Break-Even ROAS Calculator
CheckedThe break even ROAS calculator converts your gross margin into the ROAS a campaign has to hit before it stops losing money, and the target for the profit you want. Free, no sign-up, and the result updates as you type.
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Most advertisers inherit a ROAS target from a podcast or an agency deck rather than from their own margin, then spend months optimising toward a number that was never theirs. Break-even ROAS is not an opinion: it is the reciprocal of gross margin. At a 40% margin every revenue dollar carries 40 cents of contribution, so a dollar of ad spend has to return $2.50 before the campaign has paid for itself. Below that ratio you are buying revenue with profit.
How it's calculated
Break-even ROAS = 1 ÷ gross margin Target ROAS = 1 ÷ (gross margin − target net margin)
LaTeX source
\text{Break-even ROAS} = \frac{1}{m} \qquad \text{Target ROAS} = \frac{1}{m - n} Worked examples
A 40% gross margin, break-even only
2.50× break-even ROAS
1 ÷ 0.40 is 2.50, so every dollar of ad spend must return $2.50 of revenue to be free. The same statement as an ACOS is simply the margin itself, 40%. On $10,000 of revenue that allows $4,000 of advertising — the entire gross profit — which is why 2.50× is a floor to stay above, not a target to aim at.
The numbers used
- Gross margin
- 40
- Target net margin
- 0
- Revenue for the period
- 10000
A 35% margin with a 10% net margin demanded
4.00× target ROAS
Break-even alone is 1 ÷ 0.35 = 2.86×. Reserving 10 points of net margin leaves only 25 points for ads, and 1 ÷ 0.25 is 4.00×. Asking for a tenth of revenue as profit raised the required ROAS by 40%, and cut the spend ceiling on $20,000 of revenue from $7,000 to $5,000. Profit targets bite far harder than they look.
The numbers used
- Gross margin
- 35
- Target net margin
- 10
- Revenue for the period
- 20000
Questions sellers ask
How do you calculate break-even ROAS?
Divide 1 by your gross margin expressed as a decimal. A 40% margin gives 1 ÷ 0.40 = 2.50×, a 25% margin gives 4.00×, and a 60% margin gives 1.67×. Gross margin here means what is left after product cost, marketplace and payment fees, and the shipping you absorb — everything that scales with each order. Overheads that do not move with volume stay out of it.
What is a good break-even ROAS?
A low one. Break-even ROAS is a cost of doing business, not an achievement, so a 1.67× break-even on a 60% margin business gives you far more room to bid than a 5.00× break-even on a 20% margin one. If your break-even ROAS is above 4×, the fix is usually pricing or COGS rather than campaign optimisation, because no amount of targeting changes the arithmetic.
What is the difference between break-even ROAS and break-even ACOS?
They are the same fact stated two ways. Break-even ACOS equals your gross margin percentage, and break-even ROAS is 100 divided by that. A 40% margin means a 40% break-even ACOS and a 2.50× break-even ROAS. Amazon sellers tend to work in ACOS, Google and Meta advertisers in ROAS, and mixing the two across channels is where reporting arguments start.
Should break-even ROAS use gross margin or contribution margin?
Contribution margin, if you have it. The right denominator is revenue minus every cost that scales with an order: goods, marketplace fees, payment processing, pick and pack, outbound shipping and expected returns. Leaving returns out is the most common omission and it flatters the number — a 5% return rate on a 40% margin pushes break-even ROAS from 2.50× to roughly 2.63×.
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