Marketing ROI
The return produced by marketing investment, expressed against the revenue it can be credibly connected to.
It inherits attribution's assumptions
Marketing ROI is attribution plus arithmetic. Every limitation of the attribution model — the invisible channels, the credit rule, the lookback window — is carried into the ROI figure, usually without being restated.
State the model with the number
How to get closer to a real answer
State the attribution model before the number. Marketing ROI is revenue attributed divided by spend, and the model decides the numerator entirely.
Use gross profit rather than revenue in the numerator, or the figure ignores the cost of delivering what was sold.
Match the time window to the sales cycle. Spend in one quarter produces revenue in a later one, and same-period ROI systematically misreads both.
Where you can, test incrementality rather than attribution: hold a channel or a geography out and measure the difference.
Report the confidence honestly. A holdout test gives evidence; a last-touch model gives an accounting convention.
Where it misleads
Attribution is not causation. Revenue attributed to a channel would in many cases have arrived without it, and no model can separate the two.
Brand, community and word of mouth are largely unattributable, so the channels that are measurable absorb credit that belongs elsewhere.
Optimising to reported ROI drives spend towards measurable, late-funnel channels that harvest demand rather than create it.
A high ROI on a small budget frequently means underinvestment rather than efficiency.
RELATED TERMS
Attribution
The methodology connecting marketing touchpoints to revenue outcomes, so investment can be allocated on evidence rather than on preference.
Attribution Model
The specific rule assigning credit for a conversion across the touchpoints that preceded it.
Cost Per Acquisition (CPA)
The cost of acquiring one customer through a specific channel or campaign — a narrower, channel-level cousin of CAC.
Cost Per Lead (CPL)
Marketing spend divided by leads generated. The most immediately available demand-gen metric and the easiest to misread.
Customer Acquisition Cost (CAC)
The fully loaded cost of acquiring one new customer: sales and marketing spend for a period divided by new customers acquired from it.
Marketing Sourced Pipeline
Pipeline where marketing originated the first meaningful contact with the account, according to a documented rule.
COMMON QUESTIONS
- What is marketing ROI?
- The return produced by marketing investment, expressed against the revenue marketing caused. The contested part is the numerator: 'caused' is decided by an attribution model, so two teams with identical spend and identical revenue can report very different ROI.
- How do you calculate marketing ROI?
- Attributed gross profit minus marketing cost, divided by marketing cost, over a window matched to the sales cycle. Using revenue rather than gross profit ignores the cost of delivering what was sold, and using a same-period window in a long-cycle business measures the wrong quarter.
- Why is marketing ROI so hard to measure?
- Because attribution is not causation. A model can tell you which touches preceded a purchase; it cannot tell you which were necessary. Much of the revenue credited to a channel would have arrived anyway, and the only reliable correction is incrementality testing.
- What is incrementality testing?
- Holding a channel, audience or geography out of a campaign and measuring the difference in outcome against a comparable group that received it. It answers what the spend actually caused rather than what it was present for, which is the question attribution models cannot answer.
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