ShipMargin
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Break-even ROAS & Max CPA Calculator

Set advertising guardrails before launching or scaling a paid campaign.

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Decision inputs
Adjust the example values to match one product, order, shipment, or planning period.
Live result Deterministic
Decision summary
Calculated from the visible formula and assumptions on this page.

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How to use this tool

A decision, not just an output

Calculate break-even return on ad spend, maximum acquisition cost, and maximum CPC from contribution economics. Read the output alongside its interpretation, assumptions, limitations, and source. Marketplace rates and external requirements should always be confirmed at the linked official source.

Formula & example

Transparent method

Break-even ROAS = revenue ÷ pre-ad contribution; maximum CPA = pre-ad contribution; maximum CPC = CPA × conversion rate.

Example: A $100 sale with $50 pre-ad contribution breaks even at 2.0× ROAS and supports a $50 CPA.

Assumptions

  • • All non-ad variable costs are included.
  • • Conversion rate uses clicks as the denominator.

Limitations

  • • Lifetime value, repeat orders, attribution lag, and refunds are not modeled.

Frequently asked questions

Is the Break-even ROAS & Max CPA Calculator free?

Yes. The primary result is available without creating an account or entering an email address.

How is the result calculated?

Break-even ROAS = revenue ÷ pre-ad contribution; maximum CPA = pre-ad contribution; maximum CPC = CPA × conversion rate.

What should I verify before using it?

Lifetime value, repeat orders, attribution lag, and refunds are not modeled.

Are my inputs private?

Core inputs are processed in your browser. ShipMargin records anonymous tool interaction events, not the business values entered into this form.