Paid media
Return on ad spend
Return on ad spend is revenue divided by advertising cost, usually expressed as a ratio.
What is return on ad spend?
Return on ad spend is revenue divided by advertising cost, usually expressed as a ratio. It measures revenue efficiency and says nothing about profit unless margin is accounted for.
What turns on it
Optimising to it while margins vary across the catalogue reliably scales the products that lose money.
The mechanics
Made useful by feeding contribution margin rather than revenue into the conversion value, through custom labels or value rules, so the target reflects profit.
A frequent error
A healthy return on ad spend is compatible with falling profit. It is a revenue metric, and treating it as a profitability metric is the most common costly error in retail advertising.
Most disagreements about this turn out to be disagreements about the definition.
Where this comes up in the work
It is part of App Store Optimization, and more specifically of Apple Search Ads management. Across the rest of the work it shows up in:
- Marketplace Marketing, where getting it wrong shows up in localising beyond translation into how the category is described locally
- Content and Editorial: it is the reason mapping redirects before anything is deleted is scoped the way it is
- Lifecycle and Email, where it is the difference between treating the first fortnight as the window that decides repeat purchase working and appearing to
- Analytics and Measurement, where it quietly limits how far making the dashboard answer a question rather than display everything can go
What to check
Two questions that establish whether this is actually in order on a given site:
- Whether a change to it would be noticed, or discovered a quarter later
- Whether what the report says about it matches what a crawl of the site says
Common questions
Who should be responsible for return on ad spend?
It needs one named owner rather than a shared responsibility. The natural home is Ecommerce SEO, since structuring retail campaigns around margin rather than revenue is where the consequence lands.
What does fixing return on ad spend involve?
The diagnosis is cheap. The fix ranges from an afternoon to a project depending on how deep it sits in the build, and we scope the second after doing the first.
Should return on ad spend come before other work?
Before anything that depends on it, which is the test rather than a general ranking. Optimising to it while margins vary across the catalogue reliably scales the products that lose money.
How do you prove return on ad spend is worth fixing?
By measuring it rather than by argument. Made useful by feeding contribution margin rather than revenue into the conversion value, through custom labels or value rules, so the target reflects profit. The order most people need is Should we block AI crawlers? first, Should we use a website builder or WordPress? once the first one is running.
Is return on ad spend the same as anything else?
A healthy return on ad spend is compatible with falling profit. It is a revenue metric, and treating it as a profitability metric is the most common costly error in retail advertising. The distinction matters because the two are fixed differently. Most of the hard parts here are covered in Entity disambiguation, with the exceptions in Entity.
Will fixing return on ad spend move rankings?
Optimising to it while margins vary across the catalogue reliably scales the products that lose money. Whether that becomes a ranking change depends on what else is true about the site, which is why it is worth measuring rather than assuming. Where this gets detailed is Agentic Commerce for SaaS and technology; where it gets argued about is AI Automation and Workflows for SaaS and technology.
Ask what we would do first, and why
Share the site and the target. We will say what we would check first and what we would leave alone.