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Break-Even ROAS Calculator

Find the ROAS your ads must hit to break even, the target ROAS for a profit goal, your maximum CPA, and convert between ROAS and ACoS for Amazon Ads.

Unit economics of one order

Variable cost per order: $42.32 · contribution: $37.68 · contribution margin: 47.1%. Fixed overheads such as rent and salaries stay out of this — they do not change with one more sale.

2.12×
Break-even ROAS = 1 ÷ contribution margin
$37.68
Break-even CPA
47.1%
Break-even ACoS
47.1%
Contribution margin
$37.68
Contribution per order

Target a profit margin

Target ROAS
2.70×
Maximum CPA at that ROAS
$29.68

Target ROAS = 1 ÷ (contribution margin − target margin). Both are fractions of revenue, so the target can never reach the contribution margin.

Profit at a spend and ROAS

Revenue
$15,000.00
Orders
188
Profit after ad spend
$2,065.00
Net margin on that revenue
13.8%

At the ROAS in the scenario box you are above break-even and every extra order adds profit.

ROAS ↔ ACoS converter

= ACoS 25.00%
= ROAS 4.00×

ACoS is advertising cost of sale — the same relationship inverted, so ACoS = 1 ÷ ROAS. A 4× ROAS is a 25% ACoS. Amazon sellers usually quote ACoS; everyone else usually quotes ROAS.

This is a contribution-margin model: it answers "does one more ad-driven order pay for itself?". It deliberately ignores fixed overheads and repeat purchases, so a business with strong lifetime value can profitably run below the break-even ROAS shown here. Every figure is computed in your browser from the numbers you enter.

What is the Break-Even ROAS Calculator?

A break-even ROAS calculator that derives contribution margin from your unit economics, then reports break-even ROAS as 1 ÷ contribution margin, break-even CPA as the contribution per order, the target ROAS for a stated profit margin, and the equivalent ACoS.

  • Contribution margin built from cost of goods, shipping, payment fees and other variable costs
  • Break-even ROAS, break-even CPA and break-even ACoS from one set of inputs
  • Target ROAS for any stated net profit margin, with an honest warning when the target is unreachable
  • Profit-or-loss scenario at any spend and ROAS pair
  • Two-way ROAS ↔ ACoS converter for Amazon Ads users
  • A negative contribution margin says so plainly instead of printing a nonsense ratio

How to use the Break-Even ROAS Calculator

  1. 1

    Enter your average order value, then the cost of goods, shipping and fulfilment, payment processing percentage and any other variable cost per order.

  2. 2

    Read the break-even ROAS headline and the supporting stats — break-even CPA, break-even ACoS and contribution margin.

  3. 3

    Set a target net profit margin to see the ROAS required to achieve it and the maximum CPA that implies.

  4. 4

    Enter an ad spend and an achieved ROAS in the scenario box to see revenue, orders, profit and net margin at that combination.

  5. 5

    Use the converter at the bottom to move between ROAS and ACoS in either direction.

About the Break-Even ROAS Calculator

Break-even ROAS is the single number that tells you whether an ad campaign is buying growth or buying losses, and it falls straight out of your contribution margin: at a 40% margin you need 2.5× revenue for every unit of spend just to stand still. This calculator builds that margin from real inputs — cost of goods, shipping, payment fees and any other per-order cost — instead of asking you to guess it.

From there it answers the three questions that follow. What ROAS do I need for a 10% profit margin? What is the most I can pay for one order? And what does all of this look like in ACoS, the inverted metric Amazon sellers work in? There is also a scenario box that prices out the profit or loss at any spend and ROAS pair.

This is a contribution-margin model, so it deliberately ignores fixed overheads and repeat purchases — a business with strong lifetime value can profitably run below the break-even shown here. Everything is computed in your browser from the figures you enter.

Frequently asked questions

How do you calculate break-even ROAS?

Break-even ROAS is 1 divided by your contribution margin expressed as a fraction. A 40% contribution margin gives a break-even ROAS of 2.5, meaning every dollar of ad spend must return two dollars fifty in revenue before the campaign contributes anything.

What is the difference between ROAS and ACoS?

They are the same relationship inverted. ACoS is ad spend divided by revenue, ROAS is revenue divided by ad spend, so ACoS = 1 ÷ ROAS. A 4× ROAS is a 25% ACoS. Amazon sellers usually quote ACoS and everyone else quotes ROAS.

Should I use gross margin or contribution margin for break-even ROAS?

Contribution margin, because it also removes shipping, payment fees and any other cost that scales with each order. Using gross margin alone flatters the result and produces a break-even ROAS you cannot actually hit.

Why can't I hit my target profit margin at any ROAS?

Because the target margin has to come out of the contribution margin. If you want a 40% net margin on a product with a 35% contribution margin, ads would have to be free and then some. The tool flags that case rather than printing an impossible number.

Can I profitably run below break-even ROAS?

Yes, if customers buy again. This model prices a single order, so a subscription or high-repeat business can rationally accept a first-order loss it expects to recover later. Compare against lifetime value, not against this figure alone, when that applies.

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