ROAS tells you how much revenue each dollar of advertising brought back. Spend 1,000 on ads, get 3,000 in sales, and the ROAS is 3 (or 300%). It ignores every other cost, so it is not profit; it is the number ad platforms optimise for, and you have to know which ROAS you need to actually make money.
Return on ad spend (ROAS) is revenue attributed to advertising divided by the cost of that advertising: ROAS = revenue ÷ ad spend, expressed as a ratio (3.0) or a percentage (300%). Unlike ROI, it does not subtract the spend or any other cost, so it measures how efficiently ads generate revenue, not whether the business makes money. A ROAS of 1.0 means the ads paid for themselves in revenue terms; for an affiliate whose revenue is the payout, that is break-even, while for an e-commerce advertiser it is a loss once product cost is counted.
The useful version is break-even ROAS: the ROAS at which margin covers ad spend. For a business with a 40% gross margin, break-even ROAS is 1 ÷ 0.40 = 2.5; anything below loses money. For an affiliate paid per conversion the margin is the whole payout, so break-even ROAS is 1.0 on approved revenue, plus whatever tools and fees must also be covered. Media buyers set targets above break-even to leave room for holds, refunds and the noise in attribution.
Ad platforms bid on it directly. Google Ads’ Target ROAS strategy sets bids to reach an average conversion value per unit of spend that the advertiser chooses, and Meta offers ROAS goals for value optimisation. Both depend on conversion values being reported back accurately and on attribution, which since Google’s 2023 move to data-driven attribution in Google Ads and GA4 distributes credit across touchpoints rather than giving it all to the last click. For affiliates running on these platforms, passing the actual payout (ideally the approved payout) back as conversion value is what makes value-based bidding work.
ROAS and ROI describe the same campaign from different sides. A 1.3 ROAS is a 30% ROI when the only cost is ad spend; with other costs the ROI is lower. Labelling which one a report uses prevents the most common spreadsheet error in media buying.
Three campaigns each spend 10,000 USD and report a ROAS of 2.0 (20,000 USD of attributed revenue).
| Who | Margin on revenue | Break-even ROAS | Profit at ROAS 2.0 |
|---|---|---|---|
| Affiliate on CPA (revenue = approved payout) | 100% | 1.0 | +10,000 USD |
| Software subscription (85% gross margin) | 85% | 1.18 | +7,000 USD |
| Fashion e-commerce (35% gross margin) | 35% | 2.86 | −3,000 USD |
The same ROAS is excellent for the affiliate, good for the software company and a loss for the store. That is why advertisers set different payouts and ROAS targets by vertical, and why an affiliate who runs e-commerce traffic for an advertiser’s brand campaigns should ask what ROAS the advertiser needs before promising performance. Numbers are illustrative.
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Any ROAS above your break-even, which depends on margin. For an affiliate paid per conversion, break-even is about 1.0 on approved revenue; for a store with 35% margin it is close to 2.9.
ROAS is revenue divided by ad spend; ROI is profit divided by cost. ROAS ignores other costs and does not subtract the spend, so the same campaign shows a higher ROAS than ROI.
A Google Ads bid strategy that sets bids to reach an average conversion value per unit of ad spend chosen by the advertiser. It requires accurate conversion values and enough conversion volume.
Yes, especially on platforms that bid on value. Report the approved payout as the conversion value, and set the target above 1.0 to cover holds, refunds and tools.
References are listed as plain text on purpose; look them up by title and publisher. Updated: 2026-10-06.
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