ROAS (return on ad spend)
ROAS (return on ad spend) is a marketing metric that divides the revenue attributed to advertising by the cost of that advertising, expressed as a ratio or percentage — for example, $4 of revenue from $1 of spend is a 4x ROAS.
The formula is simple: ROAS = attributed revenue ÷ ad spend. If a campaign spent $2,000 and generated $8,000 in tracked revenue, ROAS is 4.0 (often written 400%). Google Ads, Meta, Microsoft Advertising and most analytics platforms report it natively once conversion values are being passed back, which is the real prerequisite — a campaign that only tracks conversion counts, not values, cannot report ROAS at all.
ROAS is not profit. It sits above cost of goods, shipping, payment fees, returns and salaries, so a 3x ROAS can be wildly profitable for a software product and loss-making for a retailer with a 30% gross margin. The practical way to use it is to calculate a break-even ROAS from your gross margin (1 ÷ margin) and treat that as the floor, then set the target above it. It is also attribution-dependent: last-click, data-driven and view-through models will each report a different ROAS for the same campaign, so the number is only comparable against itself, measured the same way over time.
Two other traps are worth naming. High ROAS often just means low volume — brand-keyword and remarketing campaigns flatter the average while capturing demand you would have won anyway. And ROAS moves inversely to scale: pushing budget into a campaign almost always lowers ROAS while raising total profit, which is why account-level ROAS targets should be paired with a revenue or volume goal rather than optimized in isolation.
With Opus Growth you can ask your AI assistant for ROAS by campaign, ad group, keyword or search term across Google Ads, Microsoft Advertising, TikTok and LinkedIn in plain language, then act on the answer in the same conversation — shifting budget, adjusting a tROAS target or pausing a losing ad group. Every write is shown as a dry run first and only applied when you approve it.
Frequently asked questions
There is no universal number. Break-even ROAS is 1 ÷ your gross margin, so a business with a 25% margin needs 4x just to cover product costs, while a 90%-margin software business breaks even near 1.1x. Set your target above your own break-even point, not against an industry average.
ROAS compares revenue to ad spend only. ROI compares profit to total cost, including cost of goods, fulfillment and overhead. ROAS is a media-efficiency metric; ROI is a business-outcome metric, and a campaign can have strong ROAS and negative ROI.
Extra budget buys less qualified auctions — broader queries, colder audiences, higher CPCs. Declining ROAS at higher spend is normal and often still profitable in absolute terms, so judge scale-ups on incremental profit rather than on the ratio alone.
