There is no hard and fast rule here at PBS on how to count the number of pages in a book. Many count the extra pages before and after the actual story, others don't. As long as you are within 4-8 pgs or so, it really doesn't matter that much. A sheet of paper (complete with both sides) doesn't weigh enough to make that much difference, so take your pick, add the extra pages or not, just don't add more than the actual physical number of pgs within the book, nor go below the number of pages within the story.
Another thing to do, is search a few other database sites (Amazon, B&N, Alibris, A1Books, etc) and pick the average or a greatest or least number. Again, as I said, there is no hard and fast rule, so if you are off a few pages either way, it is not going to matter enough to count. Part of this reason is not that we don't care, it is because there may well be 2-3 different publishers for the same ISBN copy of the book, and one may use heavier or lighter weight paper than the others, and we would have no way to tell which is which. So, because of this, the weight really can't be stated with hard, cast-in-stone, definitive accuracy.
It's not like you are going to make a .25 lb of difference in the actual weight, and if you do, which book/edition are you giving the weight for?
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