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Formula
Divide attributed revenue by ad spend to measure advertising return.
Worked Example
Understanding Return on Ad Spend (ROAS)
- ROAS = revenue divided by ad spend. Above 1.0 means revenue exceeds ad cost
- Break-even ROAS depends on gross margin: 50% margin needs 2.0 ROAS, 25% margin needs 4.0
- ROAS ignores fulfillment and overhead costs, so high ROAS does not guarantee high profit
- Compare ROAS within channels, not across them, for meaningful optimization
Consider ROAS alongside gross margin and customer lifetime value for a complete picture of ad profitability.
You can also calculate changes using our CPM Calculator, CPC Calculator or ROI Calculator.
Frequently Asked Questions
Is higher ROAS always better?
Usually yes, but very high ROAS with low spend may mean under-investment. Scale, margin, and customer lifetime value all affect optimal ROAS targets.
What ROAS do I need to break even?
Break-even ROAS = 1 divided by gross margin. With 50% margin, you need 2.0 ROAS. With 33% margin, you need 3.0.
What is the difference between ROAS and ROI?
ROAS measures revenue per ad dollar. ROI measures profit per total investment. ROAS ignores non-ad costs while ROI considers all costs.
What is a good ROAS benchmark?
A general benchmark is 4:1, but this varies by industry and margin. Subscription businesses may accept lower initial ROAS due to lifetime value.
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