ROAS & Ad Break-Even Calculator
Calculate your ROAS, cost per acquisition, and the exact revenue needed to break even on any ad campaign.
ROAS looks impressive until you subtract cost of goods. A 4x ROAS sounds great, until your product margin is 30%, meaning break-even ROAS is 3.33x and your campaign is barely profitable. Always evaluate advertising performance against your actual margin, not just gross revenue return.
Break-even ROAS = 1 ÷ gross margin. At 40% margin, you need at least 2.5x ROAS just to cover the cost of goods sold. Anything below that loses money even before overhead.
What ROAS measures
ROAS (Return on Ad Spend) is the revenue generated per dollar spent on advertising: ROAS = Revenue ÷ Ad Spend. A $2,500 campaign that generates $9,800 in revenue has a ROAS of 3.92x (or 392%). ROAS is the primary metric most advertising platforms report, but it's a revenue metric, it doesn't account for your cost of goods or gross margin.
Break-even ROAS
Break-even ROAS is the minimum ROAS at which your advertising is not losing money on gross profit. The formula: Break-even ROAS = 1 ÷ gross margin. At 55% gross margin: 1 ÷ 0.55 = 1.82x. Any ROAS above 1.82x is profitable at the gross level. Any ROAS below 1.82x means you're losing gross profit on every dollar of ad spend, the more you spend, the more you lose. Knowing your break-even ROAS is the minimum required to evaluate any campaign.
ROAS vs ROI
ROAS measures revenue return. ROI measures profit return. A campaign with 4x ROAS and 25% margin has an ROI of 0% (you're breaking even). The same campaign at 55% margin has a gross ROI of 120% ($1,200 gross profit on $2,500 spend). ROAS is useful for comparing campaigns; ROI is more meaningful for evaluating business economics.
Cost per acquisition (CPA)
CPA measures the average cost to generate one conversion. CPA = Ad Spend ÷ Conversions. Lower CPA is better, but "good" CPA depends entirely on the value of a conversion. A $53 CPA is excellent for a $500 product and catastrophic for a $45 product. Compare CPA to average order value and customer lifetime value to assess whether acquisition cost is sustainable.
Scaling ads profitably
A campaign profitable at $2,500 spend may not be profitable at $25,000. Scaling ad spend typically requires bidding on less targeted audiences, which often increases CPA and decreases ROAS. When scaling, watch break-even ROAS closely, as campaigns scale, efficiency tends to drop. Building in a meaningful buffer above break-even at small scale provides room for efficiency loss at scale.
Frequently asked questions
What is a good ROAS?
It depends entirely on your margin. For a 30% margin business, break-even is 3.33x, so "good" starts at 4x or above. For a 60% margin business, break-even is 1.67x and 2.5x is solidly profitable. There is no universal "good ROAS", always evaluate against your specific margin structure.
Should I include shipping in the margin calculation?
Yes if you pay shipping costs. Gross margin for advertising purposes should reflect all variable costs of fulfilling an order, product cost, shipping, payment processing fees, and any variable fulfillment costs. The result is contribution margin, which is the more accurate denominator for break-even ROAS in an e-commerce context.
How do I improve ROAS?
Three levers: improve targeting (higher-quality audiences convert better at lower CPA), improve conversion rate (same traffic, more conversions, lower effective CPA), or improve average order value (same conversions, more revenue per conversion). ROAS = AOV × Conversion Rate ÷ CPC, improving any variable improves ROAS.