How to Calculate ROAS and Find Your Break-Even Target

ROAS (Return on Ad Spend) is the single most-reported metric in digital advertising, and also one of the most misunderstood. A 4× ROAS sounds great — but whether it's actually profitable depends entirely on your margins. Here's how to calculate ROAS, find your break-even target, and use it alongside ACoS.

ROAS Formula

ROAS = Revenue Generated from Ads ÷ Ad Spend

ROAS is usually expressed as a multiplier (e.g., 4×) or a percentage (e.g., 400%).

Example:

• Ad spend in November: $2,500
• Revenue attributed to ads: $10,000
• ROAS = $10,000 ÷ $2,500 = 4× (400%)

What Does ROAS Actually Mean?

A 4× ROAS means for every $1 spent on advertising, you received $4 in revenue. But revenue is not profit. From that $4 in revenue, you still need to pay:

• Cost of goods sold
• Fulfillment and shipping
• Platform fees
• Returns

This is why a 4× ROAS is great for a 30% margin business but losing money for a 15% margin business.

Break-Even ROAS

Break-even ROAS is the minimum ROAS required to cover all costs excluding ad spend:

Break-Even ROAS = 1 ÷ Gross Margin (as a decimal)

If your margin is 30% and your ROAS is 3×, you're below break-even and losing money on ads. If ROAS is 5×, you're well above break-even and profitable.

ROAS vs ACoS: Two Sides of the Same Coin

ROAS and ACoS (Advertising Cost of Sale) measure the same efficiency from opposite angles:

ROAS = 1 ÷ ACoS    (when ACoS is expressed as a decimal) ACoS = 1 ÷ ROAS

Amazon sellers typically use ACoS because the Seller Central dashboard shows it natively. Google and Meta advertisers use ROAS because those platforms report in ROAS. Same math, different framing.

ROAS vs ROI: What's the Difference?

ROAS ignores all costs except ad spend. ROI accounts for all costs:

ROI = (Revenue − Total Cost) ÷ Total Cost × 100

Total cost includes COGS, fulfillment, platform fees, and ad spend. ROI tells you the true profitability of the campaign. ROAS tells you the efficiency of the ad spend in isolation.

Use ROAS to optimize campaigns and compare ad channels. Use ROI to evaluate whether the channel is worth investing in at all.

Target ROAS by Channel

These are averages — your break-even ROAS is what matters for your specific margin. Always know your number before running campaigns.

Frequently Asked Questions

What is a good ROAS for e-commerce?

It depends on your margin. The minimum profitable ROAS = 1 ÷ Gross Margin. With 30% margin, you need ROAS above 3.33× to profit. Most brands target 3–5× for paid social and 5–10× for search/shopping.

How do you calculate ROAS?

ROAS = Revenue from Ads ÷ Ad Spend. $4,000 revenue on $1,000 spend = 4× ROAS.

What is the difference between ROAS and ROI?

ROAS measures revenue per ad dollar. ROI measures profit relative to total cost invested. ROAS is for optimizing campaigns; ROI is for evaluating total profitability.

What is the relationship between ROAS and ACoS?

ROAS = 1 ÷ ACoS (as a decimal). A 25% ACoS = 4× ROAS. Amazon uses ACoS; Google/Meta use ROAS. Same metric, different expression.