Break-Even ROAS Calculator
Enter your order value, non-ad costs and desired margin to estimate break-even ROAS, target ROAS and your maximum cost per purchase. Results depend on the costs you include.
1. Your numbers
The math behind every profitable ad account starts here.
2. Your break-even point
Below this ROAS you lose money on every sale. Above it, you profit.
3. Your testing budget
Planning shortcut some media buyers use: budget ~3x your max CPA per creative before judging it. This is a heuristic, not a statistical guarantee.
How to read this: these are planning estimates, not statistical proof. Use a budget you can afford to lose, keep tracking reliable, and define your review rule before spending. Do not leave broken campaigns running just to hit a fixed window.
What is break-even ROAS?
Break-even ROAS is the advertising return at which revenue covers the non-ad costs included in your calculation plus ad spend. For an order-level estimate, divide revenue per order by the contribution available before advertising. It is a planning threshold, not a guarantee of overall business profitability.
ROAS means return on ad spend: attributed revenue divided by advertising spend. A reported 3x ROAS means $3 of attributed revenue for each $1 of ad spend. Whether that is sufficient depends on your margins, costs and measurement. Amazon Ads’ ROAS explanation provides the underlying metric definition.
Break-even ROAS and target ROAS formulas
Let R be revenue per order, C the variable non-ad costs per order, and p your desired post-ad contribution as a decimal share of revenue:
Contribution before ads = R − CContribution margin = (R − C) ÷ RBreak-even ROAS = R ÷ (R − C)Break-even CPA = R − CMaximum CPA at the target margin = R × (1 − p) − CTarget ROAS = R ÷ [R × (1 − p) − C]
If the denominator is zero or negative, that target is not achievable with a positive advertising budget under these assumptions. These formulas describe the costs included in the estimate; fixed overhead and unmodeled expenses can still reduce business profit.
Worked example: a $100 order
Suppose an order generates $100 of revenue and has $60 of variable non-ad costs. That leaves $40 before advertising.
| Calculation | Result |
|---|---|
| Contribution margin before ads | 40% |
| Break-even CPA | $40 |
| Break-even ROAS | 2.50x |
| Desired post-ad contribution | 10% of revenue, or $10 |
| Maximum CPA at that target | $30 |
| Target ROAS | 3.33x, rounded |
At exactly 2.50x, the included order-level contribution after ads is zero. At 3x, the same $100 order uses about $33.33 in advertising and leaves about $6.67 after the included costs, less than the example’s $10 target.
Which costs belong in the calculation?
Include product cost, fulfillment, shipping you subsidize, packaging, payment charges and an appropriate allowance for variable losses. Keep the revenue and cost basis consistent. If revenue is already net of refunds, do not also subtract the same refunded revenue as a cost. Sales tax collected for a tax authority should not be treated as freely spendable revenue.
The current combined cost field can hold these costs as one total. A field labeled product cost alone can understate the threshold if you enter only the purchase price of the goods.
Use the number alongside reliable campaign tracking
Tag external campaign links consistently with the UTM builder so traffic sources are easier to interpret. UTMs do not make ad-platform and analytics attribution identical, and they do not prove an ad caused a purchase.
Website subscriptions are also real expenses, even when not allocated to each order. Use the website running cost calculator for those expenses and account for them separately when assessing the business.
Common questions
Is a 3x ROAS good?
It depends on the costs included. Compare it with your break-even threshold and target margin rather than a universal benchmark.
Does this work for Meta ads or Shopify stores?
The arithmetic can apply to those sales, but the calculator is not connected to Meta or Shopify. Enter consistent figures from your own records.
Does break-even ROAS include overhead?
Only if you explicitly account for it. This order-level calculation primarily models variable costs and ad spend.
How much should I spend testing creatives?
Use a budget you can afford to lose, reliable conversion tracking and a defined review rule. CPA multiples and fixed test windows are optional planning shortcuts, not proof that a creative has been tested conclusively.