Digital signage sits in an awkward spot for finance conversations. It is obviously visible, vaguely beneficial, and rarely measured. That is fixable. You can put credible numbers on signage the same way you would on any channel: count the full cost, define what the screens are supposed to change, and test for that change honestly.
Start with the true cost
ROI calculations fail at the denominator more often than the numerator. The full cost of a signage estate includes more than the panels:
- Hardware: displays, media players, mounts, cabling, surge protection.
- Installation and any electrical or network work.
- Software: CMS licences or subscriptions per screen per month.
- Content: staff time or agency fees to produce and refresh creative, usually the largest ongoing cost and the most commonly ignored.
- Operations: electricity, connectivity, maintenance visits, and a replacement reserve, since panels and players do not last forever, especially in heat and humidity.
Spread the capital cost over a realistic life, three to five years for commercial gear, add the running costs, and you have a monthly figure per screen. Everything the screens achieve must clear that bar.
Define the job before you measure it
Different screens have different jobs, and each job has a different natural metric. A promotional screen in retail exists to lift sales of featured items. A menu board exists to raise average order value and speed the queue. A reception screen exists to reduce printed materials and front-desk questions. A corporate screen exists to get messages seen without another email. Write the job down per screen. A screen without a defined job cannot have an ROI, only a cost.
Sales lift: the gold standard
Where screens are meant to sell, the cleanest evidence is a controlled comparison using data you already have in your POS. Feature a product on screen for two weeks, remove it for two, and compare unit sales, repeating across several products and seasons to smooth out noise. If you operate more than one location, run the same promotion with screens in one store and without in another and compare the difference. Keep a log of exactly what played when, because attribution collapses without it.
Be honest about confounders: a promotion that also had a price cut, a public holiday, or a payday weekend in one period will mislead you. The goal is a defensible pattern across multiple tests, not a single spectacular number.
Do not forget the cost side of the ledger
Some of the strongest signage returns are savings rather than sales:
- Printing eliminated: posters, menu reprints, laminated notices, and the courier and installation costs around them.
- Staff time returned: hours previously spent swapping posters or answering questions the screen now answers.
- Waste reduced: end-of-day offers on fresh items that would otherwise be discarded.
- Errors avoided: no more selling at an outdated printed price.
These are easy to quantify and finance teams trust them, so count them first. In many businesses the savings alone cover the monthly cost per screen, and any sales lift is upside.
Attention metrics: useful, with caveats
Camera-based analytics can estimate footfall past a screen, glance rates, and dwell time. These are genuinely useful for comparing screen positions and creatives against each other: if position A earns triple the glances of position B, move the important content. Treat them as relative signals, not revenue. Respect privacy rules strictly, prefer on-device processing that stores only counts, and disclose clearly. If in doubt, playback logs plus POS data will get you most of the insight with none of the risk.
Build a simple quarterly review
Put it all in one page per quarter: cost per screen, the job of each screen, the tests run, the lift or savings observed, and the decision taken, keep, move, rework content, or retire. Screens that repeatedly fail their tests should be moved or switched off; that discipline is what makes the numbers credible. Measured this way, signage stops being a leap of faith and becomes what it should be: a channel that competes for budget on evidence, and usually wins it in the places where placement and content are taken seriously.
Signage stopped being a poster; it is now software with a screen. Explore the wider Graphic Supplies health ecosystem.
