Amazon Category Research

Select the right 3 Amazon categories for your book. This is a one-time, high-stakes decision—categories can't easily be changed after publishing, and 27% of KDP categories are "ghost categories" that don't actually work.

Purpose

Answer one question: Which 3 categories should this book be in?

This skill does NOT cover keywords (separate skill) or book descriptions (separate skill). Just categories.

When to Use This Skill

• "Which categories should I choose for my book?"
• "I'm publishing on KDP and need to pick categories"
• "Is [category name] a good category?"
• "How do I become a bestseller on Amazon?"
• "What categories are my competitors in?"

Not for: Keyword research, book description writing, cover design, or pricing strategy.

The 4-Step Method

Step 1: Find Comp Titles

Identify 5-10 books similar to yours that are selling well.

How to find them:

• Search Amazon for your topic
• Look for books with 50+ reviews and BSR under 100,000
• Note the ASIN (10-character ID starting with B) for each

What makes a good comp:

• Similar topic/genre to your book
• Published in last 2-3 years
• Actively selling (BSR under 100,000)

Step 2: Extract Their Categories

Use BKLNK (free tool) to see all categories for each comp title.

Process:

1. Go to bklnk.com
2. Enter the ASIN
3. See all categories the book is listed in
4. Note which categories appear across multiple comps

What you're looking for:

• Categories that multiple successful comps share
• Specific subcategories (not just "Fiction" or "Non-Fiction")
• Categories that actually have bestseller rankings

Step 3: Analyze BSR for Each Category

For each candidate category, check the competition level.

How to check:

1. Go to Amazon's category page
2. Note the BSR of the #1 book
3. Note the BSR of the #20 book
4. Use the BSR calculator:

   scripts/bsr_to_sales.py

Competition levels:

Step 4: Apply the Portfolio Strategy

Select 3 categories with different competition levels:

Why this works:

• Slot 1 gives you a quick win (bestseller badge = social proof)
• Slot 2 provides consistent discoverability
• Slot 3 positions you for growth

Critical Warning: Ghost Categories

27% of KDP categories are "ghost categories" that:

• Have no category page on Amazon
• Can't earn bestseller badges
• Provide zero discoverability

Before selecting ANY category:

1. Search Amazon for that category
2. Click through to verify the page exists
3. Confirm books in that category have bestseller badges

If you can't find a real category page: DO NOT SELECT IT.

See

references/ghost-categories.md

Tools

scripts/bsr_to_sales.py

Reality Check: The Free Path Requires Manual Work

BSR data is not easily scraped. Amazon pages are JavaScript-rendered and don't yield BSR numbers to automated tools.

The free workflow:

1. Find comp titles via Amazon search (works)
2. Extract categories via BKLNK (works)
3. Get BSR numbers → Must visit each Amazon product page manually, scroll to "Product Details," and note the BSR
4. Convert BSR to sales via calculator (works)

The paid workflow:

• Publisher Rocket ($199-299 one-time) automates steps 2-4 AND detects ghost categories
• KDSPY ($79 one-time) adds BSR overlay to Amazon pages as you browse

Recommendation: For a single book, the free path is fine (budget 1-2 hours). For multiple books or ongoing publishing, Publisher Rocket pays for itself in time saved.

Quick Reference: Research Template

Copy

assets/research-spreadsheet.csv

Example: Applying the Method

Book: A guide to Christian fasting practices

Step 1 - Comp titles:

• "Fasting" by Jentezen Franklin (ASIN: B001ANSS7U)
• "The Fasting Edge" by Jentezen Franklin
• "A Hunger for God" by John Piper
• "Atomic Power of Prayer and Fasting" by Cindy Trimm

Step 2 - Categories extracted via BKLNK:

• Religion & Spirituality > Christian Living > Spiritual Growth
• Religion & Spirituality > Christian Living > Prayer
• Health, Fitness & Dieting > Diets > Fasting

Step 3 - BSR analysis:

• Spiritual Growth: #1 BSR = 3,500 (High competition)
• Prayer: #1 BSR = 8,000 (Medium)
• Fasting (Health): #1 BSR = 15,000 (Low)

Step 4 - Selection:

1. Niche: Health > Diets > Fasting (easy badge)
2. Mid: Christian Living > Prayer (steady)
3. Growth: Christian Living > Spiritual Growth (upside)

Bundled Resources

• references/bsr-thresholds.md

  - What BSR numbers mean for sales

• references/ghost-categories.md

  - How to identify and avoid ghost categories

• references/category-examples.md

  - 8+ real case studies with results

• scripts/bsr_to_sales.py

  - Convert BSR to daily sales estimates

• assets/research-spreadsheet.csv

  - Template for tracking research

Common Mistakes

1. Selecting broad categories - "Fiction" or "Non-Fiction" = drowning in competition
2. Not verifying for ghosts - Trust the KDP dropdown at your peril
3. All eggs in one basket - Using all 3 slots on similar categories
4. Ignoring comp research - Guessing instead of following proven paths
5. Set and forget - Categories that worked last year may be saturated now

Related Skills

• kdp-keyword-optimizer - Optimize the 7 backend keyword slots
• book-description-writer - Write conversion-optimized descriptions
• kdp-launch-checklist - Pre-publish validation

Category selection is a strategic decision. 3 slots, 27% ghosts, permanent choice. Research before you publish.