Radio Streaming Quality and Data Usage Explained
Key points
- Megabytes per hour ≈ bitrate × 0.45: 64 kbps uses about 29 MB an hour, 128 kbps about 58 MB and 320 kbps about 144 MB.
- An hour a day at 128 kbps adds up to roughly 1.7 GB a month.
- AAC sounds better than MP3 at the same bitrate, and speech needs far less than music.
- On mobile data, choose stations at 64 kbps or lower; on Wi‑Fi, 128 kbps and above is comfortable.
- Radio uses much less data than video. Over-the-air FM, AM and DAB+ use none at all.
Live radio uses far less data than video, but it adds up if you listen for hours on a mobile plan. Knowing how a station's bitrate translates into megabytes lets you choose the right balance between sound quality and data.
What bitrate means
Every station page on this site shows its Stream Quality, for example “128kbps MP3”. The number is the bitrate: how many kilobits of audio data are sent every second. The word after it is the codec, the compression method used (see what internet radio is). Higher bitrates generally preserve more detail, and also use more data.
How much data does a stream use?
The maths is straightforward. A stream at 128 kbps sends 128,000 bits every second. Divide by 8 to get bytes (16,000 per second), and multiply by the 3,600 seconds in an hour: about 57.6 megabytes (MB) per hour. As a shortcut, multiply the bitrate by 0.45 to get megabytes per hour.
| Bitrate | Data per hour | Typically used for |
|---|---|---|
| 32 kbps | 14.4 MB | Speech-only streams, very low bandwidth |
| 48 kbps | 21.6 MB | Talk and news, efficient codecs |
| 64 kbps | 28.8 MB | Talk radio, or music on efficient AAC streams |
| 96 kbps | 43.2 MB | Everyday music listening |
| 128 kbps | 57.6 MB | The common standard for music stations |
| 192 kbps | 86.4 MB | High-quality music |
| 256 kbps | 115.2 MB | Very high quality |
| 320 kbps | 144.0 MB | Maximum quality MP3 |
Figures use decimal megabytes (1 MB = 1,000,000 bytes) and ignore the small extra overhead of network headers, which is typically a few percent.
What that means over a month
- One hour a day at 128 kbps: 57.6 MB × 30 days ≈ 1.7 GB.
- Two hours a day at 64 kbps: 57.6 MB × 30 days ≈ 1.7 GB.
- Three hours a day at 128 kbps: 172.8 MB × 30 days ≈ 5.2 GB.
- Eight hours a day at 64 kbps (radio at your desk): 230.4 MB × 30 days ≈ 6.9 GB.
On Wi-Fi none of this matters. On a mobile plan with a small allowance, a lower-bitrate station is the easiest way to stretch your data.
Does a higher bitrate always sound better?
Not always. Three things matter as much as the number:
- The codec. AAC is generally more efficient than MP3, so an AAC stream often sounds as good as, or better than, an MP3 stream at the same bitrate.
- The content. Speech sounds clean at low bitrates, because voices contain less complex sound than a full band. Music with wide dynamics and lots of detail benefits more from higher bitrates.
- Your equipment. On a phone speaker or basic earbuds, the difference between 128 and 320 kbps is hard to hear. Good headphones or a hi-fi system show more.
Choosing the right quality
- On mobile data: pick stations at 64 kbps or below, especially for talk.
- On Wi-Fi at home: 128 kbps and above is comfortable; go higher for critical listening.
- On a weak or shared connection: a lower bitrate reduces buffering, as described in our guide to fixing stream problems.
How radio compares with other streaming
Live radio is one of the lightest ways to use your connection. Music streaming apps usually offer quality settings from around 24 kbps up to 320 kbps, so they use about the same data as a radio stream at the same setting. Video is a different scale: video services commonly quote around 1 GB per hour for standard definition and up to about 3 GB per hour for HD. In other words, an hour of HD video can use as much data as 50 hours of a 128 kbps radio stream.
Broadcast radio over FM, AM or DAB+ uses no mobile data at all, which makes it the best choice on long car journeys if your allowance is tight. Our comparison of internet radio, FM and DAB+ covers the other trade-offs.
How to use less data
- Check the bitrate before you press Play. It is shown on every station card and in the Stream Quality box on the station page.
- Prefer AAC or Opus streams at low bitrates. They sound noticeably better than MP3 at 32–64 kbps.
- Stop the stream when you stop listening. A playing stream keeps downloading even when the volume is muted, so press Pause or close the tab.
- Download nothing in the background. Other apps updating at the same time both use data and cause the stream to buffer.
- Set a data warning on your phone. Android and iPhone both show data use per app, so you can see exactly what your browser has used this month.
Frequently asked questions
How much data does an hour of online radio use?
Between about 14 MB (32 kbps) and 144 MB (320 kbps). The most common bitrate, 128 kbps, uses about 58 MB an hour.
Is 128 kbps good quality?
Yes, for most listeners. At 128 kbps, MP3 sounds good and AAC sounds very good on phones, earbuds and everyday speakers. Higher bitrates mainly help on good headphones or a hi-fi system.
Does pausing a radio stream use data?
Very little. When you pause, the player stops downloading shortly afterwards. When you press Play again, it reconnects to the live broadcast.
Not sure where to begin? See the beginner's guide to listening, or browse stations by country.