Every Amazon seller wants to rank on page one. But ranking is not luck — it is the output of a specific algorithm. Understanding how that algorithm works is the difference between shooting in the dark and running a systematic ranking programme.
Amazon’s search algorithm is commonly called A9 (after the subsidiary that built it). You may also hear “A10” — not an official Amazon name, but a community shorthand for the observed evolution of ranking factors over recent years. This guide explains both what the algorithm actually does and what you should do about it.
The Algorithm’s Only Goal: Revenue for Amazon
The most important thing to understand about Amazon’s algorithm is what it optimises for: the probability that a click leads to a purchase. Amazon is a retailer. It earns money when customers buy. The algorithm ranks products that are most likely to result in a completed sale — not the products with the most keywords, the highest bids, or the best images in isolation.
This is why every ranking factor ultimately connects back to one of two things:
- Relevance — is this product actually what the customer searched for?
- Performance — does this product convert when customers see it?
The Core Ranking Factors
Keyword Indexing
Whether your ASIN is indexed for a search term. If Amazon doesn’t know your product is relevant to a keyword, it cannot rank you for it. Driven by title, bullet points, backend search terms, A+ Content, and customer reviews.
Conversion Rate
The percentage of customers who buy after clicking. Amazon measures this continuously. A product converting at 25% will rank above one converting at 12% for the same keyword, all else equal. Driven by price, images, reviews, and listing quality.
Sales Velocity
How many units sell per day, per week. Volume of sales is a direct ranking signal. A product selling 20 units per day is seen as more relevant and popular than one selling 2 units per day, even at the same conversion rate. Velocity compounds — higher rank brings more traffic, more traffic brings more sales.
Title Optimisation
The product title is the highest-weighted listing field for keyword relevance. Your primary keyword should appear near the beginning of the title. Amazon parses titles word by word — every keyword in the title that matches a search query improves your relevance score for that query.
Click-Through Rate (CTR)
The percentage of search results page impressions that result in a click on your listing. Amazon measures this. A listing with a strong main image and competitive price earns a higher CTR, which signals relevance and quality to the algorithm.
Reviews & Star Rating
Review count and star rating directly affect conversion rate. They also act as an independent trust signal in the algorithm. Products below 3.5 stars see significant organic rank suppression. A product going from 10 to 100 reviews typically ranks substantially higher even without other changes.
In-Stock Rate
Going out of stock resets your ranking history for the affected keywords. Amazon cannot rank a product that is unavailable. Sellers who run out of stock frequently see their BSR and organic rank drop and struggle to recover the position when they restock.
PPC Sales Velocity
Sales generated through Sponsored Products ads count toward your overall sales velocity. They contribute to ranking, but organic sales are weighted more heavily than PPC sales in the A10 era. PPC is still valuable for ranking — especially on new launches — but is no longer a pure rank-buying mechanism.
What Changed with “A10”
A10 is not a rebrand or a product release — it is the industry’s way of describing the observed evolution in how the algorithm weights signals. The key shifts attributed to A10:
- Organic and external traffic weighted more heavily — sales driven by organic search rank and off-Amazon traffic (social, email, influencer) have a stronger ranking impact than pure PPC sales. This incentivises sellers to build a genuine brand and audience.
- Seller authority matters more — account health, customer satisfaction metrics, and seller feedback score increasingly influence rank. High-performing sellers get a ranking boost.
- Click-through rate is a stronger signal — A10 places more weight on CTR as an early engagement signal. Your main image and price have to earn the click before any of the other listing factors can convert it.
- Reviews are weighted differently — recent reviews are weighted more than old ones. A product with 50 reviews in the last 3 months may outrank one with 200 reviews that are all 18 months old.
Amazon does not publish its algorithm. “A10” is a label applied by practitioners to a set of observed ranking behaviour changes. Treat it as a useful framework, not a technical specification. What remains consistent: relevance + conversion + sales velocity = rank.
How to Improve Your Amazon Rank: Practical Steps
1. Fix Your Keyword Foundation
Use Brand Analytics (if brand-registered) or Helium 10 / Jungle Scout to identify the highest-volume, most relevant keywords for your main ASIN. Ensure they appear in:
- Your title (primary keyword near the front)
- Bullet points (secondary keywords woven in naturally)
- Backend search terms (up to 250 bytes — no repetition from title, no commas)
- A+ Content text modules (brand-registered sellers only)
2. Optimise for Conversion Rate
Ranking without converting is pointless — Amazon will simply stop ranking you. The highest-leverage conversion factors:
- Main image — must earn the click on the search results page. White background, product fills 85% of frame, hero angle that shows what the product actually is.
- Price — within a competitive range for the category. Outlier-high prices tank CTR and conversion simultaneously.
- Reviews — use every legal method to generate review velocity (see our reviews guide).
- Secondary images — lifestyle, infographic, size/dimension, use-case images that answer the questions a buyer has before purchasing.
3. Drive External Traffic for A10 Benefit
If you have social channels, an email list, or run Meta/Google ads, driving that traffic to your Amazon listing generates sales that carry extra ranking weight under A10 logic. Amazon’s Attribution programme lets you track off-Amazon traffic and in some cases earn a bonus on attributable sales.
4. Protect Your In-Stock Rate
Keep IPI score above 450. Set up low-stock alerts in Seller Central. For fast-moving ASINs, maintain at least 4–6 weeks of inventory at all times to avoid ranking resets during restocking lead times.
5. Use PPC to Accelerate Sales Velocity on Launch
On new product launches, use aggressive PPC to generate initial sales velocity. This builds the sales history that the algorithm needs to start ranking the ASIN organically. Use auto campaigns first to gather search term data, then migrate top-converting terms into manual exact campaigns.
Better rank → more impressions → more clicks → more sales → better rank. The algorithm rewards momentum. The goal is to enter this cycle for your target keywords. PPC is the accelerant; listing quality and review velocity are the fuel that keeps it going once organic rank is established.
What the Algorithm Cannot Be Gamed
Several tactics that worked in 2019–2021 are now either ineffective or dangerous:
- Keyword stuffing — repeating keywords in the title has diminishing returns past one clear instance. Amazon’s indexing is sophisticated.
- Review manipulation — fake reviews, review groups, and incentivised reviews are detected and result in account suspension, not ranking gains.
- Search-and-buy manipulation — paying people to search for your product and buy it. Amazon detects the behavioural pattern. Accounts suspended, rankings penalised.
- Excessive bid inflation — overbidding on PPC to drive PPC sales volume as a ranking shortcut. Works less than it used to under A10, and destroys profitability.
Want Better Organic Rank?
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