What Is the Amazon A9 Algorithm and How Does It Rank Listings?

The amazon a9 algorithm is the system that decides which products show up, and in what order, when someone searches on Amazon. Understanding what it actually looks at is the difference between guessing at optimization and doing it deliberately.

What A9 Is Actually Trying to Do

A9 isn't optimizing for keyword matching alone — it's optimizing for sales. Amazon's core incentive is showing shoppers the products most likely to convert, because that's what keeps buyers coming back to search on Amazon in the first place.

This means relevance gets a listing into consideration, but performance is what keeps it ranking well over time.

The Two Categories of Ranking Factors

Relevance Factors

• 👉 Keyword match in the title, bullet points, and backend search terms
• 👉 Category and product type accuracy
• 👉 Backend keyword fields filled in with relevant, non-redundant terms

Performance Factors

• 👉 Conversion rate — how often a listing view turns into a purchase
• 👉 Sales velocity — how consistently a product sells over time
• 👉 Customer reviews and ratings
• 👉 Price competitiveness relative to similar listings
• 👉 Inventory availability — listings that go out of stock lose ranking momentum

A perfectly keyword-optimized listing with poor conversion will still rank behind a less-optimized one that consistently sells.

Why Keywords Alone Aren't Enough

This is where a lot of sellers get stuck: they optimize the title and backend keywords thoroughly, see a short-term ranking bump, and then watch it fade because the listing isn't converting once shoppers actually click in.

• ✅ Strong keyword relevance gets you into the search results
• ✅ Strong conversion keeps you there and pushes you higher over time
• ❌ Relevance alone, without conversion, doesn't sustain rankings

What This Means for Your Listing Strategy

Optimizing for A9 means treating the listing as a full package, not just a keyword container.

• 👉 Get the keyword relevance right in title, bullets, and backend terms
• 👉 Then focus equally on the elements that drive conversion — clear photos, honest descriptions, and competitive pricing

Running your listing content through the Rankivo SEO Score Checker helps confirm the keyword relevance side is solid, so you can focus your remaining effort on the conversion factors A9 rewards over time.

Conclusion

The amazon a9 algorithm rewards listings that combine keyword relevance with real sales performance — not one or the other. Getting the keywords right earns visibility; getting the listing itself right is what keeps that visibility from fading. For the full listing optimization process, see our guide on how to optimize Amazon listings that rank.

FAQ

Is Amazon's ranking algorithm still called A9?

Amazon's search ranking system is commonly referred to as A9, developed by Amazon's search technology division. The underlying system has evolved over time, but the term is still widely used to describe how Amazon ranks search results.

Does conversion rate really affect Amazon rankings?

Yes. Amazon's ranking system factors in how often a listing converts views into sales, since Amazon's core incentive is surfacing products likely to sell, not just products that match keywords.

Can a well-optimized listing still rank poorly on Amazon?

Yes, if it doesn't convert well or has issues like inconsistent inventory, weak reviews, or uncompetitive pricing. Keyword optimization gets a listing into consideration, but performance factors determine whether it stays ranked.