Start with the cafe's own economics rather than an industry promise. A useful ROI model connects incremental organic demand to a measurable business action, then applies realistic value assumptions and subtracts the full cost of the SEO program. Separate what is observed from what is estimated so the model remains auditable.
The source page framed the calculation around additional organic visits, conversion to an in-store or order-related action, and customer value over time. Keep that structure, but replace unsupported benchmark language with scenario inputs that the cafe can test against first-party data.
- Incremental organic activity: the source used 80-300 additional monthly website visits after 6 months as an illustrative range. Because no supporting study URL is present, treat that range as a historical example that requires source reconciliation. Build the model from the cafe's actual baseline and measured lift instead.
- Conversion assumption: the source referenced 5-15% for high-intent local searches. That figure is not supported by an immutable source URL here, so use it only as a previously published example. Prefer the cafe's own tracked calls, direction requests, orders, reservation actions where applicable, or other measurable conversion signals.
- Customer value: the source illustrated a customer spending $8 per visit, returning twice per week, and generating roughly $800 in annual revenue, then used 20 net-new regular customers as another example. These are modeling inputs, not evidence that SEO will create that behavior. Replace them with actual average order value, realistic revisit frequency, and contribution-margin assumptions when making a decision.
The important discipline is to keep the numerator and denominator aligned. If the model uses revenue from repeat visits, include the SEO cost over the same evaluation period and avoid treating gross revenue as profit. Where attribution is incomplete, show a range rather than a single precise answer.
This is a decision model, not a performance contract. Local demand, competitive intensity, menu economics, seasonality, execution quality, brand strength, and location count can all change the result.