Breakeven ROAS Calculator

How the Break-Even ROAS Calculator works

The formula. Break-even ROAS = 1 ÷ contribution margin, with the margin as a fraction of the selling price. For example, a 40% margin gives 1 ÷ 0.40 = 2.5×, and a second example at 25% gives 4×. The same margin answers how many dollars you can spend to win an order: maximum CPA = selling price × contribution margin, so a $50 product at 40% can carry $20 of ad spend per sale.

Break-even ROAS is one divided by the contribution margin. If each order leaves you 47% after product cost, shipping and fees, you break even at 2.13× — every advertising dollar must return $2.13 in revenue before the campaign contributes anything.

Contribution margin, not gross margin, and certainly not price. The denominator must include everything that scales with an order: the product itself, inbound freight amortised per unit, packaging, pick and pack, outbound shipping you subsidise, payment processing, marketplace commission, and a realistic allowance for returns. Leaving out fulfilment and fees is the standard error, and it typically understates break-even ROAS by half a turn — enough to make a losing campaign look like a winning one for as long as the cash lasts.

Returns and discounts belong in the calculation. A 10% return rate on a physical product does not just remove 10% of revenue; it removes the revenue while leaving you the outbound shipping, the return shipping and often an unsellable unit. The cleanest treatment is to reduce the effective contribution by the return rate before dividing. The same applies to the discount codes attached to the campaign — a 15% welcome offer is part of the cost of acquiring that order, not a marketing expense elsewhere in the spreadsheet.

Break-even is a floor, and running at it is running for nothing. Break-even ROAS covers variable costs only. Fixed overhead — salaries, rent, software, the agency fee — is not in the number, so a campaign at exactly break-even contributes zero toward it. The target ROAS is always the higher figure that leaves a stated margin, and the gap between the two is where the business actually operates.

First-order ROAS is the wrong target for a repeat-purchase product. If a customer's second and third orders cost nothing to acquire, the sustainable target is set against lifetime contribution rather than the first order alone. Businesses with genuine repeat rates routinely run first-purchase campaigns below break-even on purpose, funded by the contribution from later orders. This only works where the repeat rate is measured rather than assumed, and where the cash position can carry the gap.

Attribution changes the number without changing the business. Platform-reported ROAS is consistently higher than the same figure computed from bank deposits, because platforms claim credit generously and different windows count different conversions. Break-even ROAS is an arithmetic fact about your margins; reported ROAS is a measurement with a bias. Comparing the two blended at the account level, against actual revenue, is the check that keeps the target honest.

Breakeven ROAS calculator table by selling price

Product cost $22, shipping $6 and a 3.5% payment fee, with only the selling price changing.

Break-even ROAS and maximum CPA at $22 product cost and $6 shipping

Sources: Return on advertising spend.

Checked against: 25% margin = breakeven ROAS 4.0

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