Return On Ad Spend
Return on ad spend (ROAS) is revenue generated divided by advertising spend, expressed as a ratio (4:1) or a multiple ($4 for every $1 spent). It is used to evaluate the efficiency of paid campaigns at the channel, campaign, ad set, or creative level, and reported either on a same-day attribution basis or against a longer-tail cohort window. It is the headline number on most paid-acquisition dashboards and the most-misread metric in marketing finance.
The first thing to understand about ROAS is that it is a revenue ratio, not a profit ratio. ROI is profit-over-cost; ROAS is revenue-over-ad-cost and ignores cost of goods, fulfillment, payment fees, and every other margin component. A "4:1 ROAS" sounds great until you discover the product has a 25 percent gross margin, in which case the campaign is breaking even at best. The right way to set a ROAS target is to invert the gross margin: a business with a 25 percent gross margin needs a ROAS of 4 just to break even on the variable side; one with a 70 percent gross margin can profitably run campaigns at ROAS of 1.5 or 2. E-commerce DTC typically targets 3 to 5 blended ROAS, with new-customer ROAS often running 1 to 2 and repeat-customer ROAS running 5 to 10+ (Triple Whale, Northbeam published benchmarks). Subscription businesses report ROAS on a longer tail (90 day, 180 day, 365 day) because most of the revenue arrives after the click. The attribution window matters as much as the number: a 7-day same-click ROAS and a 30-day modeled ROAS for the same campaign can differ by 2x.
Ryan's Take
ROAS is the metric founders show their board when they don't want to talk about margin. It is technically a number; it is not always a useful one. A 6:1 ROAS on a low-margin product is worse for the business than a 2:1 ROAS on a high-margin product, but the 6:1 looks better in the deck. The honest version is "contribution margin per dollar of ad spend over the LTV window." That is harder to compute and nobody asks for it on Twitter, which is exactly why founders should compute it. The companies that scale paid sustainably are the ones who know their real margin-aware ROAS target and refuse to let agency dashboards talk them out of it.
What founders get wrong: Treating reported in-platform ROAS as truth. Meta and Google both over-report ROAS through last-click and modeled-conversion attribution, especially with iOS 14.5 changes; reported ROAS often runs 30 to 60 percent higher than incrementality-tested ROAS. Run periodic geo holdouts or lift tests to anchor the platform numbers to reality.
Related: Cost Per Acquisition · Cost Per Click · Paid Acquisition · LTV · CAC
FAQ
What is return on ad spend?
Revenue generated divided by advertising spend, expressed as a ratio (4:1) or a multiple ($4 per $1 spent). Used to evaluate paid campaign efficiency at the channel, campaign, ad set, or creative level. It is a revenue ratio, not a profit ratio.
What is a good ROAS?
Depends on gross margin. A 25% gross margin business needs ROAS of 4 just to break even on variable cost; a 70% gross margin business can profit at ROAS of 1.5 to 2. E-commerce DTC commonly targets 3-5 blended, with new-customer ROAS often 1-2 and repeat-customer ROAS 5-10+.
Is ROAS the same as ROI?
No. ROI is profit divided by cost; ROAS is revenue divided by ad cost and ignores COGS, fulfillment, payment fees, and overhead. A 4:1 ROAS on a 25% gross margin product is roughly break-even, not profitable. Always pair ROAS with the margin context.
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