Help!

I am reading a number of books on my Kindle. As a result I no longer have page numbers and, more importantly, I have no total number of pages. The ability to vary the size of the font (and, in my case, use a big one to make it easier on my double vision problem) means the number of 'pages' can vary enormously - even if one could count them. I wanted to add up my number of pages read in 2012 and future years but how to do it. Any suggestions?