Practical guide
ROAS vs. ROI: What Each Metric Measures
ROAS compares attributed conversion value or revenue with advertising cost. ROI compares net return with the broader investment cost.
Published and reviewed by FBM Calculators Hub on .
ROAS measures advertising revenue efficiency
ROAS divides attributed advertising revenue or conversion value by ad spend. A result of 4.0 can be shown as 4:1, 4x, or 400%: four units of attributed value for each unit spent on advertising.
The numerator must match the measurement setup. If an advertising platform uses assigned lead values rather than completed sales revenue, the result is still useful for that setup but should not be described as cash revenue.
ROI measures net return against investment
ROI uses net profit in the numerator, so relevant costs are subtracted before comparison with investment cost. The exact scope depends on the decision: a campaign ROI may include advertising cost, product cost, fulfillment, agency fees, and other incremental expenses.
That broader cost scope is why a campaign can have positive ROAS while still losing money. Revenue above ad spend does not guarantee that gross profit covers every other cost.
Worked comparison
Suppose $5,000 of ad spend is attributed $20,000 of sales. ROAS is $20,000 ÷ $5,000, or 4x.
If product, fulfillment, platform, and ad costs together total $17,000, net profit is $3,000. Using $17,000 as the scoped investment cost gives an ROI of $3,000 ÷ $17,000, or 17.65%. Different cost scopes produce different ROI answers, so the scope must be stated.
Choose the metric for the decision
Use ROAS for comparing advertising value relative to spend when attribution and conversion values are consistent. Use ROI when deciding whether the complete investment produced enough profit for the risk and resources involved.
- Keep attribution windows consistent when comparing campaigns
- Confirm whether conversion value means revenue, gross profit, or assigned lead value
- Include refunds and cancellations when material
- Compare like-for-like periods and currencies
- Avoid treating platform-attributed results as a complete causal measurement
From ROAS to a break-even target
A rough break-even ROAS can be derived from contribution margin before advertising. If 40% of revenue remains after non-ad variable costs, advertising revenue must be about 2.5 times spend to cover the ad cost, because 1 ÷ 0.40 = 2.5. Fixed overhead, agency fees, taxes, and desired profit may require a higher operating target.