Break-even ROAS is a useful boundary, not a promise. Start with gross margin, then add the costs and conversion assumptions that matter to your model.
Start with contribution margin
A simplified break-even ROAS is 1 divided by contribution margin. If the margin is 50%, the boundary is 2.00x before overhead, refunds and other costs.
Add the costs that the platform hides
Include fulfilment, sales effort, discounts, agency or tooling costs and the difference between booked and collected revenue where they materially change the decision.
Use scenarios, not one magic number
Model conservative, expected and upside assumptions for conversion rate, average order value and margin. The useful output is a range and a decision rule.
Turn the model into an action
Decide what must be true before adding budget, what evidence would change the assumption and who owns the next review.
Sources & further reading
This framework is Samsina’s practical interpretation. The following primary sources provide useful platform or governance context.
Google Ads Help — ROAS and conversion valueOfficial guidance on value-based measurement.↗Author: Sina Dadmehr, founder of Samsina and specialist in performance marketing and demand generation. Reviewed 10 August 2026.
