As applications become more complex, data files have grown larger. If you ever needed to transfer a file (using a service like FTP for example) and wanted to know how long that file transfer should take to reach its destination, you might want to try using a Bandwidth Calculator. You’ll need two things: file size and bandwidth speed.
Enter the two values and it will calculate the time in milliseconds. Very handy tool when you need to approximate how long a large file transfer will take.