Break-Even ROAS Calculator | Free Ecommerce Ad Spend Tool
A break-even ROAS is the line between profitable and unprofitable advertising. It is calculated from your own contribution margin, not from a generic industry benchmark.
If the contribution margin is 40%, break-even ROAS is 1 ÷ 0.40 = 2.5×. Your target should be higher when the business needs a profit buffer.
How this free tool works
Calculate break-even ROAS and CPA for ecommerce campaigns using product cost, shipping, fees and ad spend. Free, instant and no signup. The result is designed to be transparent: you can see the inputs, the formula and the assumptions instead of receiving a black-box score.
Contribution margin = (revenue − variable costs) ÷ revenue. Break-even ROAS = 1 ÷ contribution margin. Target ROAS = 1 ÷ (contribution margin − target profit margin).
Best for
- Ecommerce operators scaling paid traffic
- Media buyers who need a defensible target ROAS
- Founders checking whether a reported ROAS is actually profitable
Frequently asked questions
What is break-even ROAS?+
It is the minimum revenue-to-ad-spend ratio at which contribution profit covers ad spend. Below it, the campaign loses money before fixed overhead.
Is break-even ROAS the same as target ROAS?+
No. Break-even is zero profit. Target ROAS should be higher if you want to keep a specific profit margin.
Why is my break-even ROAS so high?+
Thin margins, high shipping or payment fees, returns and low average order value all increase the ROAS required to break even.
References and methodology
We use primary documentation where available and treat calculators as planning aids, not guarantees. Check the linked source when a platform changes its rules.
- Google Ads: About return on ad spend
Official ROAS context from Google Ads.
- Amazon Ads: Return on ad spend
A platform-level explanation of ROAS and ad efficiency.
Turn this answer into a repeatable growth workflow.
Use the free result as your starting point, then move the next campaign, creative or growth decision into GrowthGPT when the work becomes repetitive.