How to Calculate Data Transfer Usage (4 Steps)

Determine the size of the Web page being transmitted. As an example, take a website that consists of 5KB of text and two 20KB pictures. Together the page is 45KB of data.
Determine how many visitors have viewed the page (or are expected to view it). This is how many 'hits' the page receives. For the example page, it received 100 visitors in the past month.
Multiply the number of visitors by the size of the Web page to get the data transfer usage for that Web page. For the example, the data transfer usage for the month was 100 visitors x 45KB = 4,500KB.
Take the average size of all Web pages when calculating the data transfer usage for a large website. Multiply this by the number of visitors and then by the average number of pages viewed by each visitor. As an example, take a site that has five Web pages that are each 20KB, with 1,000 visitors and each visitor on average views three pages. Average Web page size is (20 + 20 + 20) / 3 = 20 KB. 20KB x 1,000 visitors x 3 pages viewed each = 60,000KB data transfer usage.
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