How do billboards compare to in-store retail media for purchase intent and ROI?

Short answer

Billboards excel at brand awareness and mass reach, while in-store retail media drives stronger purchase intent and more measurable ROI by targeting shoppers at the point of purchase. The two channels work best in combination: billboards generate demand, in-store media captures it.

What each channel does and where it operates

Billboards are traditional out of home placements in public spaces. They reach consumers before they enter a store and are primarily built for brand awareness and demand generation. Digital billboards extend this to dynamic creative but remain external to the retail environment.

In-store retail media covers digital screens, kiosks, shelf signage, point-of-sale displays, and audio and video formats inside physical retail locations. These placements use retailer-owned first-party data to deliver relevant, personalized advertising at or near the moment a buying decision is made.

The core structural difference is proximity: billboards intercept people in their daily movement; in-store media intercepts them with a basket in hand.

Purchase intent: how each channel performs

Research consistently shows in-store retail media is superior at stimulating purchase intent. Roughly 37% of shoppers made a purchase after exposure to in-store media, and nearly two-thirds of shoppers reported buying after seeing in-store digital screens.

Billboards influence purchase intent indirectly. The temporal and physical gap between seeing a billboard and reaching a store means any effect on conversion is diffuse and harder to trace. This does not make billboards ineffective; it means their purchase intent contribution runs through brand familiarity and recall rather than immediate action.

In-store formats win on direct conversion because they reach shoppers who have already self-selected into a buying context. A shopper standing in a category aisle is a fundamentally different audience than a driver passing a roadside sign, even if both have seen the same brand before.

ROI and measurement differences

The measurement gap between the two channels is significant and shapes how marketers evaluate ROI.

In-store retail media connects ad exposure to purchase behavior through retailer data systems. Brands can track interactions from impression to transaction, calculate return on ad spend against actual sales, and optimize campaigns based on what converts. This closed-loop attribution makes ROI defensible and comparable across campaigns.

Billboards rely on third-party audience metrics, estimated reach figures, and brand lift studies. There is no direct mechanism to link a billboard impression to a specific purchase event. ROI is real but harder to isolate, which makes justifying spend more difficult in performance-focused budget conversations.

How the two channels fit together strategically

Neither channel is universally superior. The question is where in the purchase funnel a brand needs support.

Billboards are the stronger tool for building recognition at scale: reaching people across a market, sustaining top-of-mind awareness over time, and creating the brand familiarity that makes in-store media more effective when a shopper finally encounters it. A shopper who has seen a brand on billboards for weeks is more receptive to that brand's in-store promotion than a shopper who has never heard of it.

In-store retail media is the stronger tool for converting that awareness into a sale. Its targeting precision, proximity to the shelf, and measurement transparency make it better suited to the final phase of the purchase journey.

The most effective strategies treat these as complementary rather than competing. Billboards generate demand across a broad population; in-store media captures that demand at the moment it is actionable.

How AdQuick handles billboard advertising

Planning a billboard campaign alongside other media requires knowing where your audience is, what formats are available, and what results you can actually measure. billboard advertising through AdQuick gives brands access to inventory across markets, tools for comparing placements, and reporting that connects campaign activity to measurable outcomes. For brands building an awareness layer that feeds downstream conversion, having clear visibility into OOH performance makes it easier to evaluate how billboards complement in-store and other retail media investment.