Time and Data CalculatorsMbps vs MB/s: how to read your internet speed
Mbps is megabits per second and MB/s is megabytes per second. They differ by a factor of eight.
The letters
In Mbps, the b is for bits. In MB/s (or MBps), the B is for bytes. Your provider sells Mbps. Your browser, phone and download programs often show MB/s. One byte is eight bits, so divide Mbps by 8 to get MB/s.
A table of common plans
| Plan | Best case in MB/s | A 1 GB file takes (best case) |
|---|---|---|
| 10 Mbps | 1.25 | about 13 minutes |
| 30 Mbps | 3.75 | about 4.4 minutes |
| 50 Mbps | 6.25 | about 2.7 minutes |
| 100 Mbps | 12.5 | about 1.3 minutes |
| 300 Mbps | 37.5 | about 27 seconds |
| 500 Mbps | 62.5 | about 16 seconds |
| 1,000 Mbps | 125 | about 8 seconds |
The times use 1 GB = 8,000 megabits and are the best case, with no overhead.
Reading a speed test
A speed test shows download and upload speeds in Mbps, and often a "ping" or latency in milliseconds. Run it with a cable or close to the router, with other devices idle, and run it a few times. If the result is much lower than your plan, check your Wi-Fi first, then the router, then your provider's own line test.
Why you rarely see the full speed
Plans are described "up to" a speed. Overhead, Wi-Fi, the distance to the server, busy hours and the quality of the line all reduce it. If you get 80 to 90 percent on a cable, that is normal.
Upload and download
Many plans have a lower upload than download speed. Uploading a big file (a video to a cloud service) takes longer than downloading one of the same size.
Latency is a different number
Latency is the delay for a message to go and return, in milliseconds. A line can have high speed and high latency (a satellite link, for example). Latency matters for calls and games more than for downloads.
Common mistakes
- Comparing Mbps and MB/s without converting.
- Testing over Wi-Fi from another room and blaming the provider.
- Expecting the speed test result at all hours.
What speed do I need?
For video calls and streaming in high definition, 10 to 25 Mbps per user is typically enough; heavy households need more. Check your services' requirements.
Is Gbps the same as GB/s?
No. Gbps is gigabits per second. GB/s is gigabytes per second, eight times more.
This is an independent guide. It is not connected with the IERS, BIPM, IANA, NIST or any company named here. Facts were read on 14 November 2026 from the sources named on each page; calculated values come from Python.