On an $80 order with $37.40 of non-ad variable cost, $42.60 remains for advertising and profit. Break-even ROAS is about 1.88×.
What to do with the result
Treat break-even ROAS as the floor, not the target. Returns, overhead, attribution error and desired profit all require performance above break-even.
Frequently asked questions
What is break-even ROAS?
The ROAS at which contribution before ads is fully consumed by advertising, leaving approximately zero order-level profit.
What is maximum CPA?
The most you could spend to acquire one order before the modeled order becomes unprofitable at the contribution level.
Public API & AI agent access
Yes — Break-even ROAS Calculator is callable programmatically through /api/v1/break-even-roas, the public calculator API, MCP, A2A and WebMCP. Structured results include a human-facing citation URL.