LUFS Calculator
How loud is your track or podcast — really? Measure integrated loudness, true peak and loudness range with broadcast-standard accuracy and see how Spotify, YouTube, Apple Music and other platforms will treat it. Files are analyzed in your browser.
- No upload
- LUFS · dBTP · LRA
- Platform targets
- Free
Drop audio files to measure
or
You can also paste with Ctrl+V (⌘+V on Mac) or drop a whole folder.
MP3 · WAV · M4A · AAC · FLAC · OGG · OPUS · MP4 / MOV video
Your files are processed on your device and are never uploaded.
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How to measure LUFS
Drop a file — the measurement starts automatically.
- 1
Add audio
Drop one or more files (audio or video) onto the page.
- 2
Read the results
Integrated LUFS, true peak, loudness range and more appear when the analysis finishes.
- 3
Compare & fix
See what each platform will do with your file and normalize it if needed.
Broadcast-standard loudness metering
The measurement used by streaming services and TV.
Integrated LUFS
Gated K-weighted loudness over the whole file, per ITU-R BS.1770-4.
True peak
4× oversampled peaks reveal the inter-sample overs that cause distortion after MP3/AAC encoding.
Loudness range
LRA (EBU Tech 3342) shows how dynamic your mix is.
Platform check
See instantly whether Spotify, YouTube, Apple Music & co. will turn your track down or up.
Loudness graph
Short-term loudness over time with your target as a reference line.
Batch
Measure an entire album or podcast season at once.
Private
Your unreleased mixes never leave your computer.
Free
No account, no limits.
What is LUFS?
LUFS (Loudness Units relative to Full Scale) measures how loud audio is perceived. Unlike peak or RMS levels, it weights frequencies like the human ear does (K-weighting) and ignores silence (gating). −14 LUFS is quieter than −8 LUFS; one LU equals one decibel.
Streaming services normalize playback: a master at −8 LUFS is turned down about 6 dB on Spotify, so it doesn’t sound louder than other songs — it only loses dynamics. Mastering close to the platform target keeps your punch. True peak should stay below −1 dBTP so that encoding to AAC/Ogg doesn’t clip.
Loudness range (LRA) describes the variation between quiet and loud passages: pop masters often have 4–7 LU, classical music 15 LU or more, and spoken podcasts 3–8 LU.
Loudness targets by platform
| Platform | Integrated | True peak |
|---|---|---|
| Spotify, Tidal, YouTube, Amazon Music | −14 LUFS | −1 dBTP (Amazon −2) |
| Deezer | −15 LUFS | −1 dBTP |
| Apple Music, podcasts | −16 LUFS | −1 dBTP |
| EBU R128 broadcast | −23 LUFS | −1 dBTP |
| ATSC A/85 (US TV) | −24 LKFS | −2 dBTP |
Tips
- Bring files to a target automatically with the Audio Volume Normalizer.
- See codec, bitrate and tags alongside loudness in the Audio Metadata Viewer.
- Visualize your track as an image with the Audio Waveform Generator.
- Measure tempo as well with the BPM Calculator.
Frequently asked questions
Can’t find your answer? Contact us — we reply quickly.
How do I measure the LUFS of a song?
Drop the file onto this page. The integrated loudness, true peak and loudness range appear as soon as the analysis is finished.
What LUFS should my music be?
Around −14 LUFS integrated with true peaks below −1 dBTP is a safe target for streaming. Louder masters are simply turned down.
What LUFS for podcasts?
−16 LUFS for stereo (−19 LUFS for mono) with true peaks below −1 dBTP — the Apple Podcasts and Spotify recommendation.
How accurate is it?
It implements ITU-R BS.1770-4 with absolute and relative gating, EBU Tech 3342 loudness range and 4× oversampled true peak — results typically match professional meters within ±0.1–0.2 LU.
What is the difference between LUFS and dB?
dBFS describes signal levels (e.g. peaks). LUFS describes perceived loudness over time. Both use the same scale: 1 LU = 1 dB.
Is my file uploaded?
No. The analysis runs entirely in your browser.
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