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Blended Return on Ad Spend

Blended ROAS

Blended ROAS is total revenue divided by total ad spend across all paid channels. Instead of trusting the ROAS each ad platform reports for itself, it measures how much revenue the business made for every dollar spent on advertising overall.

Every ad platform reports its own ROAS, and each one takes credit for as many sales as its attribution rules allow. When the same order is claimed by Meta, Google and TikTok, adding up their numbers overstates what ads really produced. Blended ROAS sidesteps that by using two numbers the business can verify: revenue in the store and spend on the invoices.

How Do You Calculate Blended ROAS?

The formula is: blended ROAS = total revenue / total ad spend.

A store makes $90,000 in a month. It spends $12,000 on Meta, $6,000 on Google and $2,000 on TikTok, $20,000 in total. Blended ROAS is 4.5. Meanwhile the platforms might report ROAS of 5, 6 and 3, which would imply far more ad driven revenue than the store actually made.

Blended ROAS vs Platform ROAS

Platform ROAS is useful for steering campaigns inside one platform, comparing ads and audiences. Blended ROAS is the reality check for the whole account. When platform numbers rise but blended ROAS stays flat, the platforms are likely claiming more credit, not producing more sales.

Blended ROAS vs MER

The two are closely related and some teams use the names interchangeably. A useful distinction: blended ROAS divides revenue by ad spend only, while MER divides it by all marketing spend, including agency fees, tools, influencers and content. MER is the broader measure of marketing efficiency.

Limitations of Blended ROAS

  • It includes revenue that would have happened without ads, such as repeat and organic sales, so it can look healthy even when ads add little. Incrementality testing answers that question.
  • It does not show which channel is working, so it should sit alongside platform data, not replace it.
  • It ignores margins. Compare it with your break-even ROAS from contribution margin.

Frequently asked questions

What is blended ROAS?+

Blended ROAS is total revenue divided by total ad spend across all channels. It shows overall advertising efficiency without relying on each platform's attribution.

How is blended ROAS different from ROAS?+

Standard ROAS uses the revenue a platform attributes to its own ads. Blended ROAS uses total business revenue and total ad spend, so platforms cannot double count sales.

Is blended ROAS the same as MER?+

They are similar and often used interchangeably. Blended ROAS usually divides by ad spend only, while MER divides by total marketing spend.

Related terms

ROAS

Return on Ad Spend

ROAS (Return on Ad Spend) is a marketing metric that measures how much revenue a business earns for every dollar it spends on advertising. It is calculated by dividing the revenue attributed to your ads by the cost of those ads.

MER

Marketing Efficiency Ratio

MER (Marketing Efficiency Ratio) is a metric that measures total company revenue against total marketing spend across all channels. Unlike channel-level ROAS, it takes a blended, business-wide view of whether marketing as a whole is producing revenue efficiently.

Attribution

Marketing Attribution

Marketing attribution is the process of assigning credit for a conversion to the marketing touchpoints that contributed to it. It answers which channels, campaigns, or interactions should be credited when a customer completes a purchase or a lead.