Return on Ad Spend
Aussi : ROAS, Return on Advertising Spend, Advertising ROI
Return on Ad Spend (ROAS) measures the revenue generated for every unit of currency spent on advertising, calculated as revenue divided by ad cost.
What It Is
Return on Ad Spend (ROAS) is a marketing performance metric that quantifies how much revenue an advertising campaign produces relative to its cost. It is expressed as a ratio or multiple:
ROAS = Revenue Attributed to Ads / Ad Spend
A ROAS of 4 (often written 4:1 or 400%) means that for every 1 unit of currency spent on ads, the campaign returned 4 units in revenue.
Why it matters
ROAS is one of the most direct ways to evaluate whether advertising investments are paying off. It helps marketing leaders:
- Allocate budget toward the channels, campaigns, and audiences that generate the most revenue.
- Compare performance across platforms (search, social, display) using a common yardstick.
- Justify spend to finance teams by linking advertising activity to top line results.
- Set bidding targets in automated platforms that optimize toward a target ROAS.
How it is used in practice
ROAS is typically calculated at multiple levels: per ad, per campaign, per channel, and account wide. Key practical considerations:
- Revenue vs profit: ROAS uses revenue, not profit. A high ROAS can still be unprofitable if margins are thin. Many teams pair it with a break-even ROAS based on gross margin.
- Attribution: The revenue figure depends on the attribution model (last click, first click, data driven). Different models produce different ROAS numbers for the same campaign.
- Time windows: Conversions may happen days or weeks after a click, so the lookback window affects the result.
- Target ROAS: A common rule is that break-even ROAS equals 1 divided by the gross margin. If margin is 50 percent, break-even ROAS is 2.
Concrete Example
A retailer spends 10,000 on a paid search campaign over one month. The campaign drives 50,000 in attributed sales.
ROAS = 50,000 / 10,000 = 5 (or 500%)
If the product gross margin is 40 percent, break-even ROAS is 1 / 0.40 = 2.5. Since actual ROAS (5) exceeds break-even (2.5), the campaign is profitable and a candidate for increased budget.
Limitations
ROAS ignores costs beyond media (creative, fees, fulfillment), does not account for customer lifetime value, and can reward campaigns that simply capture demand that would have converted anyway.