What "ROI" means when the deliverable is visibility, not clicks
AI visibility work does not generate a click you can tag in analytics. It changes what ChatGPT, Gemini, Perplexity and Google AI Overviews say about you when a prospect asks, which is closer to reputation work than paid search. That means ROI here is two linked numbers: a leading indicator, your Brand Mention Rate, which tells you whether the work is changing how often engines name you at all, and a lagging indicator, the revenue you can trace back to someone who arrived already trusting an AI recommendation. Track both. A single number without the other leaves you guessing.
The three numbers to record before you start
- Baseline Brand Mention Rate. Run the same set of realistic buyer prompts across the four major engines, in both languages if you operate bilingually, and record how often you are named against named competitors.
- The full cost of the work. The audit or retainer fee, plus any hours your team spends on the fixes it recommends: schema markup, directory profiles, content rewrites.
- A source field that includes AI. Add "an AI tool suggested you" as an explicit option in your intake form or sales script, next to referral, search and social. You cannot attribute what you never asked about.
How to attribute revenue without guessing
Once the source field exists, treat it like any other channel. When a lead selects the AI option, note the deal size if it closes. After a quarter, compare total closed value from that source against the cost recorded above. For example, a furniture retailer that closes just two or three AI-attributed orders a quarter, even at average order values, can often cover the full cost of a Standard audit and a season of fixes. That is illustrative, not a guarantee: your own source-field numbers will tell you the real figure. This works the same way in any industry, provided the source field is actually there to capture it.
How long to wait before judging the result
AI answers do not refresh as fast as a search results page. Give the work a full quarter and retest your Brand Mention Rate monthly rather than judging after the first retest. A single month of flat numbers with real fixes already in place is normal; a full quarter with no movement at all is the point to revisit the approach.
What counts as a good result
A rising Brand Mention Rate alongside at least one attributed lead or sale is evidence the spend is working, even before the numbers look dramatic. Categories with high deal values, real estate, clinics, law firms, need very few AI-attributed conversions to justify the work. Categories with high order volume and lower ticket size should expect the source field to fill in gradually across more deals rather than one large one. Both patterns show the spend is working. The real risk is skipping measurement altogether.