Blended ACoS & Blended ROAS
Last updated: April 8, 2026
Definition: What are blended ACoS and blended ROAS?
Blended ACoS and blended ROAS are cross-channel efficiency metrics. They put a company's total advertising spend in relation to its total revenue – across all channels and ad formats, not just within a single platform like Amazon. So what is blended ROAS? In short, it answers how much total revenue you earn for every advertising dollar you invest, no matter where that spend goes.
While the standard ACoS only accounts for the revenue directly attributed to Amazon ads, blended ACoS also combines external advertising channels such as Google Ads, Meta, TikTok, or DSP campaigns with the total revenue they help generate. Blended ROAS is its reciprocal and answers the question: “How much revenue do I get in total for every advertising dollar invested?”
Table of contents
How they differ from standard ACoS and TACoS
The three metrics ACoS, TACoS, and blended ACoS each measure advertising efficiency from a different perspective – and they should not be confused with one another.
- ACoS: Advertising costs divided by directly attributed ad revenue within a single platform.
- TACoS: Advertising costs divided by total revenue on a single platform (advertising + organic).
- Blended ACoS: Total advertising spend (all channels) divided by total revenue (all sources).
Blended ACoS is therefore the most strategic of the three metrics, because it takes the perspective of a managing director or CMO: instead of evaluating a single campaign, it assesses the entire marketing spend structure.
The formulas for calculation
Both metrics can be calculated with a simple division. The only thing that matters is that the numerator includes all advertising spend and the denominator includes all revenue.
Blended ACoS = (Total advertising spend / Total revenue) × 100
Blended ROAS = Total revenue / Total advertising spend
Mathematically, the two values are reciprocals of each other. A blended ACoS of 20% corresponds to a blended ROAS of 5. Which metric is preferred depends on the reporting standard within the company – in performance marketing, ROAS is usually more common, while in the Amazon world, ACoS prevails.
A calculation example
Starting situation
- • Amazon Sponsored Ads: €8,000 spend / €40,000 attributed revenue
- • Amazon DSP: €3,000 spend / €9,000 attributed revenue
- • Google Ads: €2,000 spend / €12,000 attributed revenue
- • Meta Ads: €1,000 spend / €4,000 attributed revenue
- • Organic Amazon revenue: €25,000
Calculation
Total advertising spend: 8,000 + 3,000 + 2,000 + 1,000 = €14,000
Total revenue (ad-driven + organic): 40,000 + 9,000 + 12,000 + 4,000 + 25,000 = €90,000
Blended ACoS = (14,000 / 90,000) × 100 = 15.6%
Blended ROAS = 90,000 / 14,000 = 6.4
This means: for every advertising dollar invested, the company generates €6.40 in total revenue – across all channels.
Why these metrics matter
Blended ACoS closes a gap that the standard platform-specific ACoS leaves behind: it reveals how efficiently the entire advertising budget is working. This is especially relevant for brands that advertise on multiple channels in parallel or that drive external traffic to Amazon listings.
In practice, blended ACoS serves as a benchmark for strategic budget decisions. A rising Amazon ACoS combined with a falling blended ACoS can, for example, mean that external channels like Google Ads are generating additional revenue on Amazon – a classic halo effect that stays invisible in standard ACoS reporting.
Frequently asked questions (FAQ)
What is the difference between blended ACoS and TACoS?
TACoS refers to a single platform (usually Amazon) and relates only the Amazon advertising costs to the total Amazon revenue. Blended ACoS, on the other hand, covers all channels – Amazon, Google, Meta, TikTok, and more – as well as every revenue source. It is therefore broader in scope than TACoS.
What is a good blended ACoS value?
There is no universally good value. The target depends heavily on margin, strategy, and growth phase. Many established brands operate with a blended ACoS between 10% and 20%, while brands in a growth phase may run significantly higher to capture market share.
How do I measure blended ACoS in practice?
The calculation itself is simple; consolidating the data is the real challenge. You need the advertising spend from all channels as well as the total revenue from all sources – ideally in a central BI tool or dashboard that merges the data automatically.
Related terms
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