Amazon categories decide which shelves, so to speak, a book sits on: they influence bestseller lists within that category and shape which browsing readers are likely to encounter the book at all. Because categories can look like a lever to pull for quick visibility, there is a lot of advice online about picking the "easiest" or "least competitive" category, largely to chase a bestseller badge rather than genuine readers.
This guide sets out a more useful way to think about category choice: starting from what the book actually is, then balancing genre or topic accuracy against reasonable discoverability. It draws on the current KDP category-selection system, though the details of that system can and do change, so always confirm the current options directly with KDP when making a change.
What categories are actually for
A category places a book among a defined group of comparable titles, which affects browsing, bestseller ranking within that category, and some recommendation behaviour. The value of this depends entirely on whether the readers browsing that category are the readers the book is actually for.
A category chosen because it is accurate helps a genuinely interested reader recognise the book as one of "theirs". A category chosen because it is under-populated, regardless of fit, may produce a badge without producing genuinely interested readers.
Accuracy over badge-chasing
The right category helps place the book alongside titles readers reasonably expect to find there. Choosing a low-competition category purely for an easier "#1 Bestseller" label, when the book does not genuinely belong there, tends to look impressive briefly without doing much for real discovery, and can even confuse or mislead readers who click through expecting something different.
Myth
“Choose low-competition categories for an easy bestseller badge.”
Reality
A badge earned in a category the book does not genuinely belong to rarely reaches readers who are actually interested, and does not change how well the book fits its true readership.
Balancing fit and discoverability
Within a genuinely accurate genre or topic, there is often more than one reasonable category or subcategory to choose from, some broader and more competitive, others narrower and more specific. This is where a real, honest balancing decision belongs: a narrower, accurate subcategory can offer a more focused readership, while a broader accurate category can offer more overall browsing traffic.
| Choice | Potential upside | Potential downside |
|---|---|---|
| Broader, accurate category | More overall browsing traffic | More competition, book may be less prominent |
| Narrower, accurate subcategory | More focused, closely matched readers | Smaller overall audience browsing that shelf |
| Multiple accurate categories (where allowed) | Covers more than one genuine angle on the book | Requires the book to authentically fit each one chosen |
Category considerations by book type
Fiction categories usually hinge on genre and subgenre conventions readers already recognise, such as setting, tone or trope-based subcategories within a wider genre. Memoir often sits at the intersection of a life story and a subject the memoir is about, such as illness, career or family, and can reasonably reflect both. Children’s books usually categorise by age range and theme together, since both genuinely affect who is browsing.
Non-fiction and business titles often benefit from categorising by the problem or skill addressed, alongside the broader subject area, since readers in these categories are frequently browsing with a specific need in mind. Series titles should generally categorise consistently across the series, since a mismatched category on one instalment can create a confusing browsing experience for readers following the series in order.
What not to assume
Do
- Start from what the book genuinely is and who reasonably browses that shelf
- Check KDP’s current category structure directly before assuming older advice still applies
- Balance breadth and specificity deliberately, based on genuine fit
Avoid
- Choose a category purely because it looks easier to top
- Assume a bestseller badge in an irrelevant category will bring meaningful new readers
- Copy another book’s categories without checking they genuinely apply to yours
A worksheet for honest fit
The most useful exercise here is an honest, unhurried comparison between the book and its candidate categories, ideally alongside a short list of comparable, already-successful titles in each one being considered.
Private worksheet
Category fit worksheet
A private working space for weighing up category options honestly, before making any change on KDP. There is no score; the aim is genuine fit.
Your answers stay in this browser tab only. Nothing is scored, sent or saved to an account.
A note on platform change
Common mistakes
- Chasing an easy bestseller badge. A badge earned in an irrelevant, low-competition category rarely reaches genuinely interested readers and can mislead the ones who do click through.
- Copying another book’s categories. A category that fits a similar-sounding book does not automatically fit this one; genuine comparison matters more than surface similarity.
- Ignoring reader expectation. A category mismatch can bring the wrong readers to the page, which tends to show up later as poor reviews rather than as an obvious early warning.
- Assuming older category advice still applies. KDP’s category structure changes periodically; current documentation should be checked before relying on older guidance.
- Treating category choice as a one-off, permanent decision. A reasonable category choice made at launch may need revisiting later if the book, or the platform’s category structure, genuinely changes.
Frequently asked questions
Should I choose the least competitive category to become a bestseller?
This is not advisable. A badge earned in a category the book does not genuinely fit rarely reaches interested readers and can mislead the ones who do click through.
How many categories can I choose on KDP?
KDP allows a limited number of categories, and the exact process and limits can change; check current KDP help documentation for the up-to-date position.
Can I choose different categories for different formats of the same book?
Formats are generally categorised individually on KDP, so it is worth checking each format’s categories are accurate and, where sensible, consistent with each other.
What if no existing category fits my book well?
Choose the closest genuinely accurate option rather than an unrelated one chosen for convenience, and consider whether the description and keywords can do more to clarify positioning.
Does a wider category always mean more sales?
Not necessarily. A wider category means more competition as well as more traffic; a narrower, accurate category can bring a smaller but more closely matched readership.