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Return on ad spendRevenue generated for every $1 of ad spend, on a single campaign or channel.
ROAS (return on ad spend) is the revenue an ad campaign generates divided by what it cost. A 4× ROAS means every $1 of spend returned $4 of revenue. It measures revenue efficiency, not profit — a high ROAS can still lose money if your margin is thin.
In practice
ROAS moves for two reasons that look identical on a chart: revenue went up, or spend went down. A campaign you paused halfway through the month posts a flattering ROAS on the budget it did spend — which is why a number that jumps the week you cut spend is rarely the good news it looks like. Read it beside spend and revenue, never on its own.
It's also a platform's own account of its own work. Meta and Google will both claim the customer who saw an ad on Tuesday and searched your brand on Friday, so per-channel ROAS figures routinely add up to more revenue than you actually banked. That double-counting is exactly why blended ROAS and MER exist: divide total revenue by total spend and each sale can only be counted once.
Formula
ROAS = Ad revenue ÷ Ad spend
Example: $8,000 revenue from $2,000 spend = 4× ROAS.
What a good result depends on
‘Good’ depends on your margin: compare ROAS to your break-even ROAS, not a fixed benchmark.
Common mistakes
- Treating ROAS as profit — it ignores COGS, fees and shipping.
- Trusting per-platform ROAS as truth — every platform claims the same sale.
Questions people ask
- Is a 3× ROAS good?
- Only your margin can answer that. At a 33% contribution margin, 3× is roughly break-even; at 60% it's comfortably profitable. Work out your own break-even ROAS and judge against that rather than a benchmark from someone else's business.
- What's the difference between ROAS and ACoS?
- They're inverses of each other. ROAS is revenue ÷ spend; ACoS is spend ÷ revenue as a percentage. A 4× ROAS is the same performance as a 25% ACoS. Amazon sellers usually talk in ACoS, everyone else in ROAS.
- Why doesn't platform ROAS match my bank balance?
- Because it reports attributed revenue, not profit. It ignores product cost, shipping, fees and refunds, and every channel claims the same sale. Blended ROAS against total revenue is the honest cross-check.