ROAS and ROI answer different questions. ROAS asks how much attributed revenue came back for each dollar of ad spend. ROI asks whether the broader investment produced profit after the costs you decide to include.
Quick Answer
ROAS is usually best for campaign-level revenue efficiency. ROI is better for profitability decisions because it can include product cost, fulfillment, labor, tools, agency fees, overhead, or any other costs included in the analysis. There is not one universal ROI formula for every business context; the formula must define the investment and cost scope.
ROAS Formula
ROAS = attributed revenue / advertising spend.
If a campaign spends $5,000 and reports $20,000 in attributed revenue, ROAS is 4x, 4:1, or 400%.
ROAS does not tell you whether the campaign is profitable. It tells you how much reported revenue the ad spend produced under the reporting system being used.
ROI Formula
A common ROI structure is:
ROI = net return / investment x 100.
For a campaign profitability review, you might define net return as attributed revenue minus product cost, fulfillment, payment fees, returns, and ad spend. For a broader business review, you might include staff, software, agency costs, and overhead. The important thing is to state what is included before comparing ROI across campaigns or teams.
Example
A campaign spends $10,000 and reports $50,000 in attributed revenue. ROAS is 5x. If direct product and fulfillment costs are $35,000, the campaign has $5,000 left after ad spend and direct costs. That may be positive at the contribution level, but it may still be weak after overhead, returns, or agency fees.
This is why a campaign can have high ROAS and modest or negative ROI depending on the cost scope. Use the ROAS Calculator for the revenue ratio and the ROI Calculator when broader costs matter.
When To Use Each Metric
| Use ROAS when | Use ROI when |
| You are comparing campaign revenue efficiency. | You are deciding whether growth is profitable. |
| You need a fast ad-platform performance signal. | You need to include costs beyond media spend. |
| Revenue tracking is reliable and the cost scope is simple. | Returns, fulfillment, discounts, or overhead materially change the outcome. |
| You are setting or reviewing target ROAS bidding. | You are reporting financial impact to the business. |
How Break-even ROAS Connects Them
Break-even ROAS translates margin into a minimum revenue multiple. Under the simplified model, break-even ROAS = 1 / margin fraction. That gives ROAS a profitability floor, but only for the costs included in the margin input. The Break-even ROAS Calculator follows this same simplified margin relationship.
Sources and Methodology
This article uses official platform documentation for ad reporting concepts and presents ROI as a scoped financial calculation rather than one mandatory universal formula.
