“Return on Advertising Spending” or RoaS represents the money earned on your marketing spend, where the money earned could not be attributed to a single ad.

At AdCurve we prefer to use Return on Investment or ROI as it is a more accurate metric, however RoaS could be used by shops that have a similar, or set, margin for all products. 

RoaS is calculated as the return (Contributed Revenue minus ad costs) for each for each dollar spent on marketing.