Quick Definition #
ROAS (Return on Ad Spend) measures attributed revenue relative to advertising spend. ROI (Return on Investment) measures profit relative to the investment cost, using a clearly defined cost and return scope.
ROAS Formula #
ROAS = Attributed Revenue ÷ Ad Spend
As a percentage: ROAS % = (Attributed Revenue ÷ Ad Spend) × 100.
Example: ₹60,000 attributed revenue ÷ ₹15,000 ad spend = 4.0 ROAS, often described as 4:1 or 400% of ad spend. This does not mean the business earned ₹45,000 profit; product costs and other expenses are not included in ROAS.
ROI Formula #
ROI = (Return − Total Investment Cost) ÷ Total Investment Cost × 100
Example: a campaign produces ₹60,000 revenue, with ₹15,000 ad spend and ₹25,000 in product/service and other included costs. If total cost is ₹40,000, net return is ₹20,000 and ROI is (₹20,000 ÷ ₹40,000) × 100 = 50%. The calculation is only meaningful if the included costs and revenue are defined consistently.
ROAS vs ROI #
| Metric | Numerator / basis | Includes costs beyond ads? |
|---|---|---|
| ROAS | Attributed revenue divided by ad spend | Usually no |
| ROI | Net return relative to total investment cost | Should include relevant costs in the chosen definition |
Why Attribution Matters #
Revenue attributed by an ad platform may differ from total business revenue because platforms use attribution models, conversion windows and data signals. Avoid adding revenue from multiple platforms together without checking for double counting.
Practical Evaluation #
- Confirm conversion tracking and revenue values are accurate.
- Define the attribution model and reporting period.
- Calculate ROAS using comparable revenue and ad spend.
- Include product/service costs and other relevant expenses for ROI.
- Compare results against margins, targets and business constraints.
Common Mistakes #
- Calling ROAS profit.
- Calculating ROI using revenue but ignoring costs.
- Comparing campaigns with different attribution settings.
- Ignoring refunds, cancellations or lead quality.
- Assuming a high ROAS automatically means the business is profitable.
Key Takeaway #
ROAS shows revenue efficiency against ad spend; ROI evaluates return after the costs included in the analysis. Both require reliable tracking and clearly defined inputs.
FAQs #
Is 400% ROAS the same as 400% ROI? #
No. 400% ROAS means attributed revenue is four times ad spend. ROI requires subtracting the defined investment costs.
What is a good ROAS? #
It depends on margins, operating costs, attribution and the business objective. A break-even target should be based on actual economics.
Related Topics #
See CPC, CPM, CTR and CPA and Conversion Tracking.
