Lower Amazon ACoS by diagnosing the cause first. Stop throwing money away, adjust your bids, tighten your targeting, optimize your listing to drive conversions, and regularly review your search terms. A high ACoS could be due to aggressive launch spending, expensive clicks, poor conversion rates, or irrelevant traffic, not necessarily a poorly performing campaign.
The mistake many sellers make is cutting bids too quickly. That can reduce spend, but it can also reduce visibility, sales, and ranking momentum. A better approach is to diagnose the cause first, then fix the exact lever creating waste.
Why Is My Amazon ACoS So High?
Amazon ACoS becomes high when your ad spend is too large compared to the revenue those ads generate. Amazon defines ACoS as ad spend divided by ad revenue, multiplied by 100. So every ACoS issue comes back to two things: how much you spend and how much revenue that spend creates.
Before changing bids, start by looking at three areas: targeting, bidding, and conversion.
If targeting is too broad, your ads may reach shoppers who are not ready to buy. That creates clicks without enough orders. If you bid too high, you will pay more per click, but you might not get more sales. If the product isn't converting well, people will click the ads.
Use this table to figure out where the problem starts.
| Cause | What It Looks Like | First Fix |
|---|---|---|
| Broad targeting | Clicks from irrelevant terms | Add negatives |
| Bids too high | High CPC, weak sales | Tune bids to target ACoS |
| Poor conversion | Clicks but few orders | Fix listing and offer |
| Wrong match types | Spend spreads too widely | Separate exact, phrase, broad |
| Weak search relevance | Traffic does not match product | Refine keyword targeting |
| Poor campaign structure | No clear winners or losers | Restructure campaigns |
Do not treat every high ACoS campaign the same way. First, you need to figure out what is actually happening with your high ACoS campaign.
- If it spends a lot and gets no orders, cut the waste.
- If it gets orders but ACoS is too high, adjust bids slightly.
- If it gets clicks but no purchases, fix the listing before touching ads.
The first step is simple: find whether the problem is bad traffic, expensive traffic, or weak conversion.
What Is a Good ACoS on Amazon?
There is no โgoodโ Amazon ACoS. Amazon advises setting a target based on the break-even margin and campaign objectives instead of a particular percentage. Users can refer to the category-specific benchmark reports issued by Amazon Ads for the year 2026 to evaluate their performance against similar brands. Nevertheless, the company does not offer any figures for acceptable or unreasonable ACoS across all advertising campaigns.
The given metric should be matched to the productโs margin, lifecycle, conversion rate, and campaign goals to define the most optimal level for each case. For example, a campaign with an established product with a good rank and extensive review coverage requires a lower ACoS to reach a profitable level. On the contrary, a brand-new product launch might need a higher-than-average ACoS to build the necessary data and increase the itemโs rank.
| Goal | ACoS Direction | What It Means |
|---|---|---|
| Profit-focused campaign | Lower than target ACoS | Mature product, controlled spend |
| Launch campaign | Higher ACoS may be acceptable | Short-term ranking/data goal |
| Brand defense | Moderate ACoS | Protect branded search terms |
| Competitor targeting | Higher ACoS risk | Use only with clear strategy |
| Seasonal push | Flexible ACoS | Watch margin and inventory |
Your break-even ACoS is linked to your profit margin. Amazon explains that to maintain profit, ACoS should be lower than your profit margin.
Calculate Break-Even and Target ACoS
Start with the economics of one unit:
| Item | Example |
|---|---|
| Selling price | $40 |
| Amazon referral and fulfillment fees | $12 |
| Product and landed cost | $14 |
| Other variable costs | $2 |
| Contribution before advertising | $12 |
| Break-even ACoS | 30% |
Break-even ACoS is calculated by dividing contribution to sales by the sale price. In this case,
- $12 รท $40 = 30%
Thus, if the company wants to maintain $4 profit per order after advertising costs, it will have only $8 for ad spending, i.e.,
- $8 รท $40 = 20% ACoS.
For each SKU, use the fees, cost of goods sold, any discounts, returns, and fulfillment costs to calculate break-even ACoS. Similarly, Amazon calculates break-even ACoS based on profits. Plugging in numbers is not enough; using ACoS as a benchmark should be just one part of a wider performance assessment strategy.
How to Lower Your Amazon ACoS: 9 Proven Tactics
Lowering ACoS is not a single quick bid change. Start with wasted spend, then move through bids, match types, campaign structure, listing conversion, and search term reports.
Add Negative Keywords to Cut Wasted Spend
Negative keywords are important because they stop your wasted spend from showing when people search for terms unrelated to what you are trying to sell.
Negative keywords prevent ads from appearing for search queries that are irrelevant, commercially unsuitable, or consistently unprofitable. They help concentrate spend on searches that match the product and campaign goal, but they should be added only after checking relevance, spend, clicks, orders, and data sufficiency.
This helps you save money by avoiding ads that people are not interested in. You can spend smarter and see better outcomes.
To get started, you should look at the Search Term Report. Check for things like:
- Irrelevant terms
- High-spend terms with no orders
- Broad research terms that do not convert
- Competitor terms with poor sales
- Search terms that do not match the product use case
Using a 30-60 day report if the account has sufficient activity, or a shorter time frame for quick launches or seasonal products. Calculating the percentage of wasted spend as a ratio of non-converting or irrelevant search-term spend to total search-term spend. Filtering terms with sufficient frequency or spend to have a meaningful impact on the decision, based on the productโs breakeven CPA
Followed by an n-gram analysis of recurring 1-3 word phrases within the non-converting group. Individual terms or phrases that appear several times within the non-converting queries may indicate a pattern of wasteful spend that should be paused or added with phrase/exact match negatives. Terms that are clearly unrelated to the offer or campaign objective should be filtered out immediately.
Tune Bids to Your Target ACoS
Bid changes should be driven by target ACoS, data sufficiency, and campaign objective, not reactions to day-to-day fluctuations. Only decrease a keywordโs bid if it has sufficient data (clicks, spend, and orders), and itโs significantly above your target ACoS. If itโs below target with stable conversions, leave the bid where it is or test a small increase to capture more conversions at a lower ACoS.
A simple bid review process:
- Sort targets by spend.
- Review how much you're clicking, ordering, and what ACoS is.
- Compare it to a target ACoS.
- Decide which targets are being wasteful and lower their bids.
- Protect which targets are profiting.
- Do this review again after the next set of data has been collected.
And try not to lower all of your bids at once. Protect profitable search terms and make target-level changes first; use the broader guide to reduce PPC costs for additional cost-control tactics.
Fix Match Types
Amazon's match types decide when your ads appear. Go too broad, and your budget burns through quickly on all kinds of searches. Go too narrow with exact matches, and you miss out on potential customers. The right balance depends on your budget and goalsโa broad match gives you reach but can be costly, while exact match keeps you targeted but limits visibility. Choose the match type based on your product and the result you want.
Use different match types for different purposes:
- broad match is good for discovery and keyword mining;
- phrase match is great for controlled expansion;
- exact match is suitable for known, high-converting terms.
- Product targeting is good for ASIN or category placement.
If one query is getting you consistent, profitable orders, consider moving it to a separate exact campaign or ad group with its own budget and bid multipliers. In such cases, you should also consider adding the query as a negative exact in the original campaign, if applicable, to improve the performance and attribution accuracy of your other terms. Exact match is not a magic wand that makes keywords perform better by default, but rather a way to have more control and structure over your budget, bidding, and reporting.
The idea is not to stop using broad matches. The main thing is to make sure broad matches don't take over the account. Use search terms strategically so you get the best results. Have a better handle on your search terms.
Improve Listing Conversion Rate
ACoS falls when ad-attributed revenue grows faster than advertising spend. Improving listing conversion can produce more orders from the same traffic and spend, increasing attributed revenue without requiring proportionally higher media costs.
If people are clicking your ads but not actually buying anything, you should review your product listing before deciding to spend money on ads.
Review:
- Main image
- Title clarity
- Review count and rating
- Price competitiveness
- Coupon or offer visibility
- A+ Content
- Bullet points
- Buy Box health
- Inventory availability
- Variation structure
A weak product page can really hurt you. If people click your ad but do not trust what they see on the product page, your ACoS will remain high even if you change your bids.
When the listing converts more effectively, the same advertising spend can generate more attributed revenue. This lowers ACoS without removing useful traffic or weakening profitable campaign coverage.
Restructure Campaigns by Goal
Campaign structure determines whether advertisers can isolate performance and make accurate bid, budget, and ACoS decisions. Combining branded terms, launch targets, competitor ASINs, and broad research keywords in one campaign hides meaningful differences in intent, cost, and profitability.
When viewed in aggregate, these trends are not informative, so it is vital to distinguish one from another if you want to gain an accurate perception of what is happening with your campaign. Maintaining the integrity of the structure is essential to analyze the situation correctly.
Separate campaigns by purpose:
| Campaign Type | Goal | ACoS Expectation |
|---|---|---|
| Branded | Protect own brand terms | Usually efficient |
| Exact non-branded | Capture proven demand | Target-controlled |
| Broad research | Find new search terms | Higher, controlled budget |
| Competitor targeting | Test conquesting | Higher risk |
| Launch | Build data and visibility | May run above target short-term |
| Product targeting | Defend or conquest ASINs | Depends on competition |
This makes budget decisions cleaner. For example, you can reduce spend in research campaigns without hurting proven terms in exact campaigns.
Moreover, it is critical to consider low-hanging opportunities before scaling up ad spending. For example, there may be keywords not being bid on yet that the product is already ranking organically for - launching exact match PPC campaigns around these terms will help determine if they are worthy of being bid on. Similarly, the All Sold Products report can highlight ASINs with revenue-generation potential; if products are selling without being bid on, it may be time to allocate more budget toward their promotion or analyze their performance as a separate profitability segment.
Use Dayparting to Control Waste
Since Amazon Sponsored Ads do not offer native hourly scheduling for Sponsored Products, dayparting typically requires third-party software or automation built on Amazon Marketing Stream.
Dayparting means adjusting ad activity by time of day or day of week. It can help when spending is repeatedly high during low-conversion periods.
You should only use dayparting when you have campaign data to spot meaningful hourly patterns. If you do not have activity in your campaign data trends, your campaign data is unreliable.
Analyze:
- Hours with high spend and low conversions
- Days with poor conversion
- Budgets that get eaten up by the end of the day or time of the day before the best-buying hours.
- Time slots where the campaign performs better than average
Use dayparting only after you have optimized your targeting, bids, and match types. You have sufficient data about how the campaign performs hourly to identify patterns that can be repeated.
Reallocate Budget to Winners
To lower ACoS, it is crucial to reallocate funds from unprofitable targets to profitable ones. Every week, advertisers should analyze the list of:
- Low ACoS keywords;
- ASINs with stable order volume;
- High-converting campaigns;
- High-profit placements;
- Exact match terms that need more budget
So we need to reallocate the budget from the targets that are not doing well to the ones we know are working.
We should do this slowly. If we cut the budget for the targets too quickly, we might miss out on important sales information. The main thing we want to do is move the budget in a controlled way, not just make cuts all at once.
Refine Keyword Targeting
Search terms can signify different degrees of purchase intent. Informational searches may suggest that the customer is in the research phase; comparative searches may suggest that a customer is comparing options. In contrast, searches for specific items may be a clear buying signal. This affects how much one is willing to bid, as well as the expected ACoS.
For example:
- โcoffee makerโ is broad.
- โSingle serve coffee maker for a small kitchenโ is more specific.
- โbrand name single serve coffee makerโ may be high intent.
Long-tail keywords are typically characterized by low search volume; however, they usually bring in high-quality traffic. This is because the buyerโs intent behind such keywords is often more specific. In terms of ACoS, high-quality traffic is more important than anything else. By using long-tail keywords, you can ensure that your ads are shown to the exact type of customers you need.
Focus on keywords that match:
- Product type
- Use case
- Size, material, flavor, or variation
- Buyer problem
- High-intent modifiers
- Category terms that closely fit the product
Better targeting reduces spend on shoppers who were unlikely to buy anyway. As a result, your ACoS can improve without unnecessary traffic.
Monitor Search Term Reports Weekly
Amazon Search term reports are where ACoS control becomes a habit. They turn weekly checks into a repeatable process for finding what to fix next.
Review active campaigns every week. Look at:
- Spend
- Clicks
- Orders
- ACoS
- CPC
- Conversion rate
- Search relevance
- Match type
- Placement performance
Review top-of-search, rest-of-search, and product-page placements separately. If top-of-search converts profitably at or below target ACoS, test a controlled placement increase while keeping the base bid stable. If a placement has high CPC and weak conversion, reduce its placement modifier or lower the base bid affecting that traffic. Product-page placements should be evaluated independently because lower CPC does not guarantee profitable conversion. Change one placement lever at a time and compare the next equivalent data cycle.
This is one of the most important routines for controlling ACoS.
How to Lower ACoS Automatically With Tools and Automation
Amazon PPC automation tools can help identify waste, apply bid rules, monitor budgets, and flag anomalies more consistently. Still, automation should remain tied to margin, target ACoS, campaign objective, and sufficient data.
Use automation to spot problems faster and apply rules more consistently.
| Automation | What It Helps With | Human Check Needed |
|---|---|---|
| Bid rules | Adjust bids toward target ACoS | Confirm margin and goal |
| Negative keyword alerts | Flag waste | Check relevance |
| Budget alerts | Stop overspend | Check campaign purpose |
| Placement rules | Control top-of-search spend | Review conversion quality |
| Dashboards | Spot ACoS spikes | Decide next action |
For example, an automation rule can flag a search term that has accumulated heavy spend. But a person should still check whether the term is relevant, whether the campaign is in launch mode, and whether the term has enough clicks to judge fairly.
Good automation should help answer:
- Which campaigns are above target ACoS?
- Which search terms are wasting?
- Which bids changed recently?
- Which products are out of stock?
- Which budgets are running out too early?
- Which campaigns need manual review?
For example, an automation rule can flag a search term that has accumulated substantial spend without generating an order. A person should still confirm its relevance, campaign stage, and data sufficiency before lowering the bid or adding a negative.
Do not trust a tool that promises to lower ACoS without understanding your margin, product lifecycle, and campaign goals. Automation can reduce delay, but human judgment prevents bad cuts.
How Long Does It Take to Lower ACoS?
Some ACoS fixes show up quickly. Others need more data.
Obvious waste can often be found in the first week. Stronger keyword and placement signals usually need two to four weeks. Larger changes, like listing conversion improvements or campaign restructuring, may take 30 to 60 days to show a clearer pattern.
| Timeframe | What to Expect |
|---|---|
| First 7 days | Obvious irrelevant traffic, budget problems, or severe bid issues in sufficiently active campaigns |
| 2โ4 weeks | More stable keyword, search-term, and placement patterns |
| 30โ60 days | Better evidence on conversion changes, restructuring, and budget reallocation |
| 60+ days | Broader TACoS, organic-sales, and repeat-demand effects |
Note: the time it takes to see changes depends on many factors, including the level of competition, the cost-per-click (CPC), the conversion rate, seasonality, and the size of the change. Thus, high-spend queries with low relevance will become apparent in just a few days. In contrast, changes to the budget, placements, and keywords usually take several cycles of conversions to show results. Most optimization efforts related to improved ranking require a longer evaluation period. The numbers below should be used as a reference point only.
A good rule: make clear changes, give the account enough time to respond, then adjust again. Test one major lever at a time whenever practical. Record the original setting, date, hypothesis, and success metric; hold other significant variables stable; wait for a sufficient and comparable data cycle; then compare ACoS, orders, CPC, conversion rate, and sales. This makes it easier to identify whether a bid, placement, targeting, or listing change caused the result.
When Should You Accept a Higher ACoS?
Lower ACoS is not always the right goal. Some campaigns are built for growth, not immediate efficiency. Amazon also notes that ACoS should not be the only campaign metric because campaign goals and conditions can vary.
| Scenario | Why Higher ACoS May Be Okay | Guardrail |
|---|---|---|
| Product launch | Builds data and ranking | Set a time limit |
| Ranking push | Supports keyword visibility | Track organic lift |
| Brand defense | Protects branded terms | Watch CPC creep |
| Seasonal push | Captures demand spikes | Watch margin and inventory |
| Competitor targeting | Tests new audiences | Limit budget |
Higher ACoS is only a problem if you have no plan. A new product launch may have high ACoS for a few weeks to gather data; that is fine. But if ACoS stays high for months with no ranking improvements, no conversion increases, and no justification, you need to adjust. Long-term high ACoS without results is just wasted. You have to control ACoS to reach your goals.
Accept higher ACoS only when the business reason is clear, and the guardrail is defined.
When to Get Expert Help
You may need help from an Amazon advertising agency when your ACoS keeps rising even after cutting bids. That usually means the issue isn't one keyword or campaign; it could be account structure, product-market fit, irrelevant search terms, data analysis, or overall planning. ACoS problems often need a broader review. This metric is critical to your campaign success.
Use this checklist:
- ACoS is rising even after bid cuts.
- Search term reports are not being reviewed weekly.
- Campaigns do not have clear goals.
- Automation is making changes without strategy.
- Listing conversion is weak.
- The team cannot tell which spend is profitable.
- Launch and profit campaigns are mixed.
- Budgets run out before profitable terms get traffic.
In accounts SalesDuo manages, the fastest ACoS gains often come from removing high-spend irrelevant traffic before reducing bids on proven converting terms.
Need a structured plan to lower your ACoS without cutting profitable sales?
Book a 1:1 growth call with SalesDuo.
Frequently Asked Questions
What is a good ACoS on Amazon?
A good ACoS depends on your margin, product lifecycle, category, and campaign goal. Amazon says there is no single good ACoS because it varies by business and campaign context. A mature profit-focused product usually needs a lower ACoS than a launch campaign.
Why is my ACoS suddenly high?
ACoS can rise suddenly when CPCs increase, conversion rates drop, competitors become more aggressive, broad keywords start spending, inventory changes, or the listing loses conversion strength. Check search terms, bids, placement data, Buy Box health, reviews, pricing, and recent listing changes before cutting spend.
Does lowering ACoS reduce sales?
Lowering ACoS can reduce sales if you cut bids unthinkingly or pause profitable keywords. The goal is not to remove all spending. The goal is to remove wasted spend, protect converting terms, improve listing conversion rates, and tune bids to target ACoS.
What is the difference between ACoS and ROAS?
ACoS shows ad spend as a percentage of attributed ad sales, while ROAS shows attributed revenue generated per advertising dollar. The two metrics are mathematical inverses. Read the full ACoS vs ROAS comparison for broader guidance.
How often do I check my search term reports?
Check search term reports weekly for active campaigns. During launches, seasonal pushes, or aggressive ranking campaigns, review them more often. Weekly reviews help you add negative keywords, move winning terms into exact matches, adjust bids, and prevent wasted spend.
Can automation lower Amazon ACoS?
Automation can help lower ACoS when rules are based on margin, target ACoS, campaign goals, and enough data. It can flag waste, adjust bids, and alert teams faster. But human review is still needed to avoid cutting valuable traffic.
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.
