What Is Blended ROAS and Why It Matters More Than Platform ROAS

Platform ROAS is what Meta tells you. Blended ROAS is what is actually happening to your business. The gap between the two is where most eCommerce brands quietly lose money.

If you are making budget decisions based on the ROAS number inside Meta Ads Manager, you are working with incomplete information. This is not a niche accounting concern — it is one of the most consequential measurement errors in eCommerce growth. What Platform ROAS Actually Measures Meta's reported ROAS measures the revenue Meta believes was influenced by its ads, divided by your ad spend within Meta. The problems: Meta uses a click and view attribution window that will double-count purchases that also appear in your Shopify reports. It includes revenue from people who would have bought anyway