Return on Ad Spend (ROAS)
Return on ad spend measures the revenue attributed to advertising divided by the amount spent on that advertising.
What is Return on Ad Spend?
ROAS is an advertising revenue-efficiency metric. It answers how much attributed revenue a campaign reports per dollar of media spend. It does not directly measure profit, newly acquired customers or incremental sales caused by the ads.
The word “attributed” matters. An advertising platform assigns credit according to a model and time window. Two platforms may claim the same purchase, while an order placed outside a window may receive no credit at all.
ROAS = Attributed revenue ÷ Ad spend
A result of 4 means 4× or 400% ROAS. Use the same campaign scope, currency and reporting window; identify whether attributed revenue is adjusted for discounts and refunds.
Four dollars of revenue is not four dollars of profit
A campaign spends $2,000 and reports $8,000 of attributed revenue. ROAS is 4×. If that revenue carries a 30% contribution margin before advertising, it produces $2,400 of pre-ad contribution. Subtracting the $2,000 spend leaves $400 before fixed costs, assuming the revenue and cost figures describe the same sales.
How to interpret it
ROAS is useful for reading advertising performance when the measurement rules stay consistent. A movement may reflect campaign efficiency, a change in average order value, attribution settings or the treatment of returning customers. It does not isolate those causes by itself.
Profitability depends on what the attributed sales retain before advertising. Under a simple matched-revenue model, break-even ROAS before fixed costs is one divided by the pre-ad contribution rate. At 30%, that is about 3.33×. This is a model threshold, not a universal campaign target.
A high ROAS can also come from reaching people who were already likely to buy. Attribution assigns credit; incrementality asks what would have happened without the ad. Those questions require different evidence.
ROAS is narrower than return on investment. It uses revenue rather than profit in the numerator and media spend rather than necessarily all marketing costs in the denominator. Agency fees, creative production and other acquisition expenses can make fully loaded economics less attractive.
Common mistakes
Reading 400% ROAS as a 400% profit return
The numerator is attributed revenue. Product costs, fulfillment and other expenses still have to be paid.
Adding platform-attributed revenue without deduplication
If two platforms claim one order, summing their reports overstates the store’s revenue. Reconcile attribution views with actual orders.