In order for your finished books to look professional, it is important to correctly design your perfect bound book spine.
When you submit printing files for perfect bound books, we recommend submitting the covers as three files — the front cover, the back cover, and the spine. The size of your front and back cover should equal the size of your document plus 1/8 inch bleed on all four sides.
To calculate the size of the perfect bound book spine, use the following formula:
For 60# uncoated text and 80# matte and gloss text stock:
Number of pages divided by 440 = spine in inches
For 70# uncoated text and 100# matte and gloss text stock:
Number of pages divided by 370 = spine in inches
Pages should be counted like pages in a book, not sheets of paper. The cover should be included in the number of pages.
For example, if your book is 100 pages and you are using 80# matte stock, your perfect bound book spine would be 100 pages divided by 440, or .23 inches. If you were using 70# uncoated stock, the spine would be 100 pages divided by 370, or .27 inches.
We also have a quick calculator on all of our multipage pricing calculator pages that will calculate the perfect bound book spine for you. Just go to the book printing page, booklet printing page, catalog printing page, or magazine printing page. One of the tabs under the calculator says Spine Calculator. Simply enter the paper you are using and the number of pages in your book and our calculator will calculate the size of your perfect bound book spine.