Break-Even ROAS Calculator
Find the minimum ROAS that covers your product and variable costs, based on your contribution margin — plus a target ROAS that builds in a desired profit margin.
Written by the CalcBundle Research & Editorial Team · Reviewed by the Quality Review Team · Transparent formulas · results are estimates, not advice. · Updated
Break-even ROAS
Enter a selling price greater than zero (or use the variable-cost % method).
What is a break-even ROAS calculator?
Break-even ROAS is the return on ad spend at which your advertising exactly pays for the cost of the goods and variable fees on the sales it drives. It is the single most useful number for setting advertising targets, because it tells you the floor below which ads lose money.
How is it calculated?
- Contribution margin % = 1 − variable costs ÷ selling price
- Break-even ROAS = 1 ÷ contribution margin %
- Target ROAS = 1 ÷ (contribution margin % − desired profit margin %)
You can enter itemised costs (product, shipping, payment and marketplace fees) or a single total variable-cost percentage.
Why margins drive break-even ROAS
A product with a 50% contribution margin breaks even at a 2.0x ROAS; one with a 25% margin needs 4.0x. That is why two sellers running the same ads can have completely different targets. Work out your margin first with the contribution margin calculator.
Break-even ROAS vs target ROAS
Break-even ROAS leaves zero profit. If you want, say, a 20% profit margin after advertising, your target ROAS is higher. The calculator computes both when you enter a desired margin.
Why break-even ROAS is the number to set targets around
Most advertisers pick a ROAS target by instinct or by copying a competitor, but the only target that means anything is the one derived from your own economics. Break-even ROAS turns a vague “we want a good return” into a precise floor: below it, every additional dollar of spend destroys value; above it, spend contributes to fixed costs and profit. This reframes the whole advertising decision. Instead of asking “is a 3x ROAS good?” you ask “is 3x above or below our break-even?” — a question that actually has a right answer for your business. Two sellers can look at the same 3x ROAS and one is thriving while the other is quietly losing money, purely because their margins, and therefore their break-even points, differ.
Worked example
A $100 product with $60 of variable costs has a 40% contribution margin, so its break-even ROAS is 1 ÷ 0.40 = 2.5x — at that return, ad revenue exactly covers the goods and fees. To also earn a 20% profit margin after advertising, the target ROAS rises to 1 ÷ (0.40 − 0.20) = 5.0x. Notice how sharply the target climbs: asking for 20 points of profit doubled the required ROAS, because that profit has to come out of the same 40% margin. Sellers with slimmer margins face even steeper targets, which is why margin work often does more for advertising viability than any change to the ads themselves.
Important caveat
Break-even ROAS means ad revenue covers variable costs — it does not guarantee the whole business is profitable, because fixed overhead (rent, salaries, software) still has to be paid. Compare your actual ROAS to this break-even figure.
Frequently asked questions
What is break-even ROAS?
Break-even ROAS is the minimum return on ad spend at which advertising revenue exactly covers your product and variable costs. Above it you contribute to fixed costs and profit; below it, ads lose money.
How is break-even ROAS calculated?
Break-even ROAS = 1 ÷ contribution margin %. If your contribution margin is 40%, your break-even ROAS is 1 ÷ 0.40 = 2.5x.
Why do margins affect break-even ROAS?
The thinner your margin, the more revenue each ad dollar must produce to cover costs, so break-even ROAS rises. High-margin products can be profitable at a much lower ROAS.
What is the difference between break-even ROAS and target ROAS?
Break-even ROAS covers costs with zero profit. Target ROAS builds in a desired profit margin, so it is higher than break-even ROAS.
Does break-even ROAS account for fixed costs?
No, and this is the single most important caveat. Break-even ROAS tells you when advertising covers the variable costs of the sales it drives — product, shipping, fees — but it says nothing about rent, salaries, software or other fixed overhead. A campaign running exactly at break-even ROAS contributes zero toward those fixed costs, so the business as a whole can still lose money. Think of break-even ROAS as the floor for a single campaign, not the threshold for overall profitability.
How should I use break-even ROAS to set ad targets?
Treat it as the line below which you should not operate, then set your actual target ROAS above it with enough headroom to cover fixed costs and leave profit. Many operators run campaigns at a target ROAS comfortably above break-even for reliable profit, while occasionally letting specific campaigns dip toward break-even when the goal is acquiring customers whose repeat purchases justify a thin first sale. Knowing your break-even figure is what lets you make that trade deliberately rather than by accident.
Why does break-even ROAS change over time?
Because it is driven by your contribution margin, and that margin moves. Rising product or shipping costs, higher payment or marketplace fees, or a price cut all compress your margin and push break-even ROAS up, meaning each ad dollar must now work harder just to break even. This is why it is worth recalculating break-even ROAS whenever your costs or prices change, rather than setting an ad target once and assuming it stays valid.
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Disclaimer. This calculator provides estimates for informational purposes only. Results are based on the information you enter and the assumptions used by the calculator. Actual financial, tax, business valuation, lending, marketplace or investment outcomes may differ. Consider consulting a qualified professional for decisions involving significant amounts of money. Results are estimates based on the costs entered. Break-even ROAS covers variable costs but not necessarily fixed overhead.