Blended ROAS calculator

Blended ROAS is total revenue divided by total marketing spend across every channel. It differs from platform-reported ROAS in one decisive way: revenue is counted once, at the point it actually arrived, rather than claimed separately by each platform that touched the customer. It is the only return figure that cannot be double counted.

Because each one counts a sale it believes it influenced, under its own attribution rules and window. Meta counts view-through conversions Google Analytics never sees. Google Ads dates conversions to the click rather than the purchase. Klaviyo claims a sale if there was an email click in its window. The same order can legitimately appear in three platforms at once, so the total exceeds reality.

Not by itself. Some overlap is expected and normal, because customers genuinely do see several ads before buying. What matters is the size and the stability of the gap. A gap that holds steady month to month is measurement working as designed. A gap that suddenly moves is worth investigating, and usually means a tracking change rather than a performance change.

Blended. It cannot be inflated by a vendor with an interest in the result, it cannot be double counted, and it is the figure your finance team already recognises. Keep platform-reported ROAS for deciding which ad to turn off, where the comparison is like-for-like inside one platform. Do not use it to decide whether marketing worked.

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