Is 320 kbps always better than 256 kbps?

Not meaningfully. 320 kbps is the top of the MP3 lossy range, and the returns flatten well before it: 256 kbps is already the standard most music platforms encode at, and beyond that the difference is marginal for essentially all listeners and equipment. Choose it when compatibility demands MP3 and you want the format's ceiling, not because it will sound better.

Where do the lossless numbers come from?

They are arithmetic, not measurements: sample rate multiplied by bit depth multiplied by channel count. Sixteen bits at 44100 samples per second across two channels gives 1411 kbps, and the 24-bit entries scale from the same sum at 48 and 96 kHz. That is also why they are fixed rather than chosen.

Can the tool tell me the bitrate of my own file?

No. Nothing is decoded or inspected, so the page has no way to read a loaded recording. It is a reference for choosing a setting, and to find what a file actually contains you would look at its properties or run it through a converter that reports the settings it used.

What does the Speech filter actually do?

It keeps rows at 96 kbps or below, plus any row whose written use case mentions speech. That is a rule over the table's own text rather than an analysis, which is why it can also keep a low rate row that is not really about dialogue.

Do variable bitrate files match these numbers?

Not exactly. The table lists constant headline rates, while variable bitrate encoding moves the number up and down with the passage and usually lands on a smaller average file at the same perceived quality. Nothing here distinguishes the two, so treat the figures as targets rather than guarantees.

Audio Bitrate Reference

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Audio Bitrate Reference is a lookup table of the bitrates you actually meet in practice, each with an honest quality band and a realistic use case beside it. Nothing is decoded or uploaded, because the point is to pick a number before you convert rather than guess afterwards.

What is Audio Bitrate Reference?

The table lists eleven rates, each with the formats it belongs to, a plain quality description and a use case written to be useful rather than flattering. Four filter buttons narrow the view, and none of them loads or analyses a file.

What the filters show:

All lists every row, from 32 kbps up to the uncompressed lossless entries.
Speech keeps anything at 96 kbps or below plus rows whose written use case mentions speech.
Music keeps 128 kbps and above, which is where most listening happens.
Lossless keeps only the rows above 1000 kbps.

The rates themselves fall into recognisable bands:

32 and 64 kbps for voice podcasts and audiobooks, the region where highs are audibly gone.
96 kbps for spoken word with music beds, and 128 kbps for casual music listening where critical ears first notice loss.
160 and 192 kbps, where AAC and MP3 respectively become hard to tell from the source for most listeners.
256 kbps as the music platform standard and 320 kbps as the MP3 ceiling, past which extra bits buy almost nothing.
The lossless rows: 1411 kbps for CD audio at 16-bit and 44.1 kHz, 2304 kbps for 24-bit at 48 kHz and 4608 kbps for 24-bit at 96 kHz.

Bitrate is how many bits per second a stream consumes. Lossy codecs such as MP3, AAC and Opus use psychoacoustic models to discard content you are unlikely to notice, which is why their rates are measured in hundreds of kilobits, while lossless formats keep the waveform intact and jump straight into megabit territory. The lossless figures are arithmetic rather than opinion: sample rate multiplied by bit depth multiplied by channel count, so 16 times 44100 times 2 gives 1411 kbps and the 24-bit rows scale from there. It also helps to read the numbers as two families. Everything from 32 to 320 kbps is a lossy setting that trades fidelity for size, and the returns flatten noticeably after 256 kbps. The uncompressed rows are fixed by their format rather than chosen for quality.

What the table deliberately does not claim:

It lists conventional rates rather than measuring your file, so it cannot report the bitrate of a recording you load.
The quality column is a subjective band, not a specification, and where those thresholds sit moves with the listener and the equipment.
Nothing distinguishes constant from variable rate encoding, which can carry the same headline number with very different results.
The Speech filter is text matching plus a level cutoff, not analysis, so it also keeps any row at 96 kbps or below whatever its content.
Compressed lossless formats such as FLAC and ALAC are not in the table, and their real rates sit well below the uncompressed rows above.
Bitrate is one axis only: sample rate, bit depth, channel count and the encoder all shape perceived quality at the same number.

Work backwards from the delivery. For a spoken podcast, 64 to 96 kbps mono is plenty and the low rows say so directly. For music headed to a streaming service, 256 kbps is where most platforms encode and 320 kbps is the safe lossy maximum. For an archive, choose a lossless row and stop worrying about the number, because there the bits are not waste, they are the point.

How to use Audio Bitrate Reference

Pick the filter that matches your job: Speech, Music or Lossless, or leave it on All to see the whole range.
Find the rate whose honest use case matches what you are actually delivering, not the highest number in the table.
Check the format column so the rate you chose belongs to the codec you intend to encode with.
Take that figure into a converter or a size estimate; nothing on this page changes a file.

When to use Audio Bitrate Reference vs related tools

Audio Bitrate Reference is a planning tool, so open it while the number is still undecided: before a conversion, before an upload, or when a file has come back too large or too small. Bitrate/Quality Converter is where the chosen rate is actually applied to a file, and Audio File Size Calculator turns the same figure into a predicted download size before you encode anything. If the question is really about bandwidth rather than storage, Streaming Bitrate Calculator works out what a stream needs, and MP3 Converter is the quickest route to a file at one of the rates in the table.

Privacy & Security

This tool runs entirely in your browser — no data ever leaves your device. There is no server round-trip, no upload, no logging, and no account required. Your input is processed locally using client-side JavaScript and is never stored, transmitted, or accessible to anyone else. When you close the tab, everything disappears.