What is Return on Ad Spend (ROAS)?
Return on ad spend (ROAS) is a metric that measures how much revenue is generated for each dollar spent on advertising. A ROAS of 4x means $4 in revenue for every $1 in ad spend.
Return on ad spend (ROAS) is a marketing metric that measures the revenue generated for every dollar spent on advertising. It's the most direct measure of whether a paid advertising campaign is financially productive.
$$\text{ROAS} = \frac{\text{Revenue from Ads}}{\text{Ad Spend}}$$
For example, if you spend $1,000 on Google Ads and those ads generate $5,000 in revenue, your ROAS is 5x (or 500%).
ROAS is the paid advertising equivalent of ROI (Return on Investment) — but while ROI accounts for all costs and profits, ROAS focuses specifically on the relationship between ad spend and the revenue it drives.
What Is a Good ROAS?
There is no universal "good" ROAS — it depends entirely on your gross margin and business model. A business with 60% gross margin needs lower ROAS to be profitable than one with 20% margins.
A simple way to calculate the minimum profitable ROAS:
$$\text{Break-even ROAS} = \frac{1}{\text{Gross Margin %}}$$
If your gross margin is 40%, you need at least a 2.5x ROAS just to break even on ad spend. Most businesses target ROAS well above break-even to also cover overhead.
| Gross Margin | Break-Even ROAS |
|---|---|
| 25% | 4x |
| 33% | 3x |
| 50% | 2x |
| 67% | 1.5x |
ROAS vs. ROI
| Metric | Formula | What It Measures |
|---|---|---|
| ROAS | Revenue ÷ Ad Spend | Revenue efficiency of ad spend |
| ROI | (Net Profit ÷ Total Investment) × 100 | Overall profitability of an investment |
ROAS ignores costs of goods sold, overhead, and other expenses — it only measures ad spend vs. revenue. ROI provides a fuller picture of profitability. Both are useful; ROAS is the standard metric in advertising platforms, while ROI is more useful for broader business analysis.
ROAS and Customer Lifetime Value
One common mistake is calculating ROAS only on first-purchase revenue. If customers make repeat purchases, the true ROAS of an acquisition campaign is higher when calculated on customer lifetime value (CLV) rather than just the initial order.
This is especially important for subscription businesses, where the first purchase may generate a low ROAS but the long-term customer relationship is highly profitable.
Target ROAS Bidding
Google Ads and Meta Ads both offer Target ROAS (tROAS) as an automated bidding strategy. You set a desired ROAS target and the platform's algorithm adjusts bids in real time to try to achieve it. This requires sufficient conversion and revenue data — typically at least 30–50 conversions per month — to function effectively.
ROAS should be tracked alongside cost per acquisition (CPA) and customer acquisition cost (CAC) to get a complete picture of advertising effectiveness. A high ROAS with very low sales volume may be less valuable than a moderate ROAS with high volume and strong repeat purchase rates.