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There is no single fixed size for a FLAC song. File size depends mainly on playing time, the recording’s audio content, sample rate, bit depth and number of channels. FLAC preserves the decoded audio exactly while compressing the original PCM data, but different recordings compress by different amounts.
What determines a FLAC file’s size?
- Duration: At the same average bitrate, a track twice as long has about twice the audio payload.
- Audio content: Silence and simple passages compress much more than dense, noisy or highly dynamic material. Xiph’s FLAC FAQ explains that encoded noise can approach the input rate, while silence can approach zero.
- Sample rate, bit depth and channels: Higher values create more input data and can produce larger FLAC files.
- Metadata: Tags, embedded artwork, padding and container information add to the encoded audio payload.
- Encoding settings: FLAC compression levels change encoding speed and compression efficiency, not the decoded audio quality.
Useful size references
CD-quality PCM before compression
Stereo CD-quality PCM uses 44,100 samples per second, 16 bits per sample and two channels. The resulting data rate is 1,411,200 bits per second, or 176,400 bytes per second. That equals approximately 10.584 decimal MB per minute (about 635 MB per hour) before compression. This is an uncompressed reference, not the expected size of every FLAC file.
Amazon Music delivery examples
Amazon Music’s developer documentation lists an 800 kbps average HD FLAC stream and a 1,600 kbps average UHD FLAC configuration. Those figures correspond to roughly 6 MB and 12 MB of audio payload per minute, respectively, using decimal units and excluding container or metadata overhead. They describe Amazon’s delivery configurations, not universal FLAC rates or a promise about the size of a locally encoded file.
| Reference | Rate or parameters | Approximate audio payload | What it means |
|---|---|---|---|
| Stereo CD-quality PCM | 44.1 kHz, 16-bit, 2 channels | 10.584 MB/minute uncompressed | Parameter-based reference before FLAC compression |
| Amazon HD FLAC stream | 800 kbps average | About 6 MB/minute | Amazon-specific streaming example |
| Amazon UHD FLAC configuration | 1,600 kbps average | About 12 MB/minute | Amazon-specific streaming example |
How to estimate a FLAC file yourself
If you know the average bitrate, estimate the audio payload with:
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size in bytes = bitrate in bits per second × duration in seconds ÷ 8
- Convert the track length to seconds.
- Multiply by the average bitrate in bits per second.
- Divide by eight to convert bits to bytes.
- Divide by 1,000,000 for decimal MB or by 1,048,576 for binary MiB.
- Allow for tags, artwork, padding and headers; the result is an estimate, not an exact filesystem size.
For example, an 800 kbps average stream lasting four minutes has an estimated payload of 800,000 × 240 ÷ 8 = 24,000,000 bytes, or about 24 MB (22.9 MiB). A 1,600 kbps stream of the same duration is about 48 MB (45.8 MiB) of payload.
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For an existing file, the reliable answer is to inspect its actual byte size and duration with your operating system or media player. For an unencoded stereo CD-quality source, use the 10.584 MB-per-minute reference above.
Why two FLAC files of the same length can differ in size
Two five-minute tracks may have different sizes because their signals contain different amounts of information. A quiet acoustic recording, a heavily processed track and a recording with substantial hiss do not present the encoder with the same data. Different sample rates, bit depths, channel layouts and source masters also change the result.
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FLAC is lossless relative to its input: decoding returns the same PCM samples that were encoded. That does not prove that two files came from the same master, or that a file was never transcoded from a lossy source. File size alone cannot establish audio quality or provenance.
Does a higher FLAC compression level reduce audio quality?
No. FLAC compression levels trade encoding time and processor work against compression efficiency. A higher level may take longer and save some space, but it remains lossless. The decoded audio is not degraded by choosing a different FLAC level.
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Because compression depends on the recording, there is no universal percentage by which every FLAC is smaller than PCM. Xiph’s FLAC FAQ notes that you do not specify a fixed bitrate as you would with many lossy codecs; the resulting bitrate follows the information in the original signal.
Independent reader supportYour contribution helps us test, update, and keep practical guides available for everyone.Planning storage for a FLAC library
Estimate storage from your own recordings’ measured or expected average bitrate and total playing time rather than from a single “typical song” number. Keep the unit convention consistent: manufacturers often use decimal GB, while some operating systems display binary GiB.
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- Separate ordinary CD-quality files from high-resolution files; they do not have the same input rate.
- Include room for artwork, tags, alternate masters and future additions.
- For removable storage, verify that the player supports both the card capacity and FLAC playback. A larger card provides space; it does not enable FLAC support or improve sound quality.
Quick answers
Can a FLAC file be smaller than expected?
Yes. Long silent sections or highly compressible material can produce a very low resulting bitrate.
Can a FLAC file be nearly as large as uncompressed PCM?
Yes. Signals with little redundancy, including encoded noise, may compress poorly and approach the input data rate.
Is a larger FLAC file higher quality?
Not necessarily. A larger file may simply be longer, use a higher sample rate or bit depth, contain more channels, include a different master, or be less compressible.
Quick Recap
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