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Enter your ad revenue, spend, and profit margin to instantly see your ROAS, your break-even ROAS, ACOS, cost per conversion, and real ad profit — so you know whether every dollar you feed the platform comes back with a friend. No login, no spreadsheet, nothing saved.
ROAS, break-even ROAS, and ACOS all describe the same campaign from different angles. Read together, they tell you whether to scale, fix, or pause.
Return on ad spend = revenue ÷ ad spend. A 4x ROAS means every $1 spent brought back $4 in revenue. It's the headline number, but on its own it doesn't tell you if you made a profit — that depends on your margin.
1 ÷ profit margin. At a 40% margin you need 2.5x just to cover the cost of goods and the ad spend. Any ROAS above your break-even line is profit; anything below it is a loss, no matter how big the number looks.
Advertising cost of sale = spend ÷ revenue, the inverse of ROAS. A 4x ROAS is a 25% ACOS. Amazon and marketplace sellers usually target ACOS; you want it comfortably below your margin so the sale still nets a profit.
Return on ad spend (ROAS) is the simplest way to size up a paid campaign: divide the revenue your ads generated by what you spent to get it. Spend $3,000 and make $12,000 back, and your ROAS is 4.0x — often written as 400%. It answers one question: how many dollars of revenue did each advertising dollar produce?
The catch is that ROAS is a revenue ratio, not a profit ratio. A 4x ROAS looks great for a business running 50% margins and can be a disaster for one running 15% margins. Revenue that costs you 90 cents to produce isn't the same as revenue that costs you 40 cents. That's why ROAS should never be read on its own — it has to be compared against your break-even point.
Break-even ROAS is the ROAS you need just to avoid losing money, and it comes straight from your profit margin:
If your margin is 40%, every 2.5x of revenue exactly covers the cost of the product plus the ad spend. Clear 2.5x and you're profitable; fall under it and you're subsidizing sales. This is why two businesses can post the identical 3x ROAS and land in completely different places — the one at a 50% margin (break-even 2x) is printing money, while the one at a 25% margin (break-even 4x) is quietly losing on every order.
Because break-even ROAS is 1 ÷ margin, thin margins demand a much higher ROAS. A 20% margin needs 5x just to break even; a 60% margin only needs about 1.7x. That single relationship explains most "my ROAS is 3x but I'm not making money" confusion. Before you judge a campaign, calculate your break-even first — then aim for a ROAS meaningfully above it so there's real profit after the cost of goods, platform fees, and returns.
There's no universal good number — a good ROAS is simply one comfortably above your break-even ROAS with room left over for overhead and profit. As a rough, honest starting frame:
| Profit margin | Break-even ROAS | Healthy target ROAS |
|---|---|---|
| 20% (thin retail) | 5.0x | 6x+ |
| 30% | 3.3x | 4x+ |
| 40% (typical e-comm) | 2.5x | 3x+ |
| 50% | 2.0x | 2.5x+ |
| 70% (services / digital) | 1.4x | 2x+ |
Lead-gen businesses often can't measure revenue-per-click directly, so they track cost per conversion (CPA) against the value of a customer instead — a $50 CPA is a bargain when a closed job is worth $3,000. E-commerce and marketplace sellers lean on ROAS and ACOS. Whichever you use, the discipline is the same: know your margin, calculate your break-even, and only scale spend that clears it. Want the exact targets for your account? Pair this with our ROI calculator and CPC checker, or grab a free audit below.
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