Break-even ROAS: the number to actually optimise to
Most teams optimise to a ROAS target somebody picked in a meeting. The correct target is derived from your contribution margin, and it is usually not the number on the whiteboard.
Break-even ROAS = 1 ÷ contribution margin %
At a 40% contribution margin your break-even ROAS is 2.5x. Below it you lose money on every sale; above it you make money. A ROAS target that is not derived from your margin is a number somebody guessed.
Contribution margin, not gross margin. Subtract COGS, shipping, payment fees, pick-and-pack and returns.
“We target 3x ROAS” is a sentence you hear constantly. Ask where the 3 came from and the answer is usually that it sounded about right, or that a previous agency said so.
The correct target is derived, and deriving it takes two minutes.
The formula
Break-even ROAS = 1 ÷ contribution margin %
Contribution margin is what is left of a sale after everything that varies with the unit:
contribution = price − COGS − shipping − payment fees − fulfilment − returns provision
margin % = contribution ÷ price
Worked example on a $100 product:
| Line | Amount |
|---|---|
| Price | $100.00 |
| COGS | −$32.00 |
| Shipping | −$9.00 |
| Payment fees (2.9% + $0.30) | −$3.20 |
| Pick and pack | −$2.50 |
| Returns provision (8%) | −$8.00 |
| Contribution | $45.30 |
| Margin | 45.3% |
| Break-even ROAS | 2.21x |
Below 2.21x you lose money on every incremental sale. The team targeting 3x is fine. The team targeting 1.8x because “we’re buying market share” is buying it at a rate that never stops costing.
Gross margin is the wrong input
This is the single most common error, and it always errs in the same direction.
Gross margin typically covers price minus COGS. It excludes shipping, payment processing, fulfilment and returns — which for DTC frequently total 8 to 15 percentage points.
| Input | Margin | Break-even ROAS |
|---|---|---|
| Gross margin | 68% | 1.47x |
| Contribution margin | 45.3% | 2.21x |
That is a 50% error in the target, in the direction that loses money. It is worth checking which one your team is actually using.
Break-even is a floor, not a goal
Break-even ROAS means the ad paid for the product and nothing else. Overhead, salaries and rent are not covered. Profit is zero.
The right target depends entirely on repeat purchase:
No repeat purchase. You need meaningful margin above break-even, because the first sale is the only sale. Target ROAS for a 20% net margin:
target ROAS = price ÷ (contribution − 0.20 × price)
On the example above: 100 ÷ (45.30 − 20) = 3.95x.
Strong repeat or subscription. Buying at or below break-even on the first order can be entirely correct, provided you know your payback period and can fund the cash gap. This is the standard subscription play, and it kills companies that run it without watching the cash valley.
That second case is where CAC payback matters more than ROAS — it tells you how many months you are underwater and how deep the trough goes before it turns.
Where blended and channel targets differ
Break-even ROAS is a unit economics figure. It does not care about attribution at all.
Your measured ROAS is what depends on attribution — and if your tracking under-counts conversions, your measured ROAS is understated and you will pause campaigns that are clearing the bar.
That is why the two problems are worth separating:
- Break-even ROAS — arithmetic. Cannot be wrong if your costs are right.
- Measured ROAS — measurement. Wrong by whatever your attribution loses.
Fix the second one before concluding a campaign fails the first.
The three numbers together
- Break-even ROAS — the multiple you need at your margin. (calculator)
- True CAC — what you are actually paying per customer. (how to measure it)
- Payback period — how long until it comes back, and how deep the cash valley gets. (calculator)
Only the second depends on attribution. The other two are arithmetic you can do this afternoon, and doing them changes what you conclude from the first.
Industry presets, pre-loaded with benchmark economics by niche, are on the break-even ROAS calculator if you want a defensible starting point rather than a blank form.
Frequently asked questions
What counts as contribution margin?
Price minus COGS, shipping, payment processing fees, fulfilment and expected returns. Everything that varies with the unit. Not overhead, not salaries, not rent.
Why not gross margin?
Gross margin usually excludes shipping and payment fees, which for DTC can be 8–15 percentage points. Using it produces a break-even target that is meaningfully too low.
Should I target break-even ROAS?
Only if you have repeat purchase or subscription revenue behind it. On a one-off purchase, break-even means zero contribution to overhead — you need a margin above it. On strong repeat, buying near break-even on the first order can be correct.
How do returns change it?
Substantially. At a 20% return rate you keep 80% of the revenue and often still pay the outbound shipping. Model returns inside contribution margin or your target will be optimistic.
What about the attribution problem?
Break-even ROAS is the threshold and does not depend on attribution at all. Your measured ROAS is what depends on it — which is why the two problems are worth keeping separate.
Calculate yours with your real numbers
Enter price, COGS, shipping and fees. The calculator returns your break-even and target ROAS instantly, with benchmark presets by industry.
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