The answer is three — per format, directly in the KDP dashboard. The old system of requesting up to ten via KDP support is gone. Here is what that means for your strategy and how to maximise the coverage of three slots.
| 8-minute read | Beginner |
One of the most common pieces of outdated category advice circulating in KDP communities is the instruction to “email support to request up to ten categories.” This system no longer exists. Since mid-2023, KDP authors have three category slots — selected directly in the dashboard — and that is the full allocation. For the complete strategy for using those three slots, see our complete guide to Amazon KDP categories.
The Three-Category Limit
KDP allows you to select up to three categories per book format during the publishing process, or at any time afterwards through the KDP Bookshelf. These are selected from Amazon’s own store category hierarchy — the same categories readers browse. The three-category limit is firm. KDP support cannot add categories beyond this limit, and there is no support request pathway to expand your allocation.
To update categories: KDP Bookshelf → ellipsis (…) → Edit details → Details tab → Categories. Changes take 24–72 hours. There is no limit on how often you can change categories.
What Happened to the Ten-Category System
Before mid-2023, the system worked differently: authors chose two BISAC codes during publishing, which Amazon translated into its browse categories. Authors could then email KDP support to request additional browse categories — up to ten total. Amazon ended this system in mid-2023, replacing the BISAC-code selection with direct Amazon store category selection and eliminating the support request pathway entirely.
The motivation for the change was partly to prevent “category stuffing” — the practice of placing books in large numbers of irrelevant categories to artificially inflate visibility and bestseller badge opportunities. The three-category cap makes category selection more deliberate and levels the playing field between authors who optimise their categories carefully and those who tried to game the old system.
Categories Per Format
The three-category limit applies per format — Kindle ebook, paperback, and hardcover each get three independent category slots. If you publish both a Kindle ebook and a paperback, you have six total category slots to work with. Use this independence strategically: give different formats different subcategories to maximise your book’s total browse footprint across the category hierarchy. Do not simply copy the same three categories across all formats and leave half your total allocation underused.
How Amazon May Assign Additional Categories
Beyond your three chosen categories, Amazon uses your full metadata — title, subtitle, description, and backend keyword fields — to contextualise your book and may place it in additional browse categories algorithmically. You cannot directly control or guarantee these extra placements, but accurate and specific metadata gives the algorithm more to work with. Using one or two keyword fields with category-anchoring terms reinforces your intended placement and may lead to additional relevant category assignments. See our article on KDP keyword research for the full keyword strategy.
Getting Maximum Coverage From Three Slots
Three slots, used well, provide more valuable coverage than the old system of ten slots used carelessly. The keys: verify every selection is a real category (not a ghost); confirm no two selections are duplicates of each other; choose the deepest applicable subcategory in each slot (you get all parent categories above it for free); and spread your three slots across different branches of the hierarchy rather than three paths within the same tree.
Your category strategy brings the right readers to your book. Manuscript proofreading for self-published authors from Vappingo ensures the content those readers find is error-free and publication-ready.
