Amazon assigns bestseller rank by category. Choose the right categories and you can hit #1 bestseller with a fraction of the sales a top-level category would require. Here is exactly how to do it.
Every book on Amazon has a Best Seller Rank (BSR) — a number that reflects recent sales velocity. BSR #1 means best-selling; BSR #1,000,000 means very few recent sales. Amazon calculates BSR separately for every category your book is listed in.
This means a book that ranks #50,000 overall on Amazon could simultaneously be the #1 bestseller in a niche subcategory like "Ships& the Sea Adventure Fiction." The orange bestseller badge appears on your book listing in search results — and readers see it and click.
The strategy is simple: identify categories where the current #1 bestseller is achievable for your sales level, get added to those categories, and earn the badge.
Note: BSR-to-sales conversion varies by category. Use Publisher Rocket for accurate estimates in your specific genre.
During KDP book setup, Amazon lets you choose 2 browse categories. These are your starting point. The key mistake here is choosing the most obvious top-level category — like "Mystery, Thriller & Suspense" — where you will be competing against James Patterson and Gillian Flynn.
Avoid (too competitive)
Target (achievable)
This is the most important tip most authors do not know. After your book is published, you can email Amazon KDP support and request to be manually added to additional categories — up to 10 total. This is an official, supported feature.
How to request additional categories:
You can find category paths by navigating Amazon's category tree and copying the breadcrumb navigation from any bestseller list page.
Before adding a category, evaluate whether it is achievable. Navigate to the category's bestseller list on Amazon and look at the BSR of the #1 book.
Research process:
Also check how many reviews the #1 book has. High review counts combined with high sales indicate a deeply entrenched category that is hard to crack.
The sweet spot for Amazon category strategy is a subcategory that is specific enough to be achievable, but not so obscure that almost no one browses it.
Too Broad
Top 50 requires 200+ daily sales. Unreachable for most indie authors.
Sweet Spot
Top 10 requires 20–50 daily sales. Achievable with modest ad spend.
Too Niche
#1 with 1 sale/day. Easy to rank but almost no organic traffic.
Amazon has a hidden feature: some categories are only available to books that include a specific keyword in their KDP keywords field. These "keyword categories" unlock niche, less-competitive placement opportunities.
Known keyword-category unlocks:
The full list of keyword-unlocked categories changes periodically. Publisher Rocket maintains an updated list, or search the KDP community forums for current keyword-category pairings for your genre.
Category strategy is not a one-time setup — it requires monitoring and adjustment. Your BSR fluctuates with sales velocity, and categories that were achievable last year may become more competitive as more indie authors discover them.
Monthly category audit:
Your BSR is determined by sales velocity. More reviews lead to higher conversion rates from Amazon search clicks — and higher conversion rates mean more sales — which means a better BSR — which means higher category rankings.
ARC reviews collected before and during launch directly impact your category performance. A book that launches with 15+ reviews converts at a meaningfully higher rate than a book launching with 0 reviews.
The category flywheel: Reviews → Higher conversion → More sales → Better BSR → Higher category rank → Bestseller badge → More organic clicks → More reviews.
Illustrative conversion rates — actual results vary by genre and cover quality
Your category strategy works harder when your book converts well. iWrity connects your book with genre-matched ARC readers who post real reviews — improving your conversion rate and pushing your BSR up the category ladder.
Get ARC Reviews on iWrityFree to start — list your book and connect with readers today
