How to Measure the True ROI of Your Marketing Channels
Short answer
True ROI requires estimating incremental revenue caused by the channel, not just attributed revenue. Combine clean cost data, a reliable revenue source of truth, and either controlled experiments or Marketing Mix Modeling.
Step-by-step approach
- Get accurate spend and accurate revenue (single source of truth).
- Calculate simple ROI / ROAS as a starting baseline.
- Measure or estimate incrementality (geo tests, lift studies, or MMM).
- Convert incremental revenue into contribution margin (after COGS, returns, variable costs).
- Compute incremental ROI and payback.
- Build response curves so you know the ROI of the next dollar, not just the average dollar.
Key principle
Platform ROAS tells you how the platform thinks it performed. Incremental ROI tells you how your business actually performed because of that spend. The second number is the one that should drive budget decisions.
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I help DTC brands replace platform-reported ROAS with incremental ROI and decision-ready budget recommendations.
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