ROAS · Return on Ad Spend
Return on Ad Spend
What is ROAS?
- Revenue per unit of ad spend (revenue ÷ ad spend)
- Revenue-based, so read it alongside margin and ROI
- In B2B, adjust for lead and pipeline contribution
Once you start tracking ROAS, the first thing that changes is the conversation in your ad meetings. Instead of impressions like “this creative seemed to do well,” the team looks at per-campaign numbers and decides on the spot what to turn off and where to put more budget. The biggest practical change is that the budget allocation cycle shrinks from quarterly to weekly. With ad spend and revenue data in a single table, performance judgments that used to rest on agency reports shift to a setup where the advertiser verifies results directly.
What to calculate first is not the target ROAS but the break-even ROAS. It is the inverse of the contribution margin rate: for a product that keeps 25% after costs and fees, you must exceed 400% just to break even, while for a subscription product with a 60% margin, anything above 167% is profitable. The same 300% can mean profit or loss depending on the product. Also, the ROAS a platform shows is a figure that credits itself within a set window, such as 7-day click and 1-day view, so when you run several channels the total can even exceed actual revenue.
In B2B, there are cases where this metric is hard to use as is. Customers rarely pay on the website directly; leads such as resource downloads or demo requests come first, so ad platforms report revenue as 0. In that case, it is more realistic to set up a pipeline ROAS that assigns a value to each lead stage as a stopgap. If, over the past six months, consultation requests converted to contracts at 12% and the average contract value was KRW 24 (≈ US$1) million, one consultation is worth an expected KRW 2.88 million (≈ US$2,150). Compare that with ad spend, and you can compare channels even before a contract is logged in the CRM.
Trouble usually starts when the instruction to “raise ROAS” is followed to the letter. If you pile budget onto retargeting and brand search terms, the number jumps to 1,000%, but much of that revenue is purchases that would have happened without the ads. New traffic dries up, and two or three months later total revenue collapses. Lose sight of the fact that ROAS is an efficiency metric, not a growth metric, and the mistake keeps repeating. B2B adds a time lag: teams often switch off a campaign because this month’s number is low, even though its contract would have closed four months later.
John KimInstructor John Kim, author of B2B Marketing Design and CEO of Nanum Consulting
Euijung KimBrand strategist with 30 years in advertising, formerly a division head at Daehong CommunicationsROAS became the standard measure of ad efficiency once digital advertising could track clicks and conversions precisely. It narrows the broader ROI concept of return on investment to “revenue per dollar of ad spend,” which makes it well suited to quick, campaign-level performance calls.
Consider a hypothetical case. Company A, an industrial filter manufacturer with 140 employees and KRW 32 billion (≈ US$23,941,300) in annual revenue, was spending KRW 12 million (≈ US$8,980) a month on search ads. The agency’s report showed ROAS holding steady at 450–600% every month. Yet the quote requests reaching the sales team had stayed flat at 7–8 a month for six months.
- When Marketing Manager Choi opened the revenue breakdown, 80% of the ROAS above 500% came from ads on the company’s own brand-name searches. These were existing customers who already knew Company A and searched for it by name.
- They reconciled the cost sheet with the finance team and reset the break-even ROAS. The filter product’s contribution margin was 28%, so break-even was 357%, and two campaigns the agency had called successes were below this line.
- The CEO said, “Let’s switch off the brand search ads for just two weeks and then talk.” When they did, that revenue fell by only 9%. That meant the rest was orders that would have come in without ads.
- The product-line keyword campaign is now evaluated by technical-document downloads instead of revenue. Team Lead Choi used past conversion rates to set the expected revenue per download at KRW 310,000 (≈ US$230) and compared that with ad spend.
- Three months later, ad spend was about the same at KRW 11.8 million (≈ US$8,830) a month, but quote requests rose to 19 a month, and revenue from new customers reached KRW 41 million (≈ US$30,700) for the quarter. In the report, ROAS had fallen from 610% to 380%.