Should I focus on ROAS or ACOS for portfolio reporting?
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Quick answer
ROAS and ACOS are complementary Amazon Ads portfolio metrics that answer different questions about advertising performance. ROAS measures revenue generated for each dollar of ad spend, while ACOS measures ad spend as a percentage of sales. For portfolio reporting, neither should be used in isolation: ROAS highlights growth and return potential, while ACOS shows cost pressure and profitability risk. Tracking both together gives a clearer view of whether increased spending is producing efficient growth or simply raising costs.
If you are reviewing multiple campaigns together, the choice is not really ROAS or ACOS. The more practical question is how each metric should shape your decisions. A portfolio can show strong ROAS while ACOS rises on certain products, so holding both metrics side by side often prevents misleading conclusions.
What ROAS and ACOS reveal in a portfolio
At portfolio level, ROAS is useful for spotting which campaign groups are generating meaningful revenue relative to spend. ACOS is more directly tied to profitability because it shows how much of each sale is consumed by advertising costs.
- ROAS — higher numbers generally indicate stronger revenue response per dollar of ad spend.
- ACOS — lower numbers indicate less ad cost per sale, but very low ACOS may also reflect limited campaign exposure rather than healthy profitability.
A practical way to use both together
Compare the two side by side rather than choosing a single KPI. For example, if ROAS is stable but ACOS is creeping up, cost efficiency may be eroding before revenue growth becomes obvious. If ACOS is low but ROAS is weak, ad spend may be efficient without generating enough volume or return.
Portfolio reporting tools can help here. Amazon Ads Dashboard by Todoza aggregates spend, sales, ROAS, wasted spend, and conversion data in one place, making it easier to compare these signals across accounts.
When this matters most
This distinction is especially useful when you are deciding whether to scale a campaign, pause low performers, or explain results to a stakeholder. ROAS can justify growth, while ACOS can flag when that growth is becoming expensive. If you report only one, you may miss the reason behind the other.
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Related guides
ROAS and ACOS are best treated as two connected inputs in Amazon Ads portfolio reporting, not competing choices. Once both are visible, the next step is deciding which other KPIs deserve attention across your campaign groups. For a broader view of portfolio-level performance indicators, see Amazon Ads Portfolio Reporting: Which KPIs Matter?