Free AI tool - United States

KDP Category Finder for US Authors

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Find the best Amazon.com categories for your book with AI-powered recommendations. Our tool analyses the US marketplace's 16,000+ browse categories, matches BISAC codes for IngramSpark distribution, and identifies low-competition niches where you can earn the #1 bestseller badge.

Freetool access
United Statesmarket context
Instantinteractive result
2026publishing guidance

How it works

Run the tool before you read the local guidance.

Step 1

Enter the book details

Start with the details the publishing platform or reader will actually see.

Step 2

Tune the market settings

Use the local version when pricing, compliance, metadata, or platform expectations change by region.

Step 3

Run the category finder

Generate the output while the publishing decision is still easy to change.

Step 4

Apply the result

Use the recommendation before you lock the listing, cover file, or launch plan.

Local guidance

Choosing Categories on Amazon.com

Use this context after the tool output so the result matches the market you are publishing into.

Amazon.com is the world's largest book marketplace, with over 16,000 browse categories across fiction, non-fiction, and children's books. The US store has the most granular category tree of any marketplace — for example, Romance alone has 20+ subcategories including Billionaire, Clean & Wholesome, Dark Romance, and Military Romance. This granularity is both an opportunity and a challenge for authors.

The #1 Best Seller badge on Amazon.com is highly competitive in broad categories like 'Literature & Fiction' or 'Self-Help', where you're competing with traditionally published titles backed by major marketing budgets. However, in specific subcategories like 'Science Fiction > Cyberpunk' or 'Cooking > Vegan', indie authors regularly achieve #1 status with modest marketing efforts. The key is matching your book to the most specific relevant category.

For US distribution beyond Amazon, BISAC codes are essential. IngramSpark, the primary distributor to Barnes & Noble, independent bookstores, and libraries, requires BISAC codes for every title. Libraries use BISAC codes for cataloguing and shelving. If you plan to distribute beyond KDP, our tool's BISAC matching ensures your book is correctly classified across all channels.

Amazon.com's category algorithm also influences your book's 'also bought' recommendations. Books in the same category cluster tend to appear in each other's recommendation carousels. Choosing categories that overlap with your comp titles means your book is more likely to appear alongside books your target readers are already buying.

After publishing on KDP, use Amazon Author Central (authorcentral.amazon.com) to request additional categories beyond your initial 3. The US Author Central team typically responds within 3-5 business days. Include your ASIN and the exact browse paths — our tool provides these in a copy-paste-ready format.

FAQ

Category Finder FAQs for United States

Frequently Asked Questions

Everything you need to know about Amazon KDP categories and BISAC codes

What are Amazon KDP categories?

Amazon KDP categories (also called browse categories) are the virtual shelves where Amazon places your book. When a reader browses 'Science Fiction > Space Opera' or 'Self-Help > Motivational', they're browsing categories. Amazon allows you to select up to 3 categories when publishing. Being in the right categories means your book shows up when readers browse topics they're interested in — and it determines which bestseller lists you can rank on.

How many categories can I choose on KDP?

When you first publish on KDP, you can select up to 3 browse categories. However, you can request up to 10 total categories by contacting Amazon Author Central support after your book is live. Email them with your ASIN, book title, and the exact category paths you want. Most requests are approved within 3-5 business days. Having more categories means more discovery paths for readers to find your book.

What are BISAC codes and do I need them?

BISAC (Book Industry Standards and Advisory Committee) codes are the universal classification system used by the book industry — bookstores, libraries, distributors like IngramSpark, and metadata services all use BISAC to categorise books. While Amazon uses its own browse category system (which overlaps with but differs from BISAC), you'll need BISAC codes if you distribute through IngramSpark, want library placement, or sell through traditional bookstores. Our tool maps Amazon categories to BISAC codes so you're covered for all distribution channels.

How do I change my book's categories after publishing?

You can change categories through two methods: (1) Edit your book details in your KDP dashboard — this lets you modify your initial 3 category selections at any time. (2) For additional categories beyond 3, email Author Central support at amazon-author-central@amazon.com with your ASIN and the exact category paths. You can also remove categories the same way. Changes typically take 24-72 hours to reflect on your listing.

What's the difference between a browse category and a BISAC code?

Browse categories are Amazon's proprietary classification system — they're the categories readers see when browsing the Kindle Store. BISAC codes are an industry-wide standard maintained by BISG. While there's significant overlap (many Amazon categories map directly to BISAC codes), Amazon has more granular subcategories in some areas and fewer in others. For example, Amazon has specific romance subcategories like 'Billionaire Romance' that don't have direct BISAC equivalents. Our tool shows both systems so you can optimise for all platforms.

Should I choose competitive or niche categories?

The optimal strategy is a mix: one competitive category for maximum visibility and two niche categories where you have a realistic shot at the bestseller badge. The orange '#1 Best Seller' badge is one of Amazon's most powerful conversion tools — it increases click-through rates by 20-30%. Check the #1 book in your target category: if it has fewer than 50 reviews, the category is likely achievable. Our tool shows competition levels to help you balance visibility with bestseller potential.

How does this tool work?

Our tool uses Google's Gemini AI, trained on extensive book industry data, to analyse your book's title, genre, synopsis, and comparable titles. It cross-references this with a database of BISAC codes and Amazon KDP browse categories to recommend the most relevant and strategically optimal categories. It also assesses competition levels and provides a strategy for which 3 categories to select first. The AI understands category nuances across all 5 major Amazon marketplaces (US, UK, Canada, Australia, Germany).

Do different Amazon marketplaces have different categories?

Yes, each Amazon marketplace has its own category tree that can differ significantly. Amazon.com (US) has the most granular categories — for example, it breaks romance into 20+ subcategories. Amazon.co.uk and Amazon.de have fewer subcategories in some genres but may have unique categories for local content. Our tool lets you select your target marketplace to get recommendations specific to that store's category structure.

Can I request additional categories from Amazon?

Yes! After your book is published, you can email Author Central support to request placement in additional categories — up to 10 total. Include your ASIN, book title, and the exact category browse paths (e.g., 'Kindle Store > Kindle eBooks > Science Fiction & Fantasy > Fantasy > Epic'). Our tool provides these exact paths in a copy-paste-ready format. Most category addition requests are approved within a few business days.

How often do Amazon categories change?

Amazon updates its category tree periodically — typically a few times per year — adding new categories, merging others, and reorganising subcategories. Major changes are often tied to seasonal trends or emerging genres (for example, 'LitRPG' was added as a category after the genre gained popularity). We recommend revisiting your category strategy every 3-6 months or whenever you notice changes in your bestseller rankings. Our AI stays current with the latest category structure.

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Next step

Use the result before the next publishing decision

The local notes below explain what changes for this market. Run the tool first, then use the guidance to avoid rework later.

Related route

Open the main category finder

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KDP Category Finder for US Authors

Find a category before you lock the listing

Run the tool before you read the local guidance.

Enter the book details

Tune the market settings

Run the category finder

Apply the result

Choosing Categories on Amazon.com

Category Finder FAQs for United States

Frequently Asked Questions

Use the result before the next publishing decision

Frequently Asked Questions