Friends at CpWebhosting tell us about how to calculate Bandwidth?
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Tosh
Dedicated Hosting

Calculate the number of GBs (GigaBytes) of transfer per month.
Each 1000 MBs is equivalent to 1 GB. From the above example, we have 228,750 MB / 1000 MB/GB = 228.75 GB per month of transfer.

Determine the approximate connection speed required to support the level of transfer.

Allow for growth by calculating 40% overhead availability.

Based upon our services, you would need between 1 Mbps and 2 Mbps to provide effective service for your 5000 visitors per month.