If you want to compare those measurements against another production, use the Reference Track Matcher rather than interpreting a LUFS number in isolation.
Choose the audio file you want to inspect and run the analysis. For a meaningful Integrated LUFS reading, use the complete version of the mix or master that you actually want to evaluate rather than an arbitrarily selected fragment.
Start with Integrated LUFS for the overall loudness picture, then inspect the short-term timeline to see how that number is distributed through the track. Finally, compare True Peak and Loudness Range to understand other aspects of the signal.
If the loudness measurement raises a broader question about the technical condition of your master, continue with the Mastering Readiness Checker .
Use a specialized tool for the next question instead of trying to make one loudness number describe every property of a mix.
Choose your audio file in the meter above and select Analyze Loudness. The browser decodes the track and calculates Integrated LUFS together with short-term loudness data, Loudness Range and an oversampled True Peak estimate.
Integrated LUFS is a gated loudness measurement representing a program across its analyzed duration. It applies frequency weighting and loudness gating rather than simply averaging raw sample amplitudes.
Short-Term LUFS measures loudness over a three-second window. Looking at successive windows makes it possible to see how loudness changes through different parts of a song.
dBFS is a digital amplitude reference and is commonly used for sample-level measurements such as peak level. LUFS is designed for program loudness measurement and includes frequency weighting and time-based integration.
No. Sample peak considers the stored digital samples. True Peak attempts to estimate the maximum of the reconstructed signal between samples, which requires oversampling or equivalent reconstruction.
There is not one universal LUFS value that makes a master correct for Spotify or every other streaming service. Playback normalization should be considered separately from the artistic and technical decisions involved in mastering a particular recording.
Yes. Peak amplitude and program loudness describe different signal properties. Two tracks can have similar peaks while their average perceived loudness and dynamic structure differ considerably.
This implementation uses browser file access and local audio processing. The code on this page does not contain a request that sends the selected audio file to a server.
Use Ronter Audio Lab to inspect your audio, or contact Ronter Sound when your project needs professional recording, mixing or audio production work.
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