ROAS (Return on Ad Spend) = Revenue from Ads รท Cost of Ads. A 4:1 ROAS means you earn $4 for every $1 spent on advertising. For ecommerce, the minimum healthy ROAS is 3:1, but most profitable stores target 4:1 to 6:1. A 5:1 ROAS with 60% profit margin translates to 200% return on ad investment. Platform benchmarks: Facebook/Instagram typically needs 4โ6:1, Google Search 5โ8:1, Amazon PPC 3โ5:1.