The size of a web page can vary depending on the amount of text it has, but above all by the number of pictures or graphics it uses.

A full page of text in HTML (approximately 500 words) will take up about 3 kilobytes (k) of space. 

Graphics, depending on how big and how detailed they are tend to be between 1k and 15 k. Most web pages use from 15 to 30  small images (1-3k) that load quickly.  

So, between the HTML text and the images, an average page would be about 20k, some smaller, some larger.

That means, with 20 Megabytes of disk space on our server, you could have as many as 100 pages on your site with graphics.