# Data Transfer Time Question

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Hello everyone,

Decided to go get my CCENT cert (100-105) and currently going through the CBT nuggets videos by Jeremy.
In the Network Fundamentals: Speed, Data Size and Diagrams video he explains how to calculate your data transfer speed using the file size and connection speed.
To assist me in this task I am using a site Jeremy referenced during the video: [URL="http://CalcTool: Data Transfer"]http://www.calctool.org/CALC/prof/computing/transfer_time[/URL]

In his example:
8 MB file > 100 Mbps (connections speed) = Should take 0.610352 s

Just to practice I found an excel file in my computer with a file size of 25.2 KB.
25.2 KB > 100 Mbps (connections speed) = should take 0.00192261 s according to the site mentioned above.
I tried to complete the calculation manually just to have a better understanding of it and was not able to use Jeremy's calculation, due to the different units (MB and KB).
So here's what I did:
25.2 KB /1024 = 0.0246 B
0.246 B * 8 b = 0.00196875 b
0.196875 b / 100 mbps = 0.00196875 s (the transfer time calculation tool spits out 0.00192261 s, which is only obtained by dividing by 102.4 mbps instead of 100 mbps)

I may be giving this too much importance but just want to make sure I have the correct understanding of it.
Is there an easier way of doing this calculation?

Regards