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Dynamic Range (DR)
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Crest Factor
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Loudness Range (LRA)
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RMS Level
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True Peak
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Integrated LUFS (for context)
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Duration
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Dynamic range (DR) is the difference in decibels between the loudest and quietest parts of your audio. It measures how much contrast exists in a track — between the peaks and the average level. A track with high dynamic range breathes, with quiet verses and explosive choruses. A track with low dynamic range is uniformly loud, often the result of heavy compression and limiting. The DR value, popularized by the Pleasurize Music Foundation, is a widely used standard for expressing the dynamic range of a recording.
Crest factor is the difference between peak level and RMS (average) level. It tells you how much "headroom" exists above the average signal. A crest factor of 10–15 dB is healthy — it means transients (drum hits, attacks) punch through clearly. A crest factor below 8 dB means the track has been "squashed" — peaks are barely louder than the average, so transients lose impact and the mix sounds flat and fatiguing. Crest factor is one of the most revealing single numbers about mastering health.
The "loudness war" drove dynamic range down dramatically from the 1990s onward. Many modern releases measure DR6 or lower, meaning almost no dynamic contrast. Streaming platforms now normalize loudness, which has reduced the incentive to crush dynamics — but many masters are still over-compressed. The good news: with platforms normalizing to roughly -14 LUFS, tracks with higher DR actually sound punchier and more alive after normalization than their squashed counterparts.
| Genre | Typical DR | Character |
|---|---|---|
| Classical / Orchestral | DR14–DR20 | Very dynamic, wide contrast |
| Jazz / Acoustic | DR12–DR16 | Natural, open dynamics |
| Rock (well-mastered) | DR10–DR14 | Punchy with breathing room |
| Pop / Indie | DR8–DR11 | Moderately compressed |
| EDM / Hip-Hop | DR6–DR9 | Heavily compressed, loud |
| Loud Modern Master | DR4–DR6 | Over-compressed, fatiguing |
If your DR is below 8, your track is likely over-compressed. Try mastering with less limiter gain reduction — aim for no more than 2–3 dB of GR on the loudest peaks. Use a lower target LUFS (-14 for streaming) and let the platform normalize. Raise the crest factor by preserving transient peaks rather than crushing them. You'll get a mix that sounds louder after normalization and punchier on every playback system.