Return on Ad Spend
The revenue generated for every dollar spent on advertising, calculated as revenue divided by ad spend.
What Return on Ad Spend means
Return on ad spend (ROAS) measures advertising efficiency by calculating the ratio of revenue generated to advertising cost. A ROAS of 4:1 means every $1 spent on ads generates $4 in revenue. ROAS is a primary performance metric for e-commerce and direct-response campaigns, and platforms offer ROAS-based bidding strategies (Meta's Minimum ROAS, Google's Target ROAS). From a compliance perspective, ROAS optimization can sometimes incentivize aggressive advertising tactics — misleading claims and clickbait may boost short-term ROAS but create long-term risks through chargebacks, refunds, and account penalties. Additionally, ROAS measurement accuracy depends on proper conversion tracking, which requires compliant pixel/CAPI implementation and attribution models. Privacy-driven signal loss (from ATT, cookie restrictions) has made ROAS measurement less reliable, pushing advertisers toward modeled conversion and incrementality testing approaches.
Related terms
Conversion
A desired action completed by a user after interacting with an ad, such as a purchase, sign-up, or download.
Cost Per Acquisition
The average cost to acquire one conversion, calculated by dividing total ad spend by the number of conversions.
Attribution
The process of determining which ads and touchpoints contributed to a conversion, used for optimizing ad spend allocation.
Pixel
A piece of code installed on a website that tracks user actions and sends data back to an ad platform for measurement and optimization.