What is blended ROAS?
Blended ROAS is total revenue divided by total ad spend across all channels combined. It is the overall top-level ceiling of advertising efficiency.
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Definition
Blended ROAS is total revenue divided by total ad spend across all channels combined — a single, top-level view of advertising efficiency. Unlike platform-reported or per-channel ROAS, it needs no attribution: it just compares all revenue to all spend. That makes it simple and hard to game, but it also can't tell you which channels produced the return.
How to calculate blended ROAS.
Blended ROAS =
Total Revenue ÷ Total Ad Spend (All Channels)
Be explicit about what "total revenue" means — new revenue in the period, all revenue, or attributed revenue — and keep it consistent. The defining feature is that blended ROAS is top-down: it doesn't assign credit to any channel, so no attribution model can inflate or distort it. That's its strength and its weakness — it's honest, but directionless.
Blended ROAS example.
Now compare: if Meta, Google and your other platforms each claim their own ROAS and you sum them, the total often implies far more revenue than the $50,000 you actually earned — because each platform counts the same conversions. Blended ROAS is the reality check that number can't exceed.
Why blended ROAS matters for attribution.
Blended ROAS and attributed ROAS do different jobs, and you need both. Blended is the honest ceiling — because ad platforms over-claim (their summed ROAS routinely exceeds real results), blended ROAS keeps everyone grounded in what actually happened. But it's directionless: you can't decide where to spend from a single blended number.
Attributed, per-channel ROAS is how you allocate — and the test of good attribution is that your channel ROAS reconciles back to blended. Signal Sparrow ties attribution to real Stripe revenue and reconciles it, so attributed and direct/unknown revenue sum to your actual total — no channel ROAS that quietly adds up to more revenue than you earned. Blended tells you the truth; reconciled attribution tells you where it came from. (Pipeline health →)
Questions, answered.
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Blended ROAS is total revenue divided by total ad spend across all channels combined. It gives a single, top-level view of ad efficiency without relying on attribution to any specific channel.
Divide total revenue by total ad spend across all channels. For example, $50,000 in revenue on $12,500 of total spend is a blended ROAS of 4x.
Platform ROAS is each ad platform's own claim, counted with its own attribution window — so summing them over-states results. Blended ROAS compares all real revenue to all spend, which the platforms' claims can't exceed.
It's a reality check. Because platforms over-claim conversions, blended ROAS grounds you in actual results and acts as a ceiling your attributed, per-channel numbers should reconcile to.
Both. Use blended ROAS to sanity-check overall efficiency, and per-channel attributed ROAS to decide where to allocate budget. Good attribution reconciles back to the blended total.
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