Return on ad spend (ROAS) measures how much revenue a campaign generates per unit spent on ads. It is expressed as a ratio, such as 4:1, or a multiple, such as 4x.
Why it matters
ROAS lets you compare campaigns and decide where to spend more. It is simple, but it uses revenue rather than profit, so a good-looking ROAS can still lose money after product costs, shipping and fees.
Many teams also track MER or blended ROAS across all channels, because platform-reported ROAS often claims credit for the same sale.
Example
Ad spend: $1,000
Revenue: $4,000
ROAS: 4000 / 1000 = 4.0 (4x)
Gross margin: 30%
Gross profit: $1,200
Net after ads: $200
The break-even ROAS here is 1 / 0.30, about 3.33.
Common mistakes
- Treating ROAS and ROI as the same; ROI includes all costs.
- Using attributed revenue that double-counts across channels.
- Setting a target ROAS without knowing your margins.
Related
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