What size should the cover of my book be?
The cover of your book should be a bit larger than the pages of your book. Since most covers are wrap-around covers, you should take into account both sides as well as the spine. For instance, a book that is 5.5 x 8.5 with 120 pages will require a cover that is 8.5″ tall and 11.27″ wide (5.5″ front + 5.5″ back + .27″ spine = 11.27″). – 48Hour Books