Break-even ROAS = 1 ÷ contribution margin. If 40 cents of every sales dollar is left after product, shipping, fees and returns, your margin is 0.40 and your break-even ROAS is 2.5x. Below that, every order you buy with ads loses money. Above it, you keep the difference.
Return on ad spend is the most quoted number in paid media and one of the least useful on its own. It tells you how much revenue came back for each dollar of ads. It says nothing about what that revenue cost you to deliver. Two stores can both report a 3x ROAS while one is printing money and the other is paying customers to take its stock.
Break-even ROAS fixes that. It converts your costs into a single line in the sand, so that when Ads Manager says 3.1x you know immediately whether to scale, hold or stop.
What break-even ROAS actually measures
ROAS is revenue divided by ad spend. Break-even ROAS is the ROAS at which the profit left on an order, before advertising, is exactly equal to what you paid in ads to get it. Nothing gained, nothing lost.
The profit left before advertising has a name: contribution margin. It is what remains from an order after every cost that only exists because that order happened.
Break-even ROAS = 1 ÷ contribution margin
Variable costs are the ones that grow with each order:
- Product cost, including freight to get it to you and any duties.
- Shipping and packaging you pay for, minus any shipping the customer pays.
- Payment processing fees, usually a percentage plus a fixed amount per transaction.
- Returns and refunds, as an average allowance per order.
- Per-order fees such as marketplace commission, pick-and-pack or a subscription app that charges per order.
Rent, salaries, software and your own time are fixed costs. Leave them out for now. They come back when you set a target.
A worked example: the $60 order
Take a store with an average order value of $60 after discounts and before tax. Here is where that $60 goes.
| Line | Per order | Share of revenue |
|---|---|---|
| Revenue (after discounts, before tax) | $60.00 | 100% |
| Product cost | −$22.00 | 36.7% |
| Shipping and packaging | −$7.50 | 12.5% |
| Payment fees (2.9% + $0.30) | −$2.04 | 3.4% |
| Returns allowance (6%) | −$3.60 | 6.0% |
| Contribution margin | $24.86 | 41.4% |
The margin is 41.4%, so the break-even ROAS is 1 ÷ 0.414 = 2.41x. Put another way, this store can spend up to $24.86 in ads to win a $60 order before it starts losing money. That figure is the break-even CPA, and it is the same idea expressed in dollars.
Now watch what the same order looks like at three different ROAS figures:
| Reported ROAS | Ad cost per order | Profit per order | Verdict |
|---|---|---|---|
| 3.0x | $20.00 | $4.86 | Profitable, but only 8% of revenue |
| 2.5x | $24.00 | $0.86 | Working for free |
| 2.0x | $30.00 | −$5.14 | Paying people to buy |
A 3x ROAS sounds healthy. In this store it leaves $4.86 on a $60 sale, and that is before a single fixed cost is paid. This is the gap between what the dashboard celebrates and what the bank account shows.
Break-even ROAS by margin
Once you know your contribution margin, the conversion is fixed. Use this table as a sanity check.
| Contribution margin | Break-even ROAS | Typical of |
|---|---|---|
| 20% | 5.00x | Electronics, resold goods, heavy items |
| 30% | 3.33x | Food and drink, furniture |
| 40% | 2.50x | Apparel with free shipping |
| 50% | 2.00x | Own-brand accessories, home goods |
| 60% | 1.67x | Beauty and skincare |
| 70% | 1.43x | Digital products, high-margin supplements |
The categories are rough guides, not benchmarks. Your own invoices are the only source that matters. The useful lesson in the table is how steep the curve is at the low end: dropping from a 30% margin to 20% moves the bar from 3.33x to 5x. A free-shipping promotion or a supplier price rise can do that overnight.
From break-even to a target ROAS
Break-even is the floor, not the goal. To set a target, decide how much of each sale you need to keep after ads to cover fixed costs and leave a profit, then take it out of the margin before you divide.
If the $60 store needs to keep 10% of revenue after ads, the sum is 1 ÷ (0.414 − 0.10) = 3.18x. At that point each order contributes $6 toward overheads and profit. Now there are two lines to manage against:
- Above 3.18x: the campaign is paying its way. Scale it carefully and watch whether the ROAS holds as spend rises.
- Between 2.41x and 3.18x: you are covering costs but not building profit. Fix the offer, the creative or the landing page before adding budget.
- Below 2.41x: each order costs you money. Give it enough data to be sure, then cut or rebuild.
Why the ROAS in your dashboard is usually too high
Even with the right target, the number you compare it to needs a second look. Platform-reported ROAS tends to run high for four reasons.
The revenue may include tax and shipping
Depending on how your pixel or Conversions API is set up, the purchase value sent to the ad platform can include sales tax and shipping charges. Neither is money you keep. Check what your purchase event sends, and match your margin calculation to the same definition of revenue.
Returns are never subtracted
The platform records the sale on the day it happens. If the order comes back two weeks later, the reported ROAS does not change. Your returns allowance covers the average, but a campaign that attracts unusually high-return customers will look better than it is.
Several platforms claim the same order
If a customer saw a TikTok ad, clicked a Google ad and then bought from an email, all three may report the full sale. Add the dashboards together and you will count more revenue than the store took. I cover why in why Meta, Google and TikTok all claim the same sale.
Some of those customers would have bought anyway
Retargeting and branded search are especially good at taking credit for people who were already on their way to the checkout.
The practical defence is to track MER, the marketing efficiency ratio, alongside platform ROAS: total store revenue divided by total ad spend across every channel. It cannot be inflated by double counting. If each platform reports 3x but your MER is 2.2x, believe the MER, and compare that to your break-even.
First order or lifetime value?
Everything above treats each order in isolation. If customers reliably come back, you can afford to break even, or lose a little, on the first order and earn it back later. Subscription and consumable brands often do exactly this.
Two cautions before you lower your target on the strength of lifetime value:
- Use repeat revenue you have already measured, not a projection. Look at what a cohort of customers from twelve months ago actually spent in the following six months.
- Mind the cash. A purchase that pays back in month five still has to be funded in month one. Small stores run out of cash long before they run out of theoretical profit.
If you are unsure, hold first-order ROAS at or above break-even and treat repeat purchases as the profit.
How to put the number to work this week
- Calculate one margin per product group. A blended store average hides the fact that your bestseller might break even at 2x and your bundle at 4x.
- Write both numbers down, break-even and target, where everyone who touches the ad account can see them.
- Recalculate when anything changes: supplier prices, shipping rates, a sale, a free-shipping threshold. Discounts are the most common way a healthy margin quietly disappears, which is why discount stacking deserves its own check before any big promotion.
- Judge campaigns against the floor, not against each other. A 2.8x campaign on a 60%-margin product is far healthier than a 3.5x campaign on a 25%-margin one.
- Review MER weekly. It is the one number that tells you whether the whole machine is above water.
None of this needs a finance team. It needs four or five cost figures you already have and ten minutes with a calculator. Once the floor is on the page, a ROAS number stops being a score and becomes a decision.
Common questions
What is a good ROAS?
A good ROAS is any ROAS comfortably above your own break-even ROAS. A store with a 70% contribution margin breaks even at 1.43x, so 2.5x is excellent. A store with a 25% margin breaks even at 4x, so the same 2.5x loses money on every order. There is no universal benchmark worth copying.
Is break-even ROAS the same as a ROAS of 1?
No. A ROAS of 1 only means revenue equals ad spend. You still have to pay for the product, shipping, payment fees and returns. Break-even ROAS is the point where the money left after those costs exactly covers the ad spend, and it is always higher than 1.
Should I include fixed costs like salaries and software?
Not in break-even ROAS. Break-even ROAS uses variable costs only, the ones that rise with every order. Fixed costs belong in your target ROAS: decide how much profit per order you need to cover overheads, subtract it from your margin, and recalculate.
What is the difference between ROAS and MER?
ROAS is revenue attributed to one platform or campaign divided by its spend, as reported by that platform. MER, or marketing efficiency ratio, is total store revenue divided by total ad spend across every channel. MER cannot be inflated by double counting, so it is the better number to compare against your break-even point.
How do I calculate break-even CPA?
Multiply your average order value by your contribution margin. If the average order is $60 and the margin is 41.4%, the most you can pay to win an order without losing money is $24.86.
