If you are going to submit your site to very busy sites, find out from that site's webmaster how much extra traffic you should expect. Then, work out the size of your page and see if that extra traffic will remain within your bandwidth limit.
If you have Internet Explorer, you should be able to use the Bandwidth Calculator below. It will not work in other web browsers.
This bandiwidth calculator can also be downloaded to your machine but Internet Explorer is still required.
The Byte Converter
The Byte Converter by Malte Philipp will convert kb to mb, gb to mb, bytes to gb and all variations in between.
1 Byte = 8 Bit
For webmasters who want to put this bandwidth calculator on their web site.
Download Now - BandwidthCalc.zip - 28 KB
Ed's Free Downloads
Web Traffic and SEO