You pull up the ad account at the end of the month and the number looks fine. Cost per click is down, click-through rate is up a little, and you feel like you did something right. But what, exactly? The dashboard won't tell you. It will tell you that people clicked more often this month than last, not whether it was the new photo, the new headline, the slightly lower price you tested, or the fact that it happened to run during a cold snap when everyone suddenly needed a plumber.
That gap, between a result and a reason, is the real work of judging an ad after it's already run. Most owners either over-credit the creative (the new ad is great, look at these numbers) or under-credit it (the numbers are fine, must be the algorithm). Both moves skip the harder question: what part of this ad actually caused what happened.
Why the metric and the creative aren't the same thing.
A click-through rate measures a decision: did someone, looking at your ad in a feed full of other things, stop and tap it. That's useful. It's also incomplete, because dozens of things influence that decision besides the ad itself: who Facebook or Google showed it to, what else was in their feed that day, whether your competitor ran a sale the same week, whether the picture simply looked different from everything around it regardless of whether it was a good picture.
This is part of why academic researchers still haven't settled on a clean way to measure creative quality on its own. John B. Ford, writing in the Journal of Advertising Research, notes that quantifying creativity remains an unresolved methodological challenge in advertising research, even as academic and industry approaches to judging creative work have started to converge. In plain terms: even researchers with full datasets and years of study still struggle to isolate creative quality from everything else around it. If researchers with full datasets and years of study still argue about how to isolate the creative's contribution, a business owner staring at a weekly report should take the number as a clue, not a verdict. What you need instead is a second opinion that catches what the data can't, and an outside read on your ad is what Knowing is built to give.
What the research says creative is actually worth.
The honest answer is: a lot, but the split between creative and everything else moves depending on where the ad runs. Nielsen and NCS (a media research firm) data cited by Marketing Charts found that creative quality, messaging, and context together drive 49% of a brand's in-store sales lift from advertising, with media buying decisions responsible for the rest. That's down from 65% in a 2006 study of the same kind, which the piece attributes to media planning getting smarter over time, not creative mattering less in absolute terms.
The split changes by channel. For television, the report found media now contributes slightly more to sales lift (50%) than creative (37%), because TV creative has leveled off at a consistent quality. For digital, video, display, and mobile, including Facebook and Instagram ads, creative still dominates at 56% of sales lift against just 30% for media, because digital creative quality varies so much more from one ad to the next. If you're running Facebook or Instagram ads, in other words, the creative is doing more of the heavy lifting than the targeting is, which cuts against the instinct to keep tweaking the audience settings instead of the ad itself.
The creative isn't competing with the media plan for credit. In digital advertising specifically, it's usually winning.
Meta's own research, published through Facebook IQ, cites a Nielsen figure of 56% and a Google figure of 70% for creative's share of campaign ROI, both secondhand citations rather than primary studies Meta ran itself. More concretely, Meta and the analytics firm Nepa found that following creative best practices drove a 1.2 to 2.7 times increase in long-term sales and 1.2 to 7.4 times in short-term sales. In a case study on Nestle's Kit Kat Spain campaign, adding a creative-quality score to the usual sales model showed that high-scoring creative was 12% more effective at driving sales than low-scoring creative running under otherwise similar conditions. That 12% is the kind of number a dashboard alone would never surface, because it required a model built specifically to separate creative's effect from media's.
A local business runs the same offer through two ad sets with different photos. If one photo pulls a noticeably lower cost per booked job while everything else, budget, audience, placement, stays the same, that's a real signal about the creative. If the two ad sets also ran in different weeks or to different audiences, the comparison is contaminated and the gap could be coming from somewhere else entirely.
Why yesterday's winning formula might already be wrong.
Even when you do isolate the creative's effect cleanly, there's a further complication: what worked before may not work now. Nicole Hartnett, Rachel Kennedy, and Byron Sharp, writing in the Journal of Advertising, replicated a 1986 study of 1,000 commercials and over 150 creative devices, this time measuring devices against actual in-market short-term sales instead of copy-test scores. Their sample was 312 TV ads across multiple categories and countries, and the finding should make anyone nervous about treating an old winning ad as a permanent template: many of the creative devices that proved most or least effective in their study differed substantially from the original 1986 results.
The authors are direct about the implication: as in the 1986 study, no single creative device on its own reliably explains why an ad sold. There is no checklist, humor plus a jingle plus a celebrity doesn't add up to guaranteed sales, and whatever combination worked five years ago isn't owed continued success now. If an ad that performed well last year is quietly declining this year, the honest first guess isn't that the algorithm changed. It's that the thing that made the creative work has stopped being as persuasive, and nothing in the metrics will spell that out directly.
A warning from the awards circuit.
There's a sharper version of this same trap playing out at the top of the industry. Peter Field's analysis of 24 years of data from the IPA Effectiveness Databank, an advertising industry database tracking roughly 600 case studies including 121 creatively-awarded campaigns, found in reporting from Marketing Week that the effectiveness of award-winning creative is now at its lowest point in the dataset's history. Average large business effects for awarded campaigns fell from about 1.9 in 2008 to 1.4 in 2018, and the share of awarded campaigns evaluated over six months or less jumped from roughly 10% in 2002 to 25% in 2018, with short-term campaigns among the award winners rising from under 5% before 2010 to almost 40% by 2018.
Field's reading is that award judges have increasingly rewarded creative built to spike attention fast rather than creative built to move a market over time, and the data backs it up: award-winning ads used to turn attention into roughly 12 times as much market share gain; now that same attention only buys about 4 times as much, meaning the same spike in attention does far less for actual sales than it used to. The lesson scales down fine to a single local business. An ad that spikes your click-through rate for a week isn't automatically the ad that's quietly building the kind of reputation that gets you repeat customers eighteen months from now, and a dashboard checked weekly will almost always reward the first kind over the second.
What to actually do with a report full of numbers.
None of this means the numbers are useless, they're the only honest record of what happened. It means the numbers are a starting point for a question, not an answer to one. Before crediting or blaming the creative for a result, check what else moved at the same time: the audience, the placement, the offer, the season, the competition. Hold those steady and the creative's effect becomes visible. Let them drift and the dashboard will confidently tell you a story that isn't true.
That's also the case for looking at an ad closely before it runs rather than only after, since by the time the report lands, the money's already spent and the only thing left to do is guess at why.
Frequently asked
Common questions.
If an ad has a high click-through rate, does that mean the creative was good?
Not necessarily. A high click-through rate means people clicked, but factors like who saw the ad, what else was in their feed, and timing all shape that number. The creative may deserve credit, but the metric alone can't isolate its share from everything else happening around it.
How much of an ad's sales result actually comes from the creative versus the media plan?
It depends on the channel. Nielsen and NCS data reported by Marketing Charts found creative drives about 49% of sales lift overall, down from 65% in a 2006 study of the same kind, with media planning getting smarter over time. The split also varies by channel: about 56% for digital specifically, but only 37% for TV, where media buying now contributes more because TV creative quality has leveled off.
Can I reuse an ad that performed well last year?
Carefully. Research by Hartnett, Kennedy, and Sharp replicating a classic 1986 study found that the specific creative devices that work best change substantially over time. An approach that sold well several years ago isn't guaranteed to still work, and performance should be checked, not assumed.