Amazon glossary
What is RoAS?
RoAS — Return on Ad Spend.
By AIAdKing Editorial Team · Reviewed
- RoAS — Return on Ad Spend
- RoAS (Return on Ad Spend) = ad revenue ÷ ad spend. It is the inverse of ACoS: a 4× RoAS is the same as a 25% ACoS. RoAS expresses ad efficiency as a multiple (“$4 back for every $1 spent”) rather than a percentage.
In depth
RoAS and ACoS describe the same thing from opposite directions. RoAS = 1 ÷ ACoS. Many sellers and most non-Amazon ad platforms use RoAS; Amazon’s console defaults to ACoS. A higher RoAS is better (more revenue per ad dollar); a lower ACoS is better. Convert with: RoAS = 100 ÷ ACoS% — or flip between the two in seconds with the ACoS calculator. Whichever framing you use, the profitable floor comes from margin, not from the metric: the break-even calculator turns your real costs into the RoAS a campaign must clear.
Formula
RoAS = Ad-Attributed Revenue ÷ Ad Spend | RoAS = 100 ÷ ACoS %
Worked example
A Sponsored Brands campaign spends $167 and drives $667 in ad-attributed revenue. RoAS = $667 ÷ $167 ≈ 4× (or $4 returned per $1 spent). Convert to ACoS: 100 ÷ 4 = 25%. If your product's break-even margin is 33%, the break-even RoAS is 100 ÷ 33 = 3.03×. So this 4× campaign clears break-even with room; a 2.8× campaign on the same product would burn money even though 2.8× "sounds positive." RoAS makes cross-channel comparison easier (Google Ads, Meta); ACoS is native to Amazon reports.
When to use it
Use RoAS when reporting to stakeholders who compare Amazon against Google, Meta, or agency KPIs — most external ad platforms speak RoAS. Also use it when the framing of "$X back per $1 in" is more actionable for your team than a percentage.
Common mistakes
- Treating a RoAS above 1× as automatically profitable — 1× only recovers revenue, not gross margin; break-even RoAS is 1 ÷ contribution margin, so a 30%-margin product needs 3.3× just to break even.
- Mixing RoAS across Amazon, Google, and Meta into a blended number — each platform attributes differently (Amazon 7-day post-click, Meta 7-day click + 1-day view), so blended RoAS is apples-to-oranges.
- Reporting Sponsored Brands RoAS without noting Amazon's "new-to-brand" split — a 5× headline can hide a 2× new-customer RoAS worth defending vs. an 8× loyal-customer RoAS worth trimming.
How AIAdKing handles RoAS
AIAdKing optimises to whichever target you set — ACoS, RoAS or profit — and logs a clear reason for every bid change so you always know why efficiency moved.
RoAS — quick answers
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