Amazon A9/A10 Algorithm Explained

Core Objective

Maximize purchase probability for every search.

Primary Factors

1. Conversion Rate (most important) - high CVR = product satisfies intent
2. Sales Velocity - last 7 days weigh most heavily
3. Keyword Relevance - Title > Bullets > Search Terms

Secondary Factors

4. CTR - improve with images, pricing, reviews
5. Review Quality - 4.0+ is positive
6. Inventory - stockouts cause sharp drops

Tertiary Factors

• Seller performance
• FBA advantage
• External traffic (increasingly important)

Stage-Based Strategy

• Launch: listing completeness + PPC + initial reviews
• Growth: ad optimization + A/B testing
• Maturity: maintain ranking + profit optimization

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Great products + great experience = great rankings.