The Break-Even ROAS Calculator
Every ads decision starts here. Put your real unit economics in and find out the exact ROAS below which you are paying for the privilege of shipping orders.
Most brands set an ROAS target by feel, or copy one from a podcast. Your break-even ROAS is not a matter of opinion — it falls out of your margins, and it is different for every product you sell.
Use the blended average across the products you actually advertise, not your hero SKU. Returns belong in “other variable” — if 8% of orders come back, add 8% of your unit cost.
How the maths works
Break-even ROAS is just the inverse of your contribution margin. If every $68 order leaves you $38 after product, shipping and fees, that is a 56% margin — so you break even at a ROAS of 1 ÷ 0.56, or about 1.79. Spend a dollar, get $1.79 back, and you have made exactly nothing.
That single number reframes almost every conversation about paid media. A 2.4 ROAS sounds mediocre until you know break-even is 1.79, at which point it is a 34% margin on new customer revenue. A 3.0 ROAS sounds strong until you learn the brand ships free, takes 12% returns and breaks even at 2.8.
Founders compare their ROAS to other brands' ROAS. It is a meaningless comparison — a supplement brand at 70% margin and an apparel brand at 40% margin are playing completely different games. The only benchmark that matters is your own break-even line.
Three things this calculator does not include
- Repeat revenue. If a meaningful share of first-time buyers come back, you can afford to acquire below break-even on order one. That is a deliberate decision, not an accident — and it requires knowing your repeat rate, not hoping for one.
- Fixed costs. Salaries, software, rent and your agency retainer sit below the contribution line. Contribution margin pays for them; it is not profit.
- Attribution error. Platform-reported ROAS overstates. This calculator gives you the true line; compare it against blended ROAS — total revenue divided by total ad spend — not what Meta reports.
How to use the number
| If blended ROAS is | What it means | What to do |
|---|---|---|
| Below break-even | Every order loses money on first purchase | Stop scaling. Fix margin, offer or conversion rate first. |
| At break-even | You are buying customers at cost | Only defensible if repeat rate is proven and cash allows. |
| 1–1.3× break-even | Thin but real contribution | Scale carefully; watch that margin holds as spend rises. |
| Above 1.3× | Healthy headroom | Push spend until you approach the floor. You are leaving growth on the table. |
The free growth plan starts with exactly this calculation, using your real numbers rather than estimates — then works out what your current spend is actually returning against it.
Know Your Floor. Then Scale.
We will pull your unit economics apart on a free 30-minute call and tell you where your real ceiling on spend sits.