How to read your ROAS (and when it's lying to you)
A 5x ROAS can be a triumph or a disaster. The number alone won't tell you which.
ROAS — return on ad spend — is simple arithmetic: revenue from ads divided by the cost of those ads. Spend €200, make €1,000, that's a 5x ROAS. It's the number every marketer quotes. It's also one of the easiest to misread.
What ROAS actually tells you
ROAS measures the immediate, trackable revenue a campaign generated for each euro spent. It's a fast, honest read on whether an ad is pulling its weight right now. Higher is generally better, and comparing ROAS across campaigns tells you where to shift budget.
Three ways ROAS lies
- It ignores margin. A 4x ROAS on a product with a 20% margin loses money; a 2x ROAS on a 70% margin product is pure profit. ROAS talks revenue, not profit — always translate it into margin before celebrating.
- It ignores attribution windows. Meta and Google each claim credit differently. The same sale can show up in both. Add up platform-reported ROAS and you'll "prove" you made more revenue than you actually did.
- It ignores the long game. Brand and awareness campaigns often show a weak ROAS because the payoff is a customer who buys next month, through a different channel. Judge them on that basis, not on same-day return.
ROAS answers "did this euro come back bigger?" — not "am I building a business?" Both questions matter.
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Set a target ROAS based on your margin, not a generic "4x is good" rule. Compare campaigns within the same platform and window. And pair ROAS with conversion tracking so you're measuring real completed purchases, not inflated platform estimates. Seen next to your true spend and return, ROAS becomes a steering wheel instead of a vanity trophy.