What this calculator does
Break-even ROAS is the minimum return on ad spend a campaign needs to hit before it starts losing money, once the cost of the product itself is taken into account. It depends only on profit margin: a lower margin needs a higher ROAS to break even, because less of each sale is left over after covering the cost of goods.
This is the number that turns a plain ROAS figure into a profitability check. A ROAS of 3× sounds strong on its own, but it is a loss on a 20% margin product (which needs 5×) and a healthy profit on a 50% margin product (which only needs 2×).
The formula
Break-even ROAS is 1 divided by the profit margin expressed as a decimal. Target CPA restates the same threshold as a dollar figure: the average order value multiplied by the profit margin, which is the most a single sale can cost to acquire before it stops being profitable.
| Term | Meaning |
|---|---|
| Profit margin | The share of revenue left as profit after the cost of goods sold, before ad spend. |
| Break-even ROAS | The minimum ROAS needed to cover ad spend from that margin: 1 ÷ margin. |
| Target CPA | The maximum an average sale can cost to acquire and still break even: average order value × margin. |
The inputs explained
| Field | What to enter |
|---|---|
| Profit margin on revenue (%) | Your profit margin on revenue, before ad spend, as a percentage. |
| Average order value ($) | The average order value (revenue per sale) for the product or campaign. |
When to use it
Setting a realistic ROAS target
Working out break-even ROAS from actual margin gives a defensible minimum target, rather than picking a round number that has no connection to whether the campaign is actually profitable.
Deciding whether to run a campaign below break-even
Some campaigns are deliberately run at a loss to acquire new customers, on the assumption of repeat purchases later; knowing exactly how far below break-even a campaign sits makes that trade-off explicit rather than accidental.
Comparing products with different margins
The same advertising budget needs a very different ROAS to be worthwhile depending on which product’s margin it is being spent against.
Worked examples
Every figure in the tables below is produced by this page’s own calculator at build time, so the numbers and the tool always agree. Select any row to load that scenario.
How break-even ROAS and target CPA change with profit margin
A fixed $80 average order value, across a range of profit margins.
| Profit margin | Break-even ROAS | Target CPA at this margin |
|---|---|---|
| 10% | 10.00× | $8.00 |
| 20% | 5.00× | $16.00 |
| 30% | 3.33× | $24.00 |
| 40% | 2.50× | $32.00 |
| 50% | 2.00× | $40.00 |
| 60% | 1.67× | $48.00 |
How target CPA changes with average order value at a fixed margin
A fixed 30% margin, across a range of average order values.
| Average order value | Break-even ROAS | Target CPA at this margin |
|---|---|---|
| $40 | 3.33× | $12.00 |
| $60 | 3.33× | $18.00 |
| $80 | 3.33× | $24.00 |
| $120 | 3.33× | $36.00 |
| $160 | 3.33× | $48.00 |
| $240 | 3.33× | $72.00 |
Questions
Why does break-even ROAS depend only on margin and not on order value?
ROAS is a ratio of revenue to spend, and margin is itself a ratio of profit to revenue, so the order value cancels out of the break-even calculation. Order value only matters once you want the break-even point stated as a dollar CPA rather than a ratio.
What margin should I use: gross margin or something narrower?
Use whichever margin genuinely reflects the cost you need ad spend to cover. A narrower margin that also nets out fulfilment, payment fees or returns gives a more conservative and often more realistic break-even figure.
Is it ever fine to run a campaign below break-even ROAS?
Yes, deliberately, if the business expects future repeat purchases or lifetime value from the customer that will recover the initial shortfall. That should be a conscious decision based on those numbers, not an accident from not knowing the break-even point.
How does this relate to the ROAS calculator?
The ROAS calculator tells you what a campaign actually achieved; this calculator tells you what it needed to achieve, based on margin, in order to be profitable rather than merely revenue-positive.
To check an actual campaign against this threshold, use the ROAS calculator. For the equivalent cost-per-sale framing, see the CPA calculator.