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Understand your Internet Speeds – Megabits vs. Megabytes


One thing that often gives people confusion is the difference between a Megabyte (MB) and a Megabit (Mb). People often assume that a download speed of 1 Megabit per second (1 Mbps) will allow them to download a 1 Megabyte (MBps) file in one second. This is not the case.

What is Internet Speed?

Internet speed, the number they give you (4 Mbps, for example), has nothing to do with how fast your internet works. It’s not like a car or motorcycle where you can measure how fast it goes in miles per hour (mph). Instead, internet speed is your (allocated) bandwidth. Bandwidth is the amount of data that can be sent to you, usually measured in seconds. For example, 4 Mbps would mean that you can receive up to 4 megabits of data per second. Internet upload and download speeds are measured in megabits per seconds, which means that to download a 1MB file in 1 second you would need a connection of 8 Mbps.

Usually, megabits per second (mbps) are generally used to describe the speed of an Internet connection, whereas megabytes (MB) usually refer to the size of a file or storage space. One byte is made up of 8 bits, which means that you need to pay extra close attention to which unit you’re using, which is especially confusing.

Bytes are represented with a capital B, and bits are represented with a Lower case b:

  • Megabyte = MB
  • Megabit = Mb
  • MBps = Mega Bytes per second
  • Mbps = Mega bits per second

1 Megabyte = 8 Megabit

1 Megabyte = 1024 Kilobyte (KB)

8 Megabit = 1024 Kilobyte

Therefore, 1 Megabit (Mb) = [1024/8 =] 128 Kilobyte (KB)

So, it should be noted that you need to convert between Megabytes and Megabits if you are looking into how long a file will be downloaded.

For example: If you have an internet connection with a consistent 1 megabit per second speed, it will only be able to download a 1/8 Megabytes every second. So if you are downloading a 10 Megabyte file through the said connection, it would take 80 seconds to the download that file and not just 10. It is just a matter of multiplying or dividing by 8.

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