Amazon PPC and SEO strategist. 40+ brands managed, $50M+ in managed revenue.
Amazon ACOS (advertising cost of sales) is your ad spend divided by the sales those ads produced, times 100. Spend $150 and get $600 in ad sales and your ACOS is 25%, meaning 25 cents of every ad dollar earned went back into ads.
Cross-category averages in 2026 sit around 29 to 34%, but the only number that decides whether a campaign is profitable is your break-even ACOS, which equals your profit margin before ads.
Key takeaways
- ACOS = ad spend ÷ ad-attributed sales × 100.
- Only three inputs move it: CPC, conversion rate, and selling price.
- Break-even ACOS equals your profit margin before ads.
- ROAS is ACOS flipped. TACOS adds organic revenue to the picture.
- ACOS never sees organic sales, and it never sees returns.
What Is Amazon ACOS
Amazon ACOS stands for advertising cost of sales. It tells you how much you spent on ads for every dollar those ads earned. Amazon uses it to measure how cost-efficient your Sponsored Products, Sponsored Brands, and Sponsored Display campaigns are.
If your ACOS is 25%, you spent $0.25 on advertising for every $1.00 in ad revenue.
The sales in your ACOS come from shoppers who clicked your ad and bought inside Amazon’s attribution window. A shopper who scrolls past your ad and buys organically does not count. Returns do not come back out of it either.
What ACOS counts and what it ignores
| Counted in ACOS | Not counted in ACOS |
|---|---|
| Ad clicks and attributed sales | Organic sales your ads helped rank |
| Sales inside the attribution window | Returns after the order posts |
| Shopper checkout price | Amazon fees, COGS, freight, and storage |
That is why ACOS is an efficiency metric, not a profit metric. A 20% ACOS on a product with an 18% margin still loses money.
How to Calculate Amazon ACOS
The formula:
If you spend $150 and generate $600 in attributed ad sales:
The three levers that actually move ACOS
Ad spend is clicks × CPC. Ad sales are clicks × conversion rate × selling price. Clicks cancel out:
At a $1.20 CPC, 10% conversion rate, and $24.99 selling price, ACOS is 48%. Raise conversion to 14% without changing the bid and ACOS falls to 34%. That is why listing work is often better than cutting bids.
Where to Find Your ACOS
Find ACOS inside Campaign Manager under Advertising in Seller Central. It appears beside spend, sales, and orders at campaign, ad group, keyword, and product-target level. For customer search terms, download the Sponsored Products search term report.
Amazon can take up to 48 hours to post attributed sales, and Sponsored Products uses a 7-day attribution window. Make bid decisions on 7 to 30 days of data, not on a single day.
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ACOS vs ROAS vs TACOS
ACOS and ROAS are the same number viewed from opposite ends. TACOS answers a different question: how dependent is the product on advertising?
| Metric | Formula | What it answers |
|---|---|---|
| ACOS | Ad spend ÷ ad sales × 100 | How efficient is this campaign? |
| ROAS | Ad sales ÷ ad spend | What comes back per ad dollar? |
| TACOS | Total ad spend ÷ total revenue × 100 | How dependent is the product on ads? |
ROAS = 100 ÷ ACOS%. A 25% ACOS is a 4x ROAS. TACOS uses total revenue, ads plus organic, so it catches the sales ACOS cannot see. Mature products often settle around 5 to 10% TACOS, while launches can run 15 to 25% before trending down.
What Is a Good Amazon ACOS
There is no universal good ACOS. Published 2026 Sponsored Products datasets put the cross-category average between 29 and 34%, but category and margin matter more than the platform average.
| Category | Typical ACOS | Typical CVR |
|---|---|---|
| Books | 19 to 26% | 12 to 15% |
| Food and Grocery | 21 to 23% | 12 to 14% |
| Beauty | 24 to 31% | 9 to 12% |
| Home and Kitchen | 27 to 32% | 9 to 12% |
| Electronics | 30 to 34% | 7 to 9% |
| Clothing and Apparel | 42% and up | 6 to 9% |
A 28% ACOS can be excellent for a high-margin supplement and loss-making for electronics. Benchmarks provide context. Break-even ACOS decides profitability.
Find Your Break-Even ACOS Before You Set Any Target
Break-even ACOS is your profit margin before ads, expressed as a percentage of selling price. Below it, an ad order makes money. Above it, the order loses money.
| Line item | Per unit |
|---|---|
| Selling price | $24.99 |
| Referral fee at 15% | $3.75 |
| FBA fulfillment fee | $4.75 |
| Inbound freight | $0.35 |
| Landed cost | $6.80 |
| Storage allowance | $0.20 |
| Profit before ads | $9.14 |
At 25% ACOS, ads cost about $6.25 per order and you keep roughly $2.89. At 50%, you lose $3.36 per ad order.
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ACOS Targets by Campaign Stage
| Stage | Campaign job | Working target |
|---|---|---|
| Launch, weeks 1 to 4 | Sales velocity, reviews, and rank | 60 to 100%+ |
| Growth, months 2 to 4 | Harvest terms and cut waste | 40 to 60%, trending down |
| Mature | Hold rank profitably | Break-even minus a buffer |
During launch, high ACOS can be intentional. Budget it like inventory, set a time limit, then taper down as conversion rate and organic rank improve.
Why Your ACOS Suddenly Jumped
Compare the last 14 days with the previous 14 and isolate CPC, clicks, conversion rate, and spend.
| What changed | Likely cause | Check first |
|---|---|---|
| CPC up, CVR flat | Auction pressure or placement change | Placement report and bidding strategy |
| CVR down, CPC flat | Listing, price, Buy Box, or reviews | Offer and listing history |
| Impressions up, orders flat | Broad or auto expansion | Search term report |
| Spend spiked overnight | Rule or budget change | Campaign change history |
| Impressions collapsed | Out of stock, Buy Box loss, suppression | Inventory and listing health |
Why Your ACOS Can Mislead You
Branded campaigns inflate blended ACOS
Brand terms often show 3 to 8% ACOS because shoppers already know you. Separate branded and non-branded campaigns.
ACOS never sees organic sales
A keyword at 55% ACOS can still lift organic rank. Judge it alongside TACOS, total revenue, and rank before pausing it.
Returns never come back out of it
In high-return categories, reported ACOS overstates real profitability. Track a returns-adjusted number monthly.
Low ACOS can mean you stopped competing
An account that falls from 32% to 18% ACOS while revenue falls 40% did not become efficient. It stopped buying traffic.
How to Lower Your Amazon ACOS
1. Add negative keywords
Sort the 30-day search term report by spend. Add terms that spend beyond a sensible portion of your product margin as negative exact targets.
2. Harvest converting search terms
Move terms with several orders at or below break-even ACOS into exact match campaigns, while leaving auto campaigns enough budget to explore.
3. Lower bids gradually
Cut bids 10 to 15% per adjustment, then wait 4 to 7 days or at least 10 more clicks. A 0% ACOS from zero impressions is not a win.
4. Adjust placements
Compare top-of-search, rest-of-search, and product-page performance. Reduce multipliers where spend is high and conversion is weak.
5. Fix the listing
Compare your main image, price, reviews, and offer against page-one competitors. A weak listing at any bid is expensive traffic.
A 30-day sequence
| Week | Action | Expected result |
|---|---|---|
| 1 | Negatives and obvious waste | Spend drops, sales stay stable |
| 2 | Placement and bidding fixes | CPC settles |
| 3 | Harvest converters and split brand | Cleaner reporting |
| 4 | Main image, price, A+ content | Conversion improves |
Frequently Asked Questions
What does ACOS stand for?
ACOS stands for advertising cost of sales. It is ad spend divided by attributed ad sales, multiplied by 100.
What is a good ACOS on Amazon?
For many mature campaigns, 15 to 30% is healthy. Your break-even ACOS matters more than any universal benchmark.
Is a lower ACOS always better?
No. A low number from branded traffic or almost no spend does not necessarily grow the product.
What is the difference between ACOS and ROAS?
ACOS is spend divided by sales. ROAS is sales divided by spend. A 25% ACOS equals a 4x ROAS.
What is the difference between ACOS and TACOS?
ACOS measures spend against ad sales. TACOS measures spend against total revenue, including organic sales.
How often should you check ACOS?
Check weekly for bid and budget changes and monthly for target reviews. Daily decisions are usually made on unfinished attribution data.
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About the author
Tanveer Abbas is an Amazon PPC and SEO strategist who has managed advertising for 40+ brands and more than $50M in tracked revenue.