Replay Gain Calculator
Measure integrated loudness, true peak and the Replay Gain offset for any audio file. Plays nicely with foobar2000, MusicBee, VLC and Rockbox.
Drop your audio file here
or click to browse a file
Calculates integrated loudness, true peak, loudness range and the Replay Gain offset for your chosen reference.
Reference loudness
Replay Gain stores the offset (in dB) that a player should apply to play your track at the chosen reference level. The calculator just produces the value — it doesn't modify your file.
About Replay Gain
Replay Gain is a metadata tag (REPLAYGAIN_TRACK_GAIN) that tells a music player how many dB to add or subtract from a track at playback so it matches a reference loudness. It's the opposite of permanently re-encoding for loudness — the audio file is left untouched, the player does the gain at decode time. The result is a library where every track plays at the same perceived level without ever modifying the source.
This calculator measures your file's integrated LUFS (the perceived-loudness value), its true peak in dBTP, and its loudness range in LU. It then computes the Replay Gain offset for the reference you pick. The default reference is −18 LUFS, the ReplayGain 2.0 standard. Other references (−14 LUFS Spotify, −16 LUFS Apple, −23 LUFS broadcast) are available too, depending on what your library is targeting.
How to calculate Replay Gain
- 01
Drop your file
MP3, WAV, FLAC, OGG, AAC, M4A — any common audio format. The longer the file, the more accurate the integrated LUFS measurement.
- 02
Pick a reference
−18 LUFS is the ReplayGain 2.0 standard. −14 LUFS matches Spotify. −16 LUFS matches Apple Music / podcast spec. −23 LUFS is the broadcast standard.
- 03
Read the offset
The result card shows the exact dB offset to write into REPLAYGAIN_TRACK_GAIN. Paste it into your tagger of choice.
Why use this Replay Gain calculator
- Broadcast-grade loudness measurement
- Four reference levels — RG 2.0, broadcast, Spotify, Apple
- Reports integrated loudness, true peak and loudness range
- Doesn't modify your file — measurement only
- Free, private, no install
- Compatible numbers for foobar2000, MusicBee, VLC, Rockbox, Vinyl etc.
Replay Gain FAQ
Why doesn't this tool write the tag for me?
ID3 / Vorbis / iTunes-style tag writing for ReplayGain frames is fiddly per format. We surface the value so you can paste it into a desktop tagger (Mp3tag, Kid3, MusicBrainz Picard) which knows the right frame name for each container.
What's the right reference?
If your library is for a Replay-Gain-aware player like foobar2000, use −18 LUFS (the standard). If your library is for streaming-style listening, −14 LUFS matches Spotify and YouTube. There's no objectively right answer; pick the one your playback environment expects.
Why is the loudness measurement slightly different than other tools?
We use the modern RG 2.0 algorithm. Tools that use the older Replay Gain 1.0 algorithm (which used a different psycho-acoustic curve) will give slightly different numbers.
Is my file kept private?
Yes. We don't analyse or index your file.
More master & tools tools
Loudness, tags, inspect, generate