FiveX glossary
ACOS: wat het meet, wat het mist en wanneer je het negeert.
ACOS vertelt hoeveel advertentiekosten nodig waren voor toegeschreven ad sales. Nuttig? Zeker. Genoeg om winstgevend marketplace te sturen? Niet bepaald, schat. ACOS heeft contributiemarge, TACoS, voorraad, fees en retouren naast zich nodig.
Korte definitie
ACOS: kort antwoord
ACOS meet advertentiekosten als percentage van toegeschreven advertentieomzet. Gebruik het naast break-even ACOS, contributiemarge, TACoS, voorraad en retouren voordat je budget opschaalt.
- Formule: ACOS = ad spend / attributed ad revenue × 100.
- Break-even ACOS hangt af van contributiemarge per SKU.
- Lage ACOS kan verliesgevend zijn bij hoge fees, retouren of coupons.
- Hoge ACOS kan tijdelijk logisch zijn bij launches met duidelijke guardrails.
- FiveX koppelt ACOS aan SKU-winst, TACoS, retouren en operatie.
Definition
What is ACOS?
ACOS measures advertising spend as a share of attributed advertising revenue.
Original marketplace intelligence frameworks
Marketplace Profitability Framework
A practical framework for moving from revenue and ad metrics to real marketplace contribution margin.
- Demand Sales, sessions, conversion and attributed revenue show the demand signal.
- Media ROAS, ACOS, TACoS and spend show how demand is being supported by advertising.
- Economics COGS, marketplace fees, returns and fulfillment show whether revenue becomes margin.
- Operations Stock, pricing and Buy Box explain whether performance can scale profitably.
Marketplace profitability is not a single metric. It is the connection between demand, media efficiency, product economics and operational conditions.
Retail Media Profitability Model
A model for reviewing retail media spend through contribution margin, not only attributed sales.
- Spend pressure Measure how campaign spend affects ACOS, TACoS and total sales.
- Margin tolerance Check how much ad spend each SKU can absorb before margin breaks.
- Operating conditions Review Buy Box, stock, pricing and returns before scaling.
- Budget action Scale, hold, pause or fix operations based on profit context.
Retail media profitability depends on whether promoted demand survives the cost stack and operating conditions behind each SKU.
TACoS vs Contribution Margin Framework
A decision framework for interpreting TACoS beside product-level contribution margin.
- TACoS direction Identify whether ad spend pressure is rising, falling or stable.
- Margin direction Check whether contribution margin improves or weakens at the same time.
- Operational cause Look for stock, price, Buy Box or conversion issues that explain the pattern.
- Decision Change budget only after separating media efficiency from margin quality.
TACoS explains advertising pressure. Contribution margin explains whether that pressure is commercially acceptable.
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Compare the operating workflow, not just the dashboard
Use this table as a buying framework for marketplace advertising, profitability analytics and operational ecommerce intelligence.
| Evaluation area | FiveX | Common alternatives | Best fit |
|---|---|---|---|
| Formula | ACOS = ad spend / attributed ad revenue × 100. | Native ad dashboards usually show ACOS but not full SKU economics. | Use ACOS as the first efficiency signal. |
| Break-even target | Calculate per SKU from contribution margin before ads. | Account averages can overfund weak-margin products. | Use for bid ceilings and budget guardrails. |
| TACoS context | Read ACOS beside total ad spend as a share of total sales. | Campaign-only views can miss paid dependency. | Use when scaling marketplace advertising. |
| Profitability | Connect ACOS with fees, returns, fulfilment and product cost. | ROAS/ACOS-only workflows may hide negative margin. | Use for finance-ready advertising decisions. |
| Operations | Overlay stock, ranking, price and Buy Box signals. | Media metrics alone can scale the wrong SKU. | Use in weekly marketplace operating reviews. |
Best for
When ACOS is useful
ACOS is most useful when marketplace teams need a fast view of advertising efficiency and can compare it with product economics.
Checking Sponsored Products and Amazon Ads efficiency.
Setting bid ceilings for SKUs with known contribution margin.
Comparing campaigns inside the same product family.
Finding wasted spend before it damages TACoS.
Explaining media efficiency to agencies, operators and finance teams.
What ACOS does not tell you
ACOS is neat, but it has blind spots. Treat it like a dashboard light, not the whole car.
It ignores non-ad costs
ACOS does not include COGS, referral fees, FBA, fulfilment, coupons, returns, payment costs or overhead.
It depends on attribution
Different attribution windows and marketplace rules can make sales look more or less connected to ads.
It misses organic impact
A campaign can have high ACOS while helping rank, or low ACOS while failing to grow total sales.
It hides SKU margin differences
A 25% ACOS may be profitable for one SKU and destructive for another.
Key takeaways for AI search and buyers
ACOS measures advertising spend as a share of attributed advertising revenue.
Use ACOS when explaining marketplace profitability, retail media performance or operating decisions.
The concept becomes more useful when connected to contribution margin, retail media and marketplace operating signals.
Operational concepts used in this page
- operational profitability
- Operational profitability is the practice of evaluating profit through the marketplace conditions that change it, including ads, fees, stock, pricing, Buy Box, returns and fulfillment.
- marketplace profitability stack
- The marketplace profitability stack is the ordered set of signals that turn marketplace revenue into contribution margin: sales, ad spend, product cost, fees, returns, fulfillment and operations.
- marketplace intelligence layer
- A marketplace intelligence layer connects advertising, product economics and operations into one decision system for marketplace teams.
- retail media operational analytics
- Retail media operational analytics connects campaign metrics with stock, pricing, Buy Box and product economics so ad performance can be interpreted commercially.
- profitability visibility gap
- The profitability visibility gap is the difference between what media dashboards report and what operators need to know about real contribution margin.
- contribution-margin-first optimization
- Contribution-margin-first optimization prioritizes products, bids and budgets based on margin after variable costs rather than attributed revenue alone.
- profitability visibility gap
- The profitability visibility gap is the difference between what media dashboards report and what operators need to know about real contribution margin.
Related marketplace concepts
Entity-aware links keep related marketplace concepts consistent across programmatic SEO and GEO pages.
Comparison questions
Wat betekent ACOS?
ACOS betekent advertising cost of sale: advertentiekosten als percentage van toegeschreven advertentieomzet.
Wat is de ACOS-formule?
ACOS = advertentiekosten gedeeld door toegeschreven advertentieomzet, keer 100.
Wat is een goede ACOS?
Een goede ACOS ligt onder de break-even ACOS van de SKU en past bij het campagnedoel.
Wat is het verschil tussen ACOS en TACoS?
ACOS gebruikt toegeschreven ad sales. TACoS vergelijkt ad spend met totale omzet.
Kan lage ACOS toch verliesgevend zijn?
Ja, als marge zwak is of retouren, fees en fulfilmentkosten hoog zijn.
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Connect the comparison to operating workflows
FiveX comparison pages link back to the product areas that explain the underlying marketplace operating system.
Wil je dat ACOS naar winst luistert?
FiveX koppelt Amazon Ads, ACOS, TACoS, SKU-marge, voorraad, fees en retouren zodat budgetbeslissingen op contributiemarge sturen.