Every time a shopper types something into Amazon's search bar, an auction happens in milliseconds. Hundreds of sellers bid to have their products shown first. Amazon decides who wins based on a combination of your bid, your ad's relevance score, and how well your listing converts. The seller with the highest bid does not always win.
The seller with the best product-to-search-term match and the strongest listing often does. Understanding this system is the difference between running Amazon ads profitably and watching your ad spend disappear.
In this guide, weโll explain exactly how Amazon ads work, including the auction mechanism, ad rank factors, campaign types, and bidding logic.
How the Amazon Advertising Auction Actually Works
The easiest way to understand Amazon ads is to first understand the auction. Every ad placement starts with a real-time auction.
When a shopper searches on Amazon, the platform quickly identifies all eligible advertisers to compete for that query. It then determines which ads appear and where they are placed on the page.
Most Amazon ads use a cost-per-click (CPC) model. This means you only pay when someone clicks your ad, not when they simply see it.
Your bid tells Amazon the maximum amount you are willing to pay for a click. However, your bid is only one factor in the auction.
A simple way to think about Amazon ad rank is this:
Ad Rank = Bid + Relevance + Expected Performance
Amazon looks at:
- Your bid โ the maximum amount you are willing to pay for a click.
- Relevance โ how closely your product matches what the shopper searched for.
- Expected performance โ how likely shoppers are to click and buy based on your listing quality, reviews, pricing, and previous conversion history.
Amazon is optimizing for shopper relevance and expected revenue, not simply rewarding the highest bid.
This is why two sellers bidding different amounts can still end up with very different results.
Why the Highest Bidder Does Not Always Win
Many new sellers assume Amazon rewards the biggest advertiser. That is not how the system works.
Amazon wants shoppers to find products they are likely to buy. Because of that, relevance matters almost as much as the bid itself.
Consider this example:
Search term: Organic Protein Powder
Although Seller B has the higher bid, Seller A can still secure the ad placement because Amazon expects more shoppers to engage with and purchase Seller A's product.
How Much Does the Winner Pay?
Amazon did not publicly disclose the exact formula used to calculate the final cost per click (CPC). According to Amazon Ads documentation, the amount you pay is determined by the auction and can be influenced by your adjusted bid and other auction factors.
A simplified way to think about it is that winning an auction does not always mean paying your maximum bid. For example, if Seller A bids $2.00 and Seller B bids $1.50, Seller A may win the placement and pay approximately $1.51 rather than the full $2.00.
The exact CPC can vary based on relevance, placement adjustments, competition, and other auction signals.
Key Takeaway
Amazon's advertising system rewards relevance, not just budget.
The most successful advertisers combine strong listings, relevant keywords, competitive products, and smart bidding strategies.
The 4 Amazon Ad Types: What Each One Does and When Sellers Use It
Amazon offers four main advertising options. Each is designed for a different goal and stage of growth.
Most sellers start with Sponsored Products. As brands grow, they typically expand into Sponsored Brands, Sponsored Display, and Amazon DSP, depending on their goals and budget.
Sponsored Products: The Foundation of Amazon Advertising
Sponsored Products are usually the first advertising format sellers try on Amazon. They promote individual product listings and can be shown in both search results and product detail pages.
To shoppers, Sponsored Products look almost identical to regular listings. The main difference is the small "Sponsored" tag that identifies them as paid placements.
Sellers can run Sponsored Products campaigns using keywords, products, or Amazon's automatic targeting options. Since Brand Registry is not required, they are usually the simplest and most accessible way for sellers to start advertising on Amazon.
To serve Sponsored Products ads effectively, products should be in stock, meet Amazon's advertising eligibility requirements, and typically be eligible for Featured Offers.
Sponsored Products campaigns can be run either automatically or manually. Automatic campaigns allow Amazon to match ads to relevant search terms and products, while manual campaigns give advertisers control over keyword and product targeting. Most sellers use a combination of both to discover new opportunities and improve performance over time.
Example Use Case
A seller launching a new water bottle could use Sponsored Products to appear when shoppers search for "stainless steel water bottle," "insulated water bottle," or "sports water bottle."
Sponsored Brands: Promote Your Brand, Not Just One Product
Sponsored Brands help shoppers discover your brand, not just a single product.
These ads typically appear near the top of Amazon search results and include your brand logo, a custom headline, and multiple products. Brand Registry is required.
They work best for brands with several related products that want to increase awareness across their catalog.
Sponsored Brands also give brands access to Amazon Brand Stores, which are customizable storefronts that let you organize products, highlight collections, and create a more engaging shopping experience.
Example Use Case
A supplement company selling protein powder, pre-workout, and vitamins can use Sponsored Brands to showcase all three in one ad, introducing shoppers to the entire brand rather than driving traffic to a single listing.
Sponsored Display: Reach Shoppers On and Off Amazon
Sponsored Display helps sellers reconnect with shoppers who have already shown interest in their products.
Unlike other sponsored ad formats, Sponsored Display can show ads to shoppers both on Amazon and across external digital properties connected to Amazon's advertising network.
Sponsored Display is available to professional sellers enrolled in Amazon Brand Registry, as well as vendors, authors, and agencies that meet Amazon Ads eligibility requirements.
Where Sponsored Display Ads Appear
- On product detail pages
- In Amazon placements
- On third-party websites
- Across Amazon's advertising network
Example Use Case
A shopper views a coffee maker but leaves without purchasing.
Sponsored Display can show that shopper ads for the same coffee maker on other sites, encouraging them to return and complete the purchase.
Amazon DSP: Programmatic Advertising at Scale
Amazon DSP (Demand-Side Platform) is Amazon's programmatic advertising platform for buying display, video, and streaming TV ads using Amazon audience data.
It is primarily used by larger brands focused on awareness, audience targeting, and retargeting at scale. Most sellers should focus on Sponsored Products and Sponsored Brands before considering DSP.
How Amazon Decides Which Ads to Show: Relevance, Bids, and Conversion History
Winning an Amazon ad auction is not just about bidding more. Amazon also wants to show shoppers products they are likely to click and buy.
To make that decision, Amazon evaluates three main factors: relevance, bid amount, and expected performance.
Relevance Comes First
Amazon wants to match shoppers with products that fit their search. If someone searches for "organic protein powder," Amazon prefers products that clearly match that term.
Amazon evaluates relevance using:
- Product title
- Bullet points
- Product description
- Backend keywords
- Category placement
- Product attributes
Your Bid Still Matters
Higher bids can improve visibility, especially in competitive categories.
However, a highly relevant product with a lower bid can often outrank a less relevant product with a higher bid.
Bid is important, but it is never the only lever.
Conversion History Influences Future Performance
Amazon wants ads that generate sales.
If your product consistently receives clicks and converts into purchases, Amazon gains confidence in showing it more often.
This is one reason why improving your product listing can sometimes have a bigger impact than increasing your bid.
Listing Quality Affects Ad Performance
Amazon predicts how shoppers will react to your listing before showing the ad.
Several factors influence this prediction:
- Main image quality
- Product title clarity
- Review count and star rating
- Pricing competitiveness
- Delivery speed (Prime eligibility)
- Previous conversion performance
Placement Types Matter Too
Amazon offers three primary placement types:
- Top of Search: Highest visibility and typically the most expensive placement.
- Rest of Search: Within the results page.
- Product Pages: On competitor or related product listings.
Top-of-search placements usually generate the most visibility and clicks.
Product page placements can sometimes produce lower CPCs while still driving strong conversions.
Advertisers often set different bid adjustments for each placement type.
This is why two sellers bidding the same amount can still receive different ad positions. Amazon is optimizing for expected revenue per impression, not simply rewarding the highest bid. A product with greater relevance and a stronger track record of generating clicks and sales can outperform a competitor with a similar bid.
Key Takeaway
Amazon does not simply reward the highest bidder.
It rewards products that combine strong relevance, competitive bids, and proven conversion performance.
Amazon PPC Metrics Explained: What to Track and What They Mean
Amazon provides extensive advertising data, but not every metric carries the same weight.
The benchmarks below are typical ranges and can vary significantly by category, competition, price point, and listing quality. Understanding these core metrics helps sellers identify what is working and where improvements are needed.
For more category-specific performance data, see our Amazon advertising benchmarks guide.
CPC (Cost Per Click)
Measures how much you pay, on average, for each click your ad receives.
CTR (Click-Through Rate)
Measures how often shoppers click after seeing your ad.
CVR (Conversion Rate)
Measures how many clicks turn into purchases.
ACoS (Advertising Cost of Sale)
Measures advertising spend as a percentage of ad-attributed revenue.
TACoS (Total Advertising Cost of Sale)
Measures advertising spend against total revenue, including organic sales.
ROAS (Return on Ad Spend)
Measures the revenue generated from advertising spend.
Key Takeaway
No single metric tells the whole story.
Strong Amazon advertisers look at CPC, CTR, CVR, ACoS, TACoS, and ROAS together before making decisions.
Automatic vs Manual Campaigns: Which Should You Run?
Most new sellers ask whether they should use automatic or manual campaigns.
For most accounts, the answer is both.
Each campaign type serves a different purpose.
Automatic and manual campaigns can run simultaneously, and many successful advertisers use both. However, relying solely on manual campaigns before you have sufficient search-term data can be risky, as keyword selection is often based on assumptions rather than actual shopper behavior.
Automatic Campaigns
Automatic campaigns let Amazon choose your targeting based on your listing content.
They are useful for discovering keyword opportunities you might not think to target manually.
Automatic campaigns work best for:
- New products and new advertisers
- Keyword discovery and data collection
- Understanding how Amazon matches your listing to search terms
Manual Campaigns
Manual campaigns allow you to take a more hands-on approach. You decide which keywords to target, how much to bid, and where you want your ads to appear.
They typically become more efficient after sufficient data has been collected.
Why Most Sellers Should Run Both
A common and effective workflow:
- Launch an automatic campaign.
- Collect data for 2โ3 weeks.
- Review the search term report.
- Identify converting keywords.
- Move winning keywords into manual campaigns.
- Add poor-performing terms as negative keywords.
This approach combines discovery with control.
How to Get Started with Amazon Advertising in 5 Steps
Getting started does not need to be complicated.
Follow these five steps to launch your first campaign correctly.
Step 1: Optimize Your Listing First
Advertising cannot fix a weak product listing. Before spending money, ensure your main image is strong, your title is clear, your bullets are informative, your reviews are competitive, and your price is reasonable.
Ads drive traffic. Your listing drives conversions.
Step 2: Set a Target ACoS
Your target ACoS should be based on profit margin. If your product margin is 35%, your break-even ACoS is also 35%.
Many sellers target an ACoS a few percentage points below break-even. During a launch, a higher ACoS is often acceptable while you build data and rankings.
Step 3: Start With One Product
Do not advertise your entire catalog immediately. Start with one product that already converts well organically.
This keeps performance easier to manage and understand as you build confidence.
Step 4: Launch an Automatic Campaign
Use a modest budget and focus on collecting useful search term data. The goal during the first few weeks is to understand how shoppers find your products before making significant optimization decisions.
For a more detailed campaign setup framework, see our guide on how to build your Amazon PPC strategy.
Step 5: Review Search Terms and Optimize
After 14โ21 days, review the search term report. Move strong keywords into manual campaigns with appropriate match types.
Add poor-performing or irrelevant terms as negative keywords. This is where campaigns typically begin to become more efficient.
Common Amazon Advertising Mistakes New Sellers Make
Most Amazon advertising mistakes are avoidable. Here are the most common issues.
Starting With Manual-Only Campaigns Before Having Keyword Data
Running manual campaigns is not a problem by itself. The risk comes from relying solely on manual targeting before you have enough search-term data. Without real shopper data, keyword selection often relies on assumptions, leading to missed opportunities and wasted ad spend.
Many successful advertisers run both automatic and manual campaigns, using automatic campaigns for discovery and manual campaigns for greater control.
Setting Bids Too Low
Some sellers set extremely low bids to avoid spending. The result is very few impressions and almost no traffic.
If your ads never enter auctions competitively, they cannot generate sales or the data needed to improve.
Judging Performance Too Quickly
Amazon advertising needs time. Most campaigns require two to three weeks before meaningful trends appear, and 30โ60 days to optimize properly.
Making major changes too early creates more problems than it solves.
Ignoring the Search Term Report
The search term report shows exactly where your money is going. Ignoring it is one of the fastest ways to waste advertising budget.
Strong advertisers review search terms regularly, at a minimum once every two weeks.
In our experience managing campaigns across hundreds of Amazon brands, new sellers often waste 20โ30% of their early advertising budget on irrelevant search terms simply because they do not review search term reports regularly. This is one of the fastest problems to identify and fix.
Advertising Products With Very Few Reviews
Ads drive traffic, but reviews generate trust. Products with very few reviews often struggle to convert as well as established competitors, resulting in higher CPCs and a higher ACoS.
Aim for at least 10โ15 reviews before investing meaningfully in paid traffic.
Using the Same Budget for Every Product
Not every product deserves the same investment. Higher-margin products often justify larger budgets.
Lower-margin products may require stricter ACoS targets and tighter controls to remain profitable.
Key Takeaway
Amazon does not cause most advertising problems.
Poor setup, weak listings, or inconsistent optimization cause them.
Avoiding these mistakes can save a significant amount of ad spend in the first few months.
If you're unsure where your spend is going, start with a free Amazon PPC audit.
Conclusion
Amazon ads work through a real-time auction, but success is not simply about spending more. Amazon evaluates bids, relevance, expected click behavior, conversion history, and listing quality before deciding which ads appear.
That is why strong Amazon advertising starts with a strong product listing and a clear understanding of how the auction works. Sellers who understand ad rank, ad formats, and key metrics such as CPC, CTR, CVR, ACoS, TACoS, and ROAS can make better decisions and improve profitability over time.
Ready to improve performance? Book a 1:1 growth call with SalesDuo.
Frequently Asked Questions About How Amazon Advertising Works
How do Amazon ads work?
Amazon ads work through a real-time auction. When a shopper searches on Amazon, eligible ads enter the auction and compete for placement. Amazon considers your bid, your adโs relevance to the search term, and the likelihood that shoppers will click and purchase before deciding which ads to show. Most Amazon ads use a cost-per-click model, so you only pay when someone clicks.
What are Sponsored Products, Sponsored Brands, and Sponsored Display ads?
Sponsored Products promote individual product listings and appear in Amazon search results and product detail pages. Sponsored Brands highlight your brand using a logo, custom headline, and multiple products, typically at the top of search results, and require Brand Registry. Sponsored Display helps you reach shoppers based on their browsing behavior, making it useful for retargeting and expanding visibility beyond Amazon search.
How much do Amazon ads cost?
Amazon ads typically use a cost-per-click (CPC) model. Sponsored Products CPCs often range from $0.81 to $1.20, although costs vary by category and competition. For a complete breakdown by ad type, category, and bidding strategy, see our Amazon advertising cost guide.
What is ACoS in Amazon advertising?
ACoS stands for Advertising Cost of Sale and is calculated as ad spend divided by ad-attributed revenue, multiplied by 100. For example, spending $100 to generate $400 in ad sales results in an ACoS of 25%. Your break-even ACoS usually matches your product profit margin, and many sellers target an ACoS 5โ10 percentage points below that level.
Should I use automatic or manual Amazon PPC campaigns?
Most sellers should use both. Automatic campaigns help Amazon discover relevant search terms and collect performance data, while manual campaigns give you more control over bids and keyword targeting. A common approach is to run automatic campaigns for 2โ3 weeks, move converting terms into manual campaigns, and add poor performers as negative keywords.
What factors determine which Amazon ads appear in search results?
Amazon looks at three main factors when deciding which ads to show. These include your bid, the relevance of your product to the shopperโs search, and the likelihood that shoppers will click and buy. Relevance comes from your listing content, while predicted performance is influenced by factors such as images, reviews, pricing, and conversion history.
Do I need Brand Registry to advertise on Amazon?
No. Any seller with a Professional Seller account can run Sponsored Products campaigns without Brand Registry. Brand Registry is required for Sponsored Brands and, for professional sellers, Sponsored Display campaigns. It also unlocks additional tools, including A+ Content, Brand Stores, and enhanced brand analytics.
What is a good ACoS for Amazon ads?
A good ACoS is usually below your productโs profit margin percentage. For example, if your margin before advertising is 35%, your break-even ACoS is 35%. Many sellers target an ACoS of 20% to 25% to be profitable. During product launches, a higher ACoS is often acceptable while visibility, sales history, and keyword data are being built.
About the Author
Meet Nandita Nair, an Associate Content Writer at SalesDuo, passionate about creating impactful content that helps Amazon businesses grow and thrive. When sheโs not writing, she finds joy in listening to music, exploring art, and getting lost in the world of novels.
