An MP3's bitrate is how much data it uses per second of audio, in kilobits per second (kbps). More bits means fewer compression artifacts — and bigger files. The sweet spot depends on what you're listening to.
Bitrate vs file size
| Bitrate | Size per minute | Size for a 4-min song | Good for |
|---|---|---|---|
| 64 kbps | 0.48 MB | 1.9 MB | Voice notes, audiobooks (mono) |
| 128 kbps | 0.96 MB | 3.8 MB | Podcasts, casual listening |
| 192 kbps | 1.44 MB | 5.8 MB | Music — the everyday default |
| 320 kbps | 2.4 MB | 9.6 MB | Music you care about; DJ sets |
The math is simple: kbps × seconds ÷ 8 = kilobytes.
Can you hear the difference?
On phone speakers and most earbuds, 192 kbps and 320 kbps are very hard to tell apart. On good headphones, cymbals and reverb tails are where low bitrates give themselves away — "swishy" highs are the typical artifact at 128 kbps.
The rule that matters most
You can't add quality that isn't there. Converting a 128 kbps file to 320 kbps makes it bigger, not better. When the source is a video or a stream (YouTube audio is roughly 128–160 kbps), 192 kbps is plenty; choose 320 kbps only to avoid adding any extra loss.
Our recommendations
- Music library: 320 kbps from lossless sources (WAV, FLAC); 192 kbps otherwise.
- Podcasts: 96–128 kbps stereo, or 64 kbps mono for speech only.
- Ringtones and alerts: 128 kbps.
Ready to convert? Use the MP3 converter — pick the bitrate under Settings.