ROAS (Return on Ad Spend) is the ratio of revenue generated by an ad campaign to the spend on that campaign — typically expressed as a multiple (e.g., 4x ROAS = $4 of revenue per $1 of spend).
ROAS is the headline metric for direct-response paid advertising. It's calculated as total ad-attributed revenue divided by total ad spend, expressed as a ratio. A campaign that drove $40,000 in revenue against $10,000 in spend has 4x ROAS. ROAS targets vary widely by margin profile — D2C brands at 30% contribution margin need 3.3x ROAS to break even, while high-margin SaaS can be profitable at 1.5x.
Single-platform ROAS is what each ad network reports natively (Meta's ROAS, Google's ROAS, etc.) using its own attribution model. These numbers are right from each platform's perspective but inflated as a portfolio view — Meta and Google both count a conversion they each contributed to. The honest portfolio metric is blended ROAS: total revenue from all sources divided by total ad spend across all platforms.
Three time windows matter for ROAS reporting. 7-day for tactical decisions (is this creative working?), 14-day for trend confirmation (is the regression real?), 30-day for strategic review (is the blended number trending up or down month-over-month?). Anything shorter is statistical noise on most accounts.
ROAS has known limitations as a sole metric. It doesn't capture contribution margin (a high-revenue, low-margin SKU at 4x ROAS may be less profitable than a moderate-revenue, high-margin SKU at 3x). It doesn't account for incrementality (whether the ad caused the purchase or just got credit for it). For most decisions, blended ROAS plus contribution margin plus a periodic incrementality test is the working stack.
Gapscout's cross-platform reporting computes blended ROAS automatically by aggregating spend and conversion data from every connected network via Marketing APIs. Snapshot history lets you compare blended ROAS across rolling 7/14/30-day windows; the AI audit agents flag campaigns whose ROAS regresses against their own baseline.
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