Every Amazon seller who runs ads ends up asking the same question: is my ACoS good? The honest answer is that it depends on your margin and on what you want the ads to do. But “it depends” isn’t useful on its own, so this guide gives you real numbers to compare against and a formula to set your own target.
The short version
- ACoS is ad spend divided by ad sales. TACoS is ad spend divided by total sales. ACoS tells you how efficient your ads are. TACoS tells you what ads cost the whole business.
- Across the 198 largest US accounts in Sophie Hub in September 2026, the median ACoS was 37.2% and the median TACoS was 19.2%.
- There is no universal “good ACoS”. Yours should sit below your break-even ACoS, which comes from your margin. The formula is below.
- Judge ads on TACoS and profit, not ACoS alone. A rising ACoS can be the right move if it’s buying organic rank.
In this guide
- What ACoS Means and How to Calculate It
- ACoS vs. TACoS: Which One to Watch
- 2026 Benchmarks: ACoS, TACoS and CPC from 198 US Brands
- Why a Low ACoS Can Be a Bad Sign
- What Good Looks Like at Each Stage
- How to Find Your Break-Even ACoS
- How to Set Your Target ACoS
- How to Lower ACoS Without Losing Sales
- FAQ
1. What ACoS Means and How to Calculate It
ACoS stands for advertising cost of sale. It’s the share of your ad-driven sales that you spent on ads.
ACoS = ad spend ÷ ad sales × 100
If you spent $300 on Sponsored Products last week and those ads brought in $1,000 in sales, your ACoS is 30%. For every dollar of sales the ads produced, you paid 30 cents for the clicks.
ROAS (return on ad spend) is the same number turned upside down: ad sales ÷ ad spend. A 30% ACoS is a ROAS of 3.3. Amazon shows ACoS in Seller Central and ROAS in some other reports, so it helps to know both.
| ACoS | ROAS | What it means |
|---|---|---|
| 10% | 10.0 | $10 of sales for every $1 of ads |
| 20% | 5.0 | $5 of sales for every $1 of ads |
| 25% | 4.0 | $4 of sales for every $1 of ads |
| 33% | 3.0 | $3 of sales for every $1 of ads |
| 50% | 2.0 | $2 of sales for every $1 of ads |
Two things to keep in mind when you read your ACoS:
- Ad sales are attributed, not exact. Amazon credits a sale to an ad if the shopper clicked the ad within a set window before buying. Some of those shoppers would have bought anyway, and some ad clicks lead to sales Amazon doesn’t credit.
- The last few days are always incomplete. Sales keep getting attributed for days after the click. Judge ACoS on a full week or longer, never on yesterday.
2. ACoS vs. TACoS: Which One to Watch
TACoS stands for total advertising cost of sale. Instead of dividing ad spend by ad sales, you divide it by all your sales, organic included.
TACoS = ad spend ÷ total sales × 100
Using the same week: $300 of ad spend, $1,000 of ad sales and $1,500 of organic sales gives a TACoS of $300 ÷ $2,500 = 12%.
The two numbers answer different questions:
| ACoS | TACoS | |
|---|---|---|
| Question it answers | Are my ads efficient? | What do ads cost my business? |
| Includes organic sales | No | Yes |
| Best used for | Comparing campaigns, keywords and bids | Judging the whole account and its profit |
| Warning sign | Rising while sales stay flat | Rising month after month |
TACoS is the one that shows whether ads are building something. When ads push a product up the search results, organic sales rise and TACoS falls, even if ACoS stays the same. When TACoS keeps climbing, the business is renting more of its sales every month.
One supplement brand we worked with made this switch on purpose. “We switched success metrics from ACoS to TACoS, and began investing where blended results improved,” the team wrote. The brand accepted short-term ACoS increases on its most valuable searches, organic rank rose, and revenue doubled in four months, reaching its first seven-figure month. Read the case study
3. 2026 Benchmarks: ACoS, TACoS and CPC from 198 US Brands
Most ACoS benchmarks online come from surveys or tool vendors’ marketing pages. These come from account data. We looked at the 198 largest US-marketplace accounts connected to Sophie Hub, Sophie Society’s analytics platform, in September 2026. Each spent $5K/Month or more on Amazon ads.
| Metric | Bottom 25% | Median | Top 25% |
|---|---|---|---|
| ACoS | 47.9% | 37.2% | 27.2% |
| TACoS | 24.8% | 19.2% | 14.0% |
| Cost per click | $1.96 | $1.33 | $0.88 |
| Click-through rate | 0.50% | 0.65% | 0.77% |
| Ad conversion rate | 7.7% | 12.9% | 18.7% |
| Ad sales as a share of total sales | 65% | 54% | 41% |
For ACoS, TACoS, cost per click and ad share, “top 25%” means the lowest values.
What stands out:
- A median ACoS of 37.2% is higher than most sellers expect. Many guides still quote 25 to 30% as “average”. In this data, an ACoS under 27% put an account in the best quarter.
- Nearly a quarter of accounts ran above 50% ACoS. 45 of the 198 did that for the month. Some were launching or pushing rank on purpose. Others were simply losing money on ads.
- TACoS spread was wide. 87 accounts (44%) ran TACoS above 20%. Only 26 (13%) were under 10%.
- The median account got 54% of its sales from ads. That’s the number we’d watch most closely. Our target for a mature product is closer to 20% of sales from ads and 80% organic. When more than half your sales depend on ad spend, every sale carries an ad cost, and the day you cut spend, sales fall with it.
Across every US store connected to Sophie Hub, not just the largest, ads drove 34.5% of sales at a blended 30.6% ACoS and $1.17 per click.
These are accounts connected to Sophie Hub, not only accounts we manage, and they cover many categories. Treat them as a market reference, not a target. Your own target comes from your margin, which is section 6.
4. Why a Low ACoS Can Be a Bad Sign
A low ACoS feels like success. Often it means the opposite: the ads are only reaching shoppers who were going to buy anyway.
The easiest way to get a low ACoS is to bid only on your own brand name and your best-converting keywords, and to keep bids low. ACoS drops. So does reach. New customers stop finding you, competitors take the searches you stopped paying for, and organic rank slips over the following months.
We see the reverse problem in audits too. A previous agency had heavily limited daily spend on an account we took over, which kept ACoS looking tidy while the brand lost visibility on the searches that mattered.
Use these checks before you celebrate a low ACoS:
- Is total revenue growing? If ACoS falls and revenue is flat or down, you’ve cut reach, not waste.
- What share of ad sales comes from your own brand name? Branded searches convert at very high rates. If they make up most of your ad sales, your ACoS flatters you.
- Is organic rank holding on your main keywords? If it’s slipping, low ad spend is costing you more than it saves.
- Is TACoS falling, or just ACoS? Only a falling TACoS shows the business is getting less dependent on ads.
5. What Good Looks Like at Each Stage
The right ACoS depends on what you’re asking the ads to do. A product in its first month and a product with three years of reviews need completely different numbers.
Expect during launch that ACoS will run 50 to 90% and TACoS 20 to 50%. The turning point is when TACoS drops below your margin.
| Stage | Typical timing | What ads are for | What to expect |
|---|---|---|---|
| Launch | First 30–90 days | Getting sales history and reviews so Amazon ranks the product | ACoS 50–90%, TACoS 20–50%. Losing money on ads is normal. |
| Growth | 6–24 months | Taking more searches and more rank | Around break-even, sometimes a short-term loss for long-term rank |
| Mature | 2 years and beyond | Defending rank and making profit | With a 30% margin, TACoS of 25% or lower |
| Clearing stock | When ending a product | Selling remaining units without waste | ACoS can go very low as spend narrows to what converts |
Launch. Only about one in five products are profitable from ads right away, and that’s fine as long as you planned for it. One plant-food brand we launched from scratch, with fewer than 20 reviews, settled at 50 to 60% ACoS and TACoS within about three months. As sales built, the brand raised its price from $19.99 to $24.99, which brought its ACoS down without cutting a single bid.
Growth. This is where most brands spend too little. Once a product converts, the job is to win more searches and climb the rankings. Running near break-even here is a deliberate trade: you pay for rank now so organic sales carry more of the volume later.
Mature. Now ads protect what you’ve built. With a 30% margin, we aim for TACoS of 25% or lower, which leaves room for profit after the cost of advertising.
Clearing stock. One account we managed was winding down a product line. Price cuts and tightly targeted exact-match campaigns took its ACoS from 51% to 5.5% while the remaining stock sold through.
6. How to Find Your Break-Even ACoS
Your break-even ACoS is the ACoS at which an ad-driven sale makes exactly zero profit. Above it, every ad sale loses money. Below it, every ad sale makes some.
Break-even ACoS = contribution margin ÷ price × 100
Contribution margin is what’s left of the price after the costs of making and delivering the sale, before any advertising:
Contribution margin = price – product cost – Amazon referral fee – FBA fee
Here’s a worked example for a product that sells for $30:
| Line | Amount |
|---|---|
| Price | $30.00 |
| Product cost, including shipping to Amazon | –$7.50 |
| Referral fee (15%) | –$4.50 |
| FBA fulfillment fee | –$5.50 |
| Contribution margin | $12.50 |
| Break-even ACoS | $12.50 ÷ $30.00 = 41.7% |
At a 41.7% ACoS, this product spends its whole margin on the ad. At 30%, it keeps $3.50 per ad-driven sale.
A few notes on getting the inputs right:
- Use your real fees. Referral fees vary by category, and FBA fees depend on size and weight. Your fee preview in Seller Central has the exact numbers per product.
- Include the costs that scale with each sale. Storage, returns and packaging belong in product cost if they’re significant for your product.
- Don’t know your product cost? As a starting point when cost data is missing, we assume a 25% break-even ACoS until real numbers come in. It’s cautious on purpose.
ACoS and Break-Even Calculator
Enter last month’s numbers from your ad console and Seller Central. Nothing you type leaves this page.
7. How to Set Your Target ACoS
Break-even is the ceiling, not the target. We set the target below it, based on what the product needs right now:
| Goal | Target ACoS | Example (break-even 41.7%) |
|---|---|---|
| Profit first | 50% of break-even | 20.8% |
| Balanced | 75% of break-even | 31.3% |
| Growth | 90% of break-even | 37.5% |
Profit first fits mature products where rank is stable and the job is to make money. Balanced fits most products most of the time. Growth fits products that convert well and have room to climb, where some margin is worth spending on rank.
Then check the target against TACoS. If your margin is 30% and your TACoS is 25%, the business keeps about 5 points of margin after ads. If TACoS is above your margin, the account is losing money overall, no matter how good any single campaign’s ACoS looks.
A Real Example: From $34K to $224K/Month
A mattress brand came to us at $34K/Month in sales. We expanded its keyword coverage and launched new products, which pushed ACoS up at first. Once the new campaigns were optimized, ACoS came back down while sales kept climbing. Fourteen months later, the brand was at $224K/Month, about 200 units a day, with ACoS at 19.9% and TACoS under 14%. Read the case study
The short-term ACoS rise was the price of the growth. Judging that brand on ACoS alone in month two would have stopped it.
Not sure what your ACoS should be? We’ll look at your account and show you where the margin is going. You decide what to do with it. Get my free audit
8. How to Lower ACoS Without Losing Sales
When ACoS is above target, the goal is to cut waste, not reach. These are the fixes we make first, roughly in order:
- Cut search terms that spend and never convert. In one audit, 183 targets were taking 75% of the ad spend at an average ACoS of 68%. Another account was wasting about $15K a month out of roughly $45K in total spend. After the cleanup, waste was down to $1,820 a month and ACoS fell from 53% to 38%.
- Move winning search terms into their own exact-match campaigns. Search terms that convert inside broad campaigns should get their own bids and budgets. One brand that isolated its best keywords this way cut TACoS from 27% to 14% in four months. Read the case study
- Fix the listing before raising bids. ACoS works out to cost per click ÷ (conversion rate × price). If conversion is low, no bid will fix it. An office supplies brand tripled its main image click-through rate and nearly doubled conversion, and TACoS fell from 50% to 12%. Read the case study
- Set bids from your margin. Max cost per click = price × target ACoS × conversion rate. For a $30 product with a 31% target and a 12% conversion rate, that’s $30 × 0.31 × 0.12 = $1.12.
- Look at price. A small price increase lowers ACoS on every sale, as long as conversion holds. The plant-food brand above is one example.
- Measure the whole account. A coffee brand deliberately ran at a loss for a few months to build Subscribe & Save customers. Over six months, TACoS fell from 31.7% to 15.9%. Read the case study
For a deeper look at the listing side, see our guide on how to improve product visibility on Amazon.
9. FAQ
A good ACoS is one below your break-even ACoS, which is your contribution margin divided by your price. As a market reference, the median among the 198 largest US accounts in Sophie Hub was 37.2% in September 2026, and the best quarter ran below 27.2%.
ACoS divides ad spend by ad sales. TACoS divides ad spend by total sales, including organic. ACoS shows how efficient the ads are. TACoS shows what ads cost the business.
For a mature product, below your margin with room for profit. With a 30% margin, we aim for 25% or lower. The median in our 2026 benchmark was 19.2%, and the best quarter was under 14%.
No. During a launch, ACoS of 50 to 90% is normal. During growth, running near break-even to win rank can be the right call. A high ACoS is only a problem when it isn’t buying anything, such as reviews, rank or new customers.
Subtract product cost, the referral fee and the FBA fee from your price to get contribution margin. Divide that by the price. A $30 product with $12.50 of contribution margin has a break-even ACoS of 41.7%.
They’re the same number turned upside down. ROAS is ad sales divided by ad spend. A 25% ACoS equals a ROAS of 4.
Usually because you’re reaching new shoppers on broader or more competitive searches, which convert at lower rates than your best keywords. Check TACoS. If TACoS is stable or falling, the extra spend is working.
Related Guides
- Amazon Seller Fees Explained: Every Fee and Your Real Margin
- Amazon PPC Bidding and Budget Strategy
- 12 Amazon PPC Mistakes We Find in Almost Every Account Audit
- Amazon PPC Targeting Guide: Keywords, Products and Audiences
Chris Rawlings is the founder of Sophie Society and an Amazon Ads Verified Partner. Sophie Society manages $5M/Month in Amazon ad spend and has worked with 800+ brands.
Data note: Sophie Hub figures cover the 198 largest US-marketplace accounts connected to Sophie Hub in September 2026, each spending $5K/Month or more on ads. These are accounts connected to the platform, not only accounts Sophie Society manages.
