MP3 Bitrate Explained: 128 vs 192 vs 320 kbps — Which Should You Use?
Updated · 6 min read · MP3 Cutter Team
TL;DR
Bitrate is how many kilobits of data store one second of audio. 128 kbps is fine for speech and ringtones, 192 kbps is transparent for most music listeners, and 320 kbps is the maximum MP3 quality. Each minute of stereo audio is about 0.94 MB at 128 kbps, 1.4 MB at 192 kbps and 2.4 MB at 320 kbps.
What does bitrate mean?
An MP3 encoder throws away sounds the human ear is unlikely to notice. Bitrate (kilobits per second, kbps) sets how much data remains for each second of audio: more bits, fewer artefacts, bigger file.
File size per minute
| Bitrate | Size / minute | 3-min song | 1-hour podcast |
|---|---|---|---|
| 64 kbps | 0.47 MB | 1.4 MB | 28 MB |
| 128 kbps | 0.94 MB | 2.8 MB | 56 MB |
| 192 kbps | 1.41 MB | 4.2 MB | 84 MB |
| 256 kbps | 1.88 MB | 5.6 MB | 113 MB |
| 320 kbps | 2.34 MB | 7.0 MB | 141 MB |
| WAV (CD, uncompressed) | 10.1 MB | 30 MB | 605 MB |
Formula: size (MB) = bitrate (kbps) × seconds ÷ 8 ÷ 1024.
Which bitrate should you choose?
- Voice memos, lectures, audiobooks: 64–96 kbps mono is enough; 128 kbps if you're unsure.
- Ringtones and notification sounds: 128 kbps — phone speakers can't reproduce more detail.
- Podcasts: 128 kbps stereo or 96 kbps mono, the de-facto industry standard.
- Music for everyday listening: 192 kbps — most people can't distinguish it from the original in blind tests.
- Archiving or DJ use: 320 kbps, or better, keep a WAV/FLAC master.
Does re-encoding lose quality?
Yes, slightly. Each time you decode and re-encode an MP3 some detail is lost. To minimise it, export at the same or higher bitrate than the source, or export WAV if you'll edit the clip again. In MP3 Cutter the default is 192 kbps, a safe balance.
CBR vs VBR
CBR (constant bitrate) uses the same data rate throughout — predictable size and the widest compatibility, which is why MP3 Cutter uses it. VBR (variable) spends more bits on complex passages and fewer on silence, giving slightly better quality per megabyte.
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