ROAS — return on ad spend — is the fastest health check in advertising: revenue divided by ad spend. This ROAS calculator reports it both ways the industry quotes it, as a multiplier (5×) and as a percentage (500%), and then does the part most calculators skip: from your gross margin it derives your break-even ROAS, the exact value below which your ads are returning less money than the goods they sell cost you. A ROAS means nothing until it is standing next to that line.
The formula, and the break-even nobody quotes
ROAS = revenue ÷ ad spend. Break-even ROAS = 1 ÷ gross margin. The second formula follows from arithmetic, not opinion: if your margin is 40%, each sale keeps 40 cents of gross profit per revenue unit, so your ads must return at least 1 ÷ 0.40 = 2.5× before the gross profit covers the spend. At a 25% margin the line rises to 4×; at a 10% margin, to 10× — which is why thin-margin businesses cannot make paid ads work at ROAS figures that would delight a high-margin brand, and why copying a competitor’s “good ROAS” target without their margin is a plan to lose money at scale.
Worked example
Spend 1,000, revenue 5,000: ROAS = 5,000 ÷ 1,000 = 5×, quoted as 500%. With a 40% gross margin, break-even is 2.5× — this campaign sits comfortably above its line, returning twice the revenue its margin requires. Now change only the margin: at 20%, break-even is 5×, and the identical campaign is exactly at the waterline — every return, fee and discount comes straight out of the business. Same ads, same ROAS, opposite verdicts. That is the whole argument for calculating the break-even next to the ROAS every single time.
How ROAS gets flattered
Three habits inflate ROAS without moving money. Attribution windows: platforms claim conversions for days after a click, so two platforms routinely claim the same order. View-through credit: some reports count people who merely saw an ad. And gross revenue: ROAS is computed before refunds, cancellations and discounts settle, so a campaign measured on day one always looks better than the same campaign measured on day thirty. Feed this calculator the settled revenue from your store, on one consistent window, and compare campaigns on that basis only. If you want the fuller picture — profit after the spend and after product costs — that is ROI, and the marketing ROI calculator on this site computes both.
Which revenue figure belongs in the formula
Use the revenue from your store or analytics platform, settled after refunds, on the same attribution window every time. Platform-reported revenue is a claim, not a measurement: two platforms can each take credit for the same order, and both will. If your store says the campaign drove 4,200 while the platform claims 5,000, the honest ROAS uses 4,200 — the lower number is the one your bank account will eventually vote for.
ROAS — frequently asked questions
Is ROAS the same as ROI? No. ROAS divides revenue by spend and stops; ROI subtracts the spend (and, in its true form, product costs) before dividing. A 5× ROAS is a 400% headline ROI before product costs — related, but not interchangeable.
What is a good ROAS? One comfortably above your break-even. Compute your line from your margin with this tool; a target imported from another business with another margin is meaningless.
Why does my break-even use gross margin, not net? Because the ad spend is what the gross profit must cover first. Overheads come after; if the campaign cannot clear its own spend out of gross profit, no overhead allocation will rescue it.
My ROAS is below break-even but revenue is growing. Scale anyway? Only as a deliberate, time-boxed loss with a reason — entering a market, building a retargeting pool — and a date to re-check. Growth that loses more money per order as it scales is not an investment by default.
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Versión en español: Calculadora de ROAS: Retorno de tu Inversión Publicitaria en Veces y Porcentaje, con tu Punto de Equilibrio · Marketing ROI Calculator · CPC Calculator.
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