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What is a book spine?

The spine is the outside edge of a book where the pages are gathered and bound. Its width is the page count times the thickness of the paper: 0.002252 in per page on KDP's white paper and 0.0025 in on cream. KDP prints spine text only on books of more than 79 pages.

What it means in practice

The spine belongs to the cover file, between the back and front panels, so the cover cannot be finished until the page count is. Change the interior or the paper and the cover has to be made again.

Keep spine text at least 0.0625 in from the spine’s edges, and at least 7 point, as KDP asks. Text on the front and back must stay out of the spine area entirely. Standard color paper prints from 72 pages, so a shorter color book has to use another paper.

How Chapbook uses it

The Paperback cover row sizes the spine from the interior’s own page count and the paper you pick. The title and your name go on the spine only when KDP allows it and the spine is wide enough for type of 7 point. The preflight report gives the width, and says why it is blank when it is.

The free KDP spine and cover template works out the same sizes for any page count.

In a real book

Cover of Slow Money by Rosa Almeida: a scored round sourdough loaf on flour in warm low light above dark type on cream, subtitle “What a family bakery taught me about pricing, patience and staying small”.
Title page. Page 1 of Slow Money.
Copyright. Page 2 of Slow Money.
Contents. Page 3 of Slow Money.
Prologue: The Second Oven. Page 4 of Slow Money.
Prologue: The Second Oven. Page 5 of Slow Money.
The First Price Rise. Page 6 of Slow Money.
The First Price Rise. Page 7 of Slow Money.
The First Price Rise. Page 8 of Slow Money.
The First Price Rise. Page 9 of Slow Money.
The Loan We Did Not Take. Page 10 of Slow Money.
The Loan We Did Not Take. Page 11 of Slow Money.
The Loan We Did Not Take. Page 12 of Slow Money.
The Loan We Did Not Take. Page 13 of Slow Money.
The Second Shop, and Why Not a Third. Page 14 of Slow Money.
The Second Shop, and Why Not a Third. Page 15 of Slow Money.
The Second Shop, and Why Not a Third. Page 16 of Slow Money.
The Second Shop, and Why Not a Third. Page 17 of Slow Money.
The Second Shop, and Why Not a Third. Page 18 of Slow Money.
Hours, and the Cost of Being Open. Page 19 of Slow Money.
Hours, and the Cost of Being Open. Page 20 of Slow Money.
Hours, and the Cost of Being Open. Page 21 of Slow Money.
Hours, and the Cost of Being Open. Page 22 of Slow Money.
The Wholesale Account We Let Go. Page 23 of Slow Money.
The Wholesale Account We Let Go. Page 24 of Slow Money.
The Wholesale Account We Let Go. Page 25 of Slow Money.
The Wholesale Account We Let Go. Page 26 of Slow Money.
Hiring Family and Paying Them Properly. Page 27 of Slow Money.
Hiring Family and Paying Them Properly. Page 28 of Slow Money.
Hiring Family and Paying Them Properly. Page 29 of Slow Money.
Hiring Family and Paying Them Properly. Page 30 of Slow Money.
What the Numbers Said Each January. Page 31 of Slow Money.
What the Numbers Said Each January. Page 32 of Slow Money.
What the Numbers Said Each January. Page 33 of Slow Money.
What the Numbers Said Each January. Page 34 of Slow Money.
Epilogue: Small on Purpose. Page 35 of Slow Money.
Epilogue: Small on Purpose. Page 36 of Slow Money.
Back cover of Slow Money: the description over the cover's artwork.
Prologue: The Second Oven 5 / 38
Slow Money, what a family bakery taught me about pricing, patience and staying small: a nonfiction book of 9,273 words and 37 pages on 6 × 9 in, generated from one brief and exported unedited. It is a sample, not a customer's book. Download the PDF (425 KB) or the EPUB (226 KB).

Sources

Last reviewed 30 October 2026

  1. Amazon KDP, “Create a Paperback Cover”
  2. Amazon KDP, “Paperback Submission Guidelines”
  1. What is trim size? Trim size is a printed book's final width and height, after the pages are cut. The sizes KDP offers, what they change, and the ones Chapbook's paperback uses.
  2. What is bleed in book printing? Bleed is artwork that runs past the cut line, so it reaches the page edge after trimming. KDP's bleed size, the page it makes, and when Chapbook adds it.
  3. What is print-on-demand? Print-on-demand means a book is printed only after someone orders it, with no stock to buy or store. How KDP's version charges for it, and where Chapbook fits.
  1. AI ebook writer for nonfiction: from one paragraph to EPUB An AI ebook writer for nonfiction: an outline you approve, chapters drafted in your voice from your own sources, then an EPUB 3, a typeset PDF, a Word file and a cover.

Questions people ask

How wide is the spine of a 104-page book?

On KDP's white paper at 6 × 9 in, a 104-page book has a spine of 0.234 in, and its full cover is 12.484 × 9.25 in with bleed. The paper you choose changes the width, so check KDP's calculator before you print.

Can a thin book have spine text?

Not at KDP. KDP prints spine text only on books of more than 79 pages. Below that, the spine stays blank.

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