Return on Ad Spend Calculator
Determine how many dollars of revenue you earn for every dollar spent on advertising by dividing ad-attributed revenue by total ad spend. Use it to compare campaigns, set bidding targets, and justify budget allocation.
About this calculator
Return on Ad Spend (ROAS) tells you the gross revenue generated for each dollar invested in advertising. The formula is: ROAS = Revenue from Ads / Ad Spend. A ROAS of 4, for example, means you earned $4 in revenue for every $1 spent. Unlike ROI, ROAS does not account for product costs or operating expenses — it is a revenue efficiency metric, not a profitability metric. To assess true profitability, pair ROAS with your gross margin: if your margin is 30%, you need a ROAS above 3.33× just to break even. Platforms like Google Ads use Target ROAS bidding strategies, making this metric directly actionable in campaign settings.
How to use
Say you ran a Facebook campaign last month with a total ad spend of $2,400. The campaign drove $9,600 in tracked revenue via purchase events. Apply the formula: ROAS = $9,600 / $2,400 = 4.0. Your campaign returned $4 for every $1 spent. If your gross margin is 40%, break-even ROAS is 1 / 0.40 = 2.5, so a 4.0 ROAS is comfortably profitable. Now compare this to a Google search campaign with ROAS of 6.2 to prioritize budget toward the higher-returning channel.
Frequently asked questions
What is a good ROAS target for paid advertising?
A ROAS of 4:1 is often cited as a general benchmark, meaning $4 in revenue for every $1 in ad spend. However, the right target depends entirely on your gross margins and business model. A retailer with 25% margins needs a much higher ROAS to be profitable than a software company with 80% margins. Many e-commerce brands set a minimum ROAS equal to 1 divided by their gross margin percentage to ensure campaigns at least break even, then aim higher to generate real profit.
What is the difference between ROAS and ROI in advertising?
ROAS measures revenue earned relative to ad spend, while ROI measures net profit relative to total investment including cost of goods sold and operating expenses. ROAS = Revenue / Ad Spend, while ROI = (Net Profit / Total Investment) × 100. A campaign can show a strong ROAS of 5× while still being unprofitable if product costs and overhead are high. ROAS is useful for fast, campaign-level comparisons, but ROI gives the complete picture of whether a campaign actually makes money for the business.
How do I improve a low return on ad spend?
Low ROAS can be improved by working on either side of the equation — increasing revenue per click or reducing cost per click. On the revenue side, improving landing page conversion rate, average order value, and post-click upsells all raise the revenue attributed to your ads. On the cost side, refining audience targeting, improving ad quality scores, and pausing underperforming ad sets reduce wasted spend. It is also worth reviewing attribution windows — if your ROAS tracking window is too short, you may be undercounting revenue from customers who convert a few days after clicking.