Break-Even ROAS Calculator
"Aim for 3x ROAS" is folklore. Your break-even ROAS is set by your margin, not by an industry number — and the difference between the two decides whether your ads make money or quietly drain it.
| Line item | Per order |
|---|---|
| Average order value | — |
| Product cost | — |
| Shipping you pay | — |
| Payment / channel fee | — |
| Gross profit before ads | — |
| Contribution margin | — |
| Ad spend per order at your ROAS | — |
| Net profit per order | — |
| Ad ceiling | Value |
|---|---|
| Maximum CPA (break-even) | — |
| Max CPA for your target margin | — |
| Your headroom per order | — |
Why "3x ROAS" is not a target
Break-even ROAS is one division: price ÷ gross profit per order. The gross profit here is after product cost, shipping and payment fees, but before advertising. That single number tells you the ROAS at which advertising stops paying for itself.
Because it is a ratio of price to profit, it moves with margin — and margin varies wildly between products:
| Contribution margin | Break-even ROAS | What 3x ROAS does |
|---|---|---|
| 25% | 4.00x | Net margin −8.3% |
| 30% | 3.33x | Net margin −3.3% |
| 35% | 2.86x | Net margin +1.7% |
| 40% | 2.50x | Net margin +6.7% |
| 50% | 2.00x | Net margin +16.7% |
| 60% | 1.67x | Net margin +26.7% |
The same 3x ROAS is a loss at 25% margin and a healthy 27% net margin at 60%. Anyone quoting a universal ROAS target is quoting their own margin structure, not yours.
The number to actually manage: maximum CPA
ROAS is a ratio, which makes it hard to reason about at the margin. Maximum CPA is the same information expressed as money, and it is far more useful for decisions: maximum CPA = gross profit per order before ads.
If an order yields $22.39 of gross profit, then $22.39 is the most you can pay to acquire it. A $15 CPA returns $7.40 per order; a $25 CPA loses $2.60 per order. When someone asks whether a campaign can be scaled, the answer is a comparison between current CPA and maximum CPA — not a ROAS threshold.
This is also why raising prices is the fastest way to make ads profitable: a $5 price increase flows almost entirely to gross profit, which raises maximum CPA by $4.86 after the percentage fee. That is a 20%+ increase in what you can pay per acquisition, without touching the ad account.
Platform ROAS always flatters you
Three things inflate the ROAS you see in an ad dashboard:
Attribution windows. A 7-day-click, 1-day-view window credits the platform for purchases that would have happened anyway. The default window is usually longer than the honest one.
Overlapping claims. Meta and Google both report the same order. Summed, platform revenue can exceed actual revenue — which is impossible, and yet it is what the dashboards show.
Excluding organic. A returning customer who buys without clicking an ad counts as platform revenue if they saw an ad earlier. The blended number, total revenue ÷ total ad spend, is always the truthful one.
Use platform ROAS to compare creatives and audiences inside one channel. Use blended ROAS — sometimes called MER — to decide whether advertising as a whole is profitable. This calculator is about the second one.
Frequently asked questions
Should I include fixed costs like subscriptions in the margin?
Not in break-even ROAS. Break-even ROAS is about whether the marginal order pays for its own acquisition, so it correctly excludes fixed monthly costs. Fixed costs belong in a separate check: whether total contribution covers subscriptions and overhead. Including them here would make every campaign look unprofitable at low volume.
What if my break-even ROAS is higher than any ROAS I can achieve?
Then the product cannot be profitably advertised at this price. Three fixes, in order of leverage: raise the price, cut the product cost, or accept that this item is an organic-only product and advertise a different one. Discounting makes the ratio worse, never better.
Does this account for returns and refunds?
Not directly. If your return rate is meaningful, either subtract the expected refund cost from gross profit per order before entering it, or enter a lower average order value that reflects net revenue after refunds. A 10% return rate on physical goods is common enough that ignoring it flatters the result.
How does this differ from a target ROAS bid strategy?
Google and Meta let you set a target ROAS, but they optimise toward attributed revenue, not your profit. Setting a platform tROAS below your true break-even is a reliable way to lose money efficiently. Compute break-even here first, then set the platform target above it.
Last reviewed: October 2026. Uses revenue-based ROAS, which is what ad platforms report. Excludes fixed monthly costs, taxes, refunds and currency conversion — see the FAQ for how to allow for refunds.