Why a high ROAS tells you nothing on its own
The most common answer we get when we ask a store owner what their ROAS is: a number, with no context. "We're at 5." Fine, but 5 against what? A ROAS of 5 can be excellent for one business and a slow loss for another. The figure by itself doesn't tell you whether you're making or losing money.
The reason is simple: ROAS measures revenue generated per unit of ad spend, not profit. And profit depends on your gross margin, not on how good the number looks in the dashboard. Without a clear break-even point, you're optimizing blind.
The right question isn't "what's my ROAS". It's "above what ROAS do I start making profit". That's your break-even threshold, and it shifts from one business to the next.
What break-even ROAS actually is
Break-even ROAS, also called the minimum profitable ROAS or profitability threshold, is the exact value at which ad revenue covers precisely the cost of the goods sold through those ads. Below it you lose money. Above it, every extra unit of revenue carries profit.
The key point: this threshold isn't a universal industry number. It's set by your gross margin. A low-margin business needs a far higher ROAS to hit the same break-even point that a high-margin business reaches with a modest ROAS. That's why generic benchmarks like "good ROAS = 4" are misleading. For how the base metric is calculated, we covered what ROAS is and how to calculate it separately.
The break-even formula
There's just one formula, and it's worth memorizing:
Break-even ROAS = 1 / Gross margin (expressed as a decimal)
You calculate gross margin like this: take the selling price, subtract the cost of goods and variable costs (shipping, payment processing, returns), then divide by the selling price.
A few quick examples, so you can see how the threshold moves with margin:
- 20% margin: threshold = 1 / 0.20 = ROAS 5. Below 5 you lose money.
- 30% margin: threshold = 1 / 0.30 = ROAS 3.33.
- 40% margin: threshold = 1 / 0.40 = ROAS 2.5.
- 50% margin: threshold = 1 / 0.50 = ROAS 2.
- 70% margin: threshold = 1 / 0.70 = ROAS 1.43.
Notice the trend: the thinner the margin, the higher the threshold climbs. A business at 20% margin has to work two and a half times harder for the same result as one at 50%.
A step-by-step worked example
Take a store selling a product at €40. Cost of goods is €22, shipping and payment processing add €4. Total variable cost per order: €26.
1Calculate gross margin
Margin = (40 - 26) / 40 = 14 / 40 = 0.35, that is 35%
2Calculate the break-even threshold
Minimum ROAS = 1 / 0.35 = 2.86
Below ROAS 2.86, each order costs you more than it brings in.
3Set a real target, above the threshold
Target ROAS = 2.86 × 1.3 = roughly 3.7
Margin above the threshold covers fixed costs (rent, salaries, software) and leaves net profit.
The gap between threshold and target is essential. The threshold keeps you at zero. Real profit appears only from revenue above the threshold. A store running exactly at break-even loses nothing on advertising, but earns nothing to cover the rest of the business either.
Two businesses, same ROAS, opposite results
This is where ROAS without margin proves to be an empty number. Let's look at two stores with exactly the same ROAS of 4.
Store A: 45% margin
- Break-even point: ROAS 2.22
- Actual ROAS: 4
- Distance above threshold: comfortable
- Conclusion: profitable, has room to scale
Store B: 18% margin
- Break-even point: ROAS 5.56
- Actual ROAS: 4
- Distance above threshold: below it
- Conclusion: losing money on every order
Same reported figure, two opposite financial realities. Store A is making money and should raise its budget. Store B loses on every sale and should either lift its margin or cut unprofitable products, not pour more money into ads. The ROAS of 4 doesn't help you tell them apart. Margin does.
Why margin, not ROAS, decides whether you scale
The decision to grow your budget should never start from "we have a good ROAS". It should start from "we have a ROAS comfortably above the break-even point". The distance between actual ROAS and the threshold is your room to maneuver. The wider it is, the more aggressively you can scale without slipping into a loss when ROAS naturally falls at higher volumes.
Because ROAS almost always drops when you raise the budget: you reach colder audiences, you enter more expensive auctions. A high-margin business absorbs that drop and stays profitable. A low-margin one goes red straight away. That's exactly why, before any scaling decision, the first thing we analyze is margin, not the ROAS figure.
The next step after you've mastered break-even is moving from revenue to profit as your optimization metric. We covered that in depth in POAS vs ROAS, the metric that matters for profit. And if you want to see how break-even ties into full campaign reporting, read how to measure the results of your advertising campaigns.
The break-even point isn't set once
Margin shifts: suppliers raise prices, shipping costs fluctuate, returns vary by season. That means your break-even threshold isn't a constant you calculate once and forget. It's a number that needs recalculating whenever the cost structure moves. A store optimizing its campaigns against a threshold from a year ago can be losing money without realizing it, because the real margin has eroded since.
And the genuinely hard part isn't the formula, which is simple. It's having clean margin data per product or category, not a distorted average across the whole catalog. A catalog with margins ranging from 10% to 60% treated with a single average threshold will promote exactly the wrong products. The correct threshold is set per margin group, and there the decision shifts from math to account structure.
Frequently asked questions
What is the minimum profitable ROAS?
The minimum profitable ROAS, also called break-even ROAS or the profitability threshold, is the value at which ad revenue covers exactly the cost of goods sold, with no profit and no loss. Below this threshold you lose money on every order, above it you start making profit. Formula: minimum ROAS = 1 / gross margin (as a decimal). At a 25% margin, the threshold is ROAS 4.
How do I calculate my break-even ROAS?
You divide 1 by your gross margin expressed as a decimal. Gross margin = (selling price minus cost of goods minus variable costs) divided by selling price. For example, a product at €40 with cost of goods and variable costs of €26 has a 35% margin (0.35). Break-even ROAS = 1 / 0.35 = 2.86. Below ROAS 2.86, the campaign is at a loss.
Why can two businesses with the same ROAS have opposite profitability?
Because ROAS ignores gross margin, and the break-even threshold differs by margin. A business at 45% margin has its threshold at ROAS 2.22, so at ROAS 4 it makes comfortable profit. A business at 18% margin has its threshold at ROAS 5.56, so at the same ROAS 4 it loses money on every order. Same figure, two opposite financial realities. Margin decides, not ROAS.
What is a good average ROAS for eCommerce?
There is no universally good average ROAS, because the break-even threshold depends on your gross margin. Generic benchmarks like good ROAS equals 4 are misleading. A ROAS of 4 is excellent at a 45% margin and a loss at an 18% margin. Instead of an industry average ROAS, calculate your own threshold (1 / gross margin) and set a target 20-30% above it, to also cover fixed costs.
How do I decide whether I can scale my ad budget?
You look at the distance between your actual ROAS and the break-even threshold, not at the absolute ROAS. The wider that distance, the more room you have to grow the budget without slipping into a loss. ROAS almost always falls when you raise the budget, because you reach colder audiences and more expensive auctions. A comfortable margin above the threshold absorbs that drop. A thin margin pushes you into a loss immediately.
How often should I recalculate my break-even threshold?
Whenever your cost structure changes. The break-even point isn't a constant you calculate once and forget. Suppliers raise prices, shipping costs fluctuate, returns vary by season, and each of these shifts your gross margin and therefore your threshold. A store optimizing against a threshold from a year ago can be losing money without realizing it, because the real margin has eroded in the meantime.
At DAFE Digital we calculate your break-even point on your real margin, then optimise campaigns above it. We don't report a pretty ROAS that hides a loss.
A ROAS of 4 can be profit or loss, depending on your margin. We analyse margin per product group, set the correct break-even threshold and scale only where there's real room for profit.
Adela Mincea
Performance Marketer · Fondatoare DAFE Digital · Formator ANC
Adela is a Performance Marketer with 10+ years of paid media across Europe, the US and Asia. She founded DAFE Digital in 2023 after agency roles in London and Hong Kong, in-house work inside client organisations, and independent consulting across 27+ industries.
