Definitions people swap by accident
ROAS is usually attributed revenue divided by spend on ads. ROI pushes further toward profit—or at least pulls in costs beyond the ad bill.
When ROAS is fine on its own
Use it when margins are steady and you are testing bids, creatives, or landing pages inside one channel.
Quick reads beat perfect truth when you just need gut checks between reports.
When to widen beyond ROAS
Use ROI thinking when payroll, freelancers, SaaS bills, refunds, or product cost belong in the same decision.
For that, widen the numerator and denominator on purpose—not just the ads tab.
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