Ask ten authors how they picked their Amazon categories and nine will tell you they clicked whatever KDP suggested at upload. That is why their book is not ranking, and why a £20,000 Amazon bestseller campaign is almost entirely about fixing the categories first.
This article walks through how category choice actually works on Amazon, and how to pick yours like someone who wants to rank.
The rule nobody tells you: you get ten categories, not two
When you upload a book to KDP, Amazon asks for two categories. Most authors pick two, click publish, move on. What Amazon does not tell you is that you can request up to ten categories total, via a separate process. Ten. Not two.
The other eight are where bestseller flags come from. Each category is its own ranking leaderboard. If you are in ten, you have ten chances to hit #1 in a sub-niche, each of which earns the orange "#1 Best Seller" badge on your listing.
How to request the other categories: go to Amazon KDP support, open a ticket, list the exact categories you want, and provide your ASIN. They usually grant the request within 48 hours. No charge.
The 2-level vs 5-level category trap
Amazon's category tree has depth. "Business & Money" is a top-level category. Under it: "Marketing & Sales." Under that: "Marketing." Under that: "Direct Marketing." Under that: "Telemarketing." The deeper you go, the smaller the category and the easier it is to rank.
Most authors pick top-level categories. Those are the hardest places to rank because everyone is fighting for them. A book at #1 in "Business & Money" might need 300-500 sales a day. A book at #1 in "Telemarketing" might need 8-12 sales a day. The bestseller flag is the same.
Rule of thumb: your ten categories should be a mix of 2 broad (for credibility), 4 medium (for discoverability), and 4 very specific (for the bestseller flag).
How to actually find good categories
Three steps.
Step 1: Find books that are not you
Open Amazon. Search your topic. Click on three or four books that are similar to yours and sell well. Scroll down each book's listing to "Product details." Look for "Best Sellers Rank."
You will see something like:
Best Sellers Rank: #2,432 in Books #8 in Direct Marketing (Books) #12 in Small Business & Entrepreneurship #34 in Advertising
Those are the categories that book is actually in. Write them down.
Step 2: Find the thin categories
Click each of those category names. It opens the leaderboard. Look at the #1 through #20 books. Check their reviews. Check how often they are updated. If the #5 book has 12 reviews and was last updated in 2019, you are looking at a thin category. Those are gold. You can rank in them with a modest launch.
Step 3: Confirm the category still exists
Amazon changes category names occasionally. Before you request a category from KDP, make sure you can see it on a live book's listing (not just in an old article or blog post). Requesting a category that was retired wastes your 48 hours.
The seven keyword slots
The keyword field during KDP upload is not a tag list. Each slot is a search phrase. Writing "marketing" in slot 1 does almost nothing. Writing "marketing for small business owners" in slot 1 helps the book surface when someone types that exact phrase into Amazon.
Rules:
- Use full phrases, not single words.
- Include the exact phrase a reader would type. "Overcome self-doubt" is a phrase. "Confidence" is not a phrase.
- Do not stuff keywords together (Amazon ignores word salad).
- You can change keywords any time. Treat them as a live experiment.
To find keyword phrases that sell: use Publisher Rocket (paid, £79) or just type the start of a phrase into Amazon's search bar and watch the autocomplete suggestions. Amazon's autocomplete is based on what real readers actually search.
A+ content: the free conversion lift nobody uses
A+ content is the image-rich section that appears below your book description on the product page. It is free. Amazon rolled it out to KDP authors and about 85% of self-published authors still don't use it.
Good A+ content includes:
- A header with your key promise in one clear sentence
- A "what's inside" visual with chapter highlights
- An author photo + short credential block
- A quote block with one powerful line from the book
- A call-to-action panel with one clear next step
Authors who add A+ content consistently report 5-20% lift in conversion from sample-to-sale. That compounds on every visit to your listing, forever. Spend the afternoon setting it up once.
Pricing is a category decision
Inside each Amazon category there is a price norm. Non-fiction self-help lives at £6.99-£14.99. Business strategy lives at £9.99-£19.99. Children's picture books live at £7.99-£12.99. If your price is 30% below the norm, readers suspect the book is low-quality. If it is 50% above, you need to earn the trust.
Practical pricing: start at the top of your category norm. Drop the Kindle version to £4.99 for the launch window only (Amazon algorithms love price drops). Return to full price after two weeks.
The fastest way to rank is to enter an underserved sub-category with a good book
That is the whole article in one sentence. Everything above is tactics. The strategy is: pick ten categories, at least four of them specific, and put a book that belongs there.
If you want us to do the category research for you, that is part of every Guaranteed Amazon #1 Bestseller campaign. We typically find 3-5 categories the author had never considered and which become the easy wins.
Want a team to run this for you?
Global.Media runs Guaranteed Amazon #1 Bestseller campaigns with a 100% success rate and a money-back guarantee. If your book is already published and stuck, this is usually the fastest way to turn it around.