Break-even ROAS is the return on ad spend at which a campaign makes exactly zero profit. Below it, every sale loses money; above it, you profit. The formula is simple:
At a 40% gross margin, break-even ROAS = 1 / 0.40 = 2.5. You need $2.50 in sales for every $1 of ads.
Why the formula works
If gross margin is m, each $1 of revenue leaves m dollars to pay for advertising. To break even, the gross profit from ad-driven sales must equal the ad spend: Revenue x m = Spend. Rearranged, Revenue / Spend = 1 / m. Revenue divided by spend is ROAS, so break-even ROAS = 1 / m.
Calculating gross margin correctly
Most break-even mistakes come from an optimistic margin. Include every cost that grows with each order:
| Cost per order | Example on a $80 order |
|---|---|
| Product cost (COGS) | $26.00 |
| Packaging | $1.50 |
| Shipping you pay | $7.00 |
| Payment processing (about 2.9% + $0.30) | $2.62 |
| Returns and refunds (expected) | $3.20 (4% of revenue) |
| App or platform fees per order | $0.68 |
| Total variable cost | $41.00 |
Gross margin = ($80 - $41) / $80 = 48.75%. Break-even ROAS = 1 / 0.4875 = 2.05x. Had this store used only product cost ($26), it would have calculated a 67.5% margin and a 1.48x break-even - and happily run campaigns that were losing money.
Three worked examples
| Business | AOV | Variable cost | Gross margin | Break-even ROAS |
|---|---|---|---|---|
| Supplements store | $55 | $16.50 | 70% | 1.43x |
| Furniture e-commerce | $420 | $273 | 35% | 2.86x |
| Phone accessories reseller | $25 | $20 | 20% | 5.0x |
From break-even ROAS to break-even CPA
Ad platforms often bid on cost per acquisition rather than ROAS. Convert with:
For the $80 store: $80 x 0.4875 = $39. Pay more than $39 per order and you lose money on the first purchase. The break-even CPA calculator also turns this into a max CPC using your conversion rate.
Adding a profit target
Break-even is the floor. To keep a profit margin p after ads, use:
The $80 store wanting 15% profit: 1 / (0.4875 - 0.15) = 2.96x. That is the number to put into a target ROAS bid strategy.
Break-even ROAS for repeat-purchase businesses
If customers come back, the first order does not need to break even on its own. A lifetime version uses gross profit across expected orders:
Use it carefully: it only works if repeat behaviour is proven in your data and you have the cash to wait for those later orders. Many brands use first-order break-even for prospecting budgets and lifetime break-even only as an upper limit.
Frequently asked questions
What is the break-even ROAS at 50% margin?
2.0x. You need $2 in revenue for every $1 of ad spend.
Should break-even ROAS include overheads like salaries?
No. Break-even ROAS covers variable costs and ad spend. Cover fixed overheads by setting a target ROAS above break-even.
Is break-even ROAS the same in every ad platform?
The math is the same, but platforms report revenue differently. Compare it against revenue you trust, ideally your own store data.