What ROAS Do I Need to Be Profitable? Work It Out From Your Margin

A good ROAS for your store is any ROAS above your break-even ROAS, and your break-even ROAS is 1 divided by your contribution margin before ad spend. A product that keeps 40% of its price after product cost, fees, shipping and returns breaks even at a 2.5 ROAS; one that keeps 25% needs 4.0 just to stand still.

That is why industry benchmarks are close to useless on their own. A 3.0 ROAS is excellent for one brand and a slow bleed for another. Here is how to calculate your own number, the target above it, and how the maths differs between Amazon and Shopify.

Why don't ROAS benchmarks tell you if you're profitable?

Benchmarks describe what other advertisers get, not what you need. Eightx, a DTC growth firm, publishes 2026 median platform ROAS figures of 2.5x for Meta and 4.2x for Google Shopping. If your break-even is 2.3, a 2.5 Meta ROAS is profitable. If your break-even is 3.5, the median is losing money on every order.

Two more problems with benchmarks:

• Platform ROAS is attributed, not proven. Eightx’s own warning: platform-reported ROAS “is systemically inflated after iOS 14 and tells you only what a channel claims.” You can be above break-even in Ads Manager and below it in your bank account.
• Margins vary more than ROAS does. Two brands at the same ROAS can have very different profit because one has a 70% gross margin and the other has 35%.

So start from your own unit economics.

How do you calculate break-even ROAS?

Three steps.

1. List every variable cost per order except advertising. Landed product cost (including freight and duty), marketplace or payment fees, fulfillment and shipping, packaging, and an allowance for returns and refunds.
2. Calculate contribution margin before ads. Price minus those costs, as a percentage of price.
3. Divide 1 by that percentage. That is break-even ROAS. Its inverse is break-even ACoS on Amazon.

Then set a target ROAS that leaves profit:

Target ROAS = 1 / (contribution margin % − target profit %)

If you keep 40% before ads and want 15% left after ads, you can spend 25% of revenue on ads, so target ROAS is 1 / 0.25 = 4.0.

Eightx frames the same idea using contribution margin tiers: their example has CM2 (after product, shipping and processing) of 43%, a CM3 target of 25%, leaving 18% of revenue for marketing, which gives a break-even ROAS of 1 / 0.18 = 5.6x. Same formula, stricter profit target.

Amazon vs Shopify: a worked example

Hypothetical numbers for one $40 product, sold both ways. Replace every line with your own.

Where the fee numbers come from: Amazon’s pricing page lists a 15% referral fee for Home and Kitchen (with a $0.30 minimum), with categories ranging from 5% to 45% and most between 8 and 15%. Shopify’s pricing page lists 2.9% + 30¢ for US online standard cards on the Basic plan, lower on higher plans. The FBA fee, shipping, pick/pack and storage figures above are assumptions; check your own FBA fee preview and shipping invoices, because these lines move break-even more than anything else.

On Amazon, break-even ACoS is simply the contribution margin: 38.75% in this example. A campaign at 30% ACoS is profitable on those orders; one at 45% is not.

Two things the table does not capture:

• Shopify customers can be emailed again. If a meaningful share reorder, you can accept a lower first-order ROAS, as long as you know your repeat rate rather than hoping for it.
• Amazon ad sales can lift organic rank. Some of the value of a Sponsored Products order shows up later as organic sales. That is why we track TACoS (ad spend divided by total sales) alongside ACoS. On one SKU we managed, $358K of ad spend ran at a 4.00 ROAS with TACoS under 10%, which is only meaningful because the margin supported it.

Should you use ROAS, MER or TACoS?

Each answers a different question, and we use all three.

Eightx’s summary is a sensible one: ROAS for channel tactics, MER for budget allocation, blended CAC for planning. Apply the same break-even logic to MER: if your blended contribution margin is 40%, MER below 2.5 means marketing as a whole is losing money, whatever each platform claims.

What mistakes make the ROAS target wrong?

• Using gross margin instead of contribution margin. Gross margin often ignores fees, shipping and returns. On Amazon that can overstate your margin badly: in the example above, the referral fee, FBA fee and storage alone take $13.30 of a $40 sale.
• Forgetting returns. Apparel and electronics return rates can wipe out the whole profit margin. Use your actual refund rate.
• Ignoring discounts. A 20% off promotion during a sale changes contribution margin, so break-even ROAS for that week is higher. Recalculate for promotional periods.
• One target for all products. A bundle at 55% margin and a single unit at 30% need different targets. Set them by SKU or by margin band.
• Treating break-even as the goal. Break-even ROAS is the floor for growth spend such as launches, not a long-term target. Above it, decide how much profit you want to keep.

What we'd do this week

1. Build the cost table above for your top five SKUs, using real invoices and the FBA fee preview or your carrier bills.
2. Write break-even and target ROAS next to each SKU, and break-even ACoS for Amazon.
3. Compare those targets with the last 30 days of ROAS by campaign. Flag anything below break-even that is not deliberately a launch or ranking campaign.
4. Calculate MER for the last three months. If platform ROAS looks healthy but MER is below your blended break-even, attribution is flattering you.
5. Raise bids only where ROAS sits well above target, and only after the listing converts. Our Amazon PPC team sets bid rules from exactly these numbers.

If the targets you calculate look impossible to hit, the problem is usually price or product cost, not advertising. That is a pricing and positioning conversation, and it is worth having before you raise spend.