return on ad spend

Return on Ad Spend

Revenue generated per dollar spent on advertising. Formula: revenue attributed to ads ÷ ad spend. A 4× ROAS means $4 in revenue per $1 spent. The acronym ROAS also exists as a stub entry; this entry provides full context.

When you'd see it: E-commerce and DTC brands as the primary efficiency metric for paid channels. Budget allocation decisions: 'Google is running 8× ROAS, Meta is at 3×' is an argument for shifting budget. ROAS targets are set based on gross margin — a thin-margin retailer needs 5-6× ROAS to break even on ad spend; a high-margin SaaS company may be profitable at 2×.

Why it matters: ROAS is the marketer's version of ROI — it answers 'is this channel generating more than it costs?' Unlike ROI, ROAS ignores non-ad costs, which makes it faster to calculate and useful for in-flight campaign optimization. It's the most commonly cited metric in paid media performance reviews.

Common mistakes: Confusing ROAS with profit. ROAS only compares revenue to ad spend — it ignores COGS, fulfillment, and overhead. A 4× ROAS on a 20% gross margin product is losing money. Also: trusting platform-reported ROAS at face value. Platforms apply their own attribution models and typically over-credit conversions, because they count every customer who saw an ad, not just customers the ad caused to buy.

Related CTR, CPC, CAC, multi-touch attribution, last-touch attribution