What is break-even ROAS
Break-even ROAS is the return on ad spend where your revenue from advertising exactly covers your product costs plus the ad cost itself. At that point you make no profit and no loss. Spend more efficiently and you profit; dip below it and every sale costs you money. It is the single most important number for any store running paid acquisition.
How to calculate it (the 1 ÷ margin rule)
First calculate your contribution margin — selling price minus every per-order variable cost (COGS, shipping, payment fees, packaging), divided by the price. Then:
Break-even ROAS = 1 ÷ contribution margin
A product with a 40% contribution margin breaks even at 2.5×. One with a 25% margin needs 4.0×. The thinner your margin, the harder your ads have to work.
Break-even vs target ROAS
Break-even keeps you at zero. To actually make money you need a target ROAS that bakes in your desired profit margin:
Target ROAS = 1 ÷ (contribution margin − desired margin)
If your desired margin is larger than your contribution margin, no amount of ad efficiency gets you there — you have to lower costs or raise your price first.
How Shopify fees change your number
Payment processing fees — typically 2.9% + $0.30 on Shopify Payments, plus a third-party gateway surcharge if you use an outside processor — come directly out of your margin. Operators who forget them calculate a break-even ROAS that's too optimistic, bid too high, and lose money without realizing it. This tool includes fees by default so your number is honest.
Why returns wreck your real ROAS
A returned order still consumed ad spend and shipping but returns no net revenue. As your return rate climbs, the ROAS you need on the orders that stick rises with it. We show a returns-adjusted break-even as a simplified first-order estimate: break-even ROAS ÷ (1 − return rate). For high-return categories like apparel, this gap is often the difference between profit and loss.
Per-product vs blended margins
One blended margin across your whole catalog is convenient but dangerous — it hides the SKUs quietly losing money at your average ROAS. The Catalog tab weights each product by its real sales mix, computes a blended break-even ROAS, and flags your thinnest-margin product so you know exactly where to reprice or pull back spend.
Frequently asked questions
- What is break-even ROAS?
- Break-even ROAS is the return on ad spend at which your advertising revenue exactly covers the cost of the product plus the ad cost — you make zero profit and zero loss. Below it you lose money on every sale; above it you start earning. It equals 1 divided by your contribution margin.
- How do I calculate break-even ROAS?
- Use the 1 ÷ margin rule. First find your contribution margin: selling price minus COGS, shipping, payment fees, and other per-order costs, divided by the price. Then break-even ROAS = 1 ÷ contribution margin. A 50% margin means a 2.0× break-even ROAS; a 33% margin means roughly 3.0×.
- What's the difference between break-even and target ROAS?
- Break-even ROAS keeps you at zero profit. Target ROAS is higher — it's the return you need to hit a specific net profit margin. The formula is 1 ÷ (contribution margin − desired margin). If your costs leave less margin than your profit goal, the target simply isn't achievable without cutting costs or raising price.
- How do Shopify fees change my break-even ROAS?
- Payment processing (e.g. 2.9% + $0.30 with Shopify Payments) and any third-party gateway surcharge come straight out of your contribution margin. Ignoring them makes your break-even ROAS look lower than it really is, so you bid too aggressively and quietly lose money. This calculator is fee-aware so your number reflects reality.
- Why do returns wreck my real ROAS?
- Every returned order still cost you ad spend, shipping, and often restocking — but generates no net revenue. A 10% return rate effectively raises the ROAS you must hit on the orders that stick. We show a returns-adjusted break-even (break-even ÷ (1 − return rate)) as a simple first-order estimate.
- Should I use one blended margin or per-product margins?
- A single blended number hides the products that are dragging you down. A high-margin hero can mask a thin-margin SKU that loses money at your average ROAS. Use the Catalog tab to weight by your actual sales mix and spot which SKUs need repricing or less ad spend.
- Is this calculator really free?
- Yes — free forever, no signup, no email gate. Every calculation runs entirely in your browser, so your numbers never leave your device.
Want help hitting these numbers on your store?
Get in touchEstimates only, based on the numbers you enter — not financial advice. Verify against your own books.