Internet plans are advertised in megabits per second, but browsers and file managers often show megabytes per second. Those are different units, so a download bar can look eight times smaller while the connection is performing normally.
Does this affect you?
Use this if a 200 Mbps plan seems to download at about 25 MB/s, or any time you are comparing a provider speed number with a file download progress bar.
Why the numbers look different
One byte equals eight bits. That is the whole trick.
- Internet plans and speed tests usually use Mbps, meaning megabits per second.
- Files and download progress bars usually use MB/s, meaning megabytes per second.
- To convert Mbps to MB/s, divide by 8.
- A 200 Mbps plan converts to about 25 MB/s before overhead.
- A 1 Gbps plan is 1,000 Mbps, which converts to about 125 MB/s.
Check your own connection
Use the same unit before judging the result.
- Find the advertised Mbps speed for your plan.
- Divide that number by 8.
- Compare the converted MB/s number with the browser or app download speed.
- If they roughly match, the connection is likely behaving normally and the difference is just units.
- Use a dedicated speed test when you want a direct Mbps-to-Mbps comparison with your plan.
More control
Watch lowercase b and capital B
Mb means megabit. MB means megabyte. That tiny letter difference explains most confusion between ISP ads and download bars.
Overhead keeps real results below the math
Even after converting correctly, network overhead, Wi-Fi quality, server limits, and active devices reduce real-world throughput. Around 80 to 90 percent of the converted number on a good wired test can be normal.
The same rule applies elsewhere
Storage, cameras, USB, and network gear often mix bits and bytes too. When comparing Mbps and MB/s, divide or multiply by 8.
Sources
- FCC – Broadband Speed Guide (2025)
- Ookla Support – Understanding Mbps and MB/s (2025)
- Microsoft Support – Why download speed differs from internet speed (2025)