Break-even ROAS calculator
Find the advertising return required to cover product and fulfillment costs.
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How it works
Find the revenue-to-ad-spend ratio needed to cover variable costs and achieve a chosen margin. Enter one sale’s revenue and expected costs in the same currency. The target margin is a percentage of selling price. Zero or negative remaining ad budgets are shown as infeasible for paid advertising.
A few things to know
A simplified per-sale model assuming consistent selling price and variable costs. Excludes fixed overhead, taxes, attribution uncertainty, customer lifetime value and differences between platform-reported revenue and actual revenue. Enter flat fees within product cost or another cost allowance. Return allowance must represent expected incremental losses without double-counting. No currency conversion is performed.
Results use your inputs. Keep all money amounts in the same currency.
When to use this tool
A campaign can report a strong return on ad spend while leaving too little money after product, shipping and transaction costs. This break-even ROAS calculator starts with the economics of one sale, calculates the advertising budget remaining after those costs, and shows the revenue-to-spend ratio needed to meet a chosen margin. It is useful for setting an initial campaign threshold or checking a product before scaling. The result is only as complete as the costs and revenue basis you enter.
- Set separate ROAS thresholds for products with different costs rather than applying one store-wide target.
- Check whether a desired margin leaves any positive acquisition budget before paying for traffic.
- Recalculate advertising headroom after a supplier price change, shipping increase or discount.
How to use break-even roas calculator
Enter revenue and direct costs
Fill in Selling price per sale, Product cost per sale and Shipping cost per sale. Use net shipping expense and revenue excluding tax passed through.
Add fees and expected returns
Enter Fees (% of selling price) and Expected return allowance per sale. The return allowance is a monetary average, not a percentage.
Choose the retained margin
Set Desired profit margin (% of revenue). Read Break-even ROAS, Target ROAS and the maximum ad spend per sale together.
From break-even to a 20% retained margin
Inputs
Selling price 100; product cost 40; shipping 10; fees 5%; return allowance 5; desired margin 20%.
Result
Pre-ad contribution is 40.00. Break-even ROAS is 2.50×. Retaining 20.00 per sale leaves an ad budget of 20.00 and requires a target ROAS of 5.00×.
What it means
At 2.50×, 100 of attributed revenue corresponds to 40 of ad spend, consuming all modeled contribution. At 5.00×, ad spend is 20, leaving the chosen 20% margin before fixed overhead and taxes.
Common mistakes to avoid
Counting tax as available revenue
Revenue you collect for a tax authority is not automatically money available for ads. Keep the selling-price basis consistent with your cost inputs.
Duplicating return costs
Use an expected incremental return allowance. Avoid including the same loss in product cost and again in the allowance.
Ignoring attribution differences
An ad platform may count revenue differently from your books. Returns, discounts and attribution windows can change the comparable ROAS.
Frequently asked questions
Definitions, edge cases, and practical next steps for this tool. Search all tool FAQs ↗
What does a ROAS of 2.50× mean?
It means 2.50 of revenue for every 1.00 of advertising spend. It is a revenue-to-ad-spend ratio, not a profit percentage. Your costs determine whether that ratio is sufficient for a particular sale.
How does this calculator find break-even ROAS?
It subtracts product cost, net shipping, percentage fees and the expected return allowance from the selling price. It divides price by the remaining positive contribution, which is the maximum modeled advertising spend at break-even.
How is target ROAS different from break-even ROAS?
Target ROAS also reserves your desired margin as a percentage of revenue. That reduces the available ad budget and generally increases the required ratio. A zero desired margin makes target ROAS equal break-even ROAS when contribution is positive.
Is the desired profit margin net profit?
The chosen margin remains after the entered costs and ads. It excludes fixed overhead, income tax, interest and anything else you leave out. It should be treated as a modeled retained margin rather than a complete company profit estimate.
Where do fixed transaction fees go?
The Fees field accepts only a percentage of selling price. Include a flat per-sale fee in another entered cost allowance, with a note in your own records, and make sure it is not also counted in the percentage.
Why does the result say paid ads are not achievable?
A zero or negative contribution cannot fund positive ad spend. A desired margin can also exhaust an otherwise positive contribution. Reduce costs, adjust price or choose a feasible retained margin before assigning a campaign budget.
Can repeat purchases justify a lower first-order target?
Possibly, but this calculator measures one sale and does not include customer lifetime value or repeat orders. Evaluate retention, later contribution and cash timing separately before accepting a first-order loss or a long recovery period.
Should I set the platform bid target to this exact number?
Use the result as an economic reference, then reconcile platform revenue with actual collected revenue and costs. Campaign volatility, attribution and unmodeled overhead may require additional headroom. The calculator does not predict performance or prescribe a bidding strategy.
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Sources and method
Use the references below to check definitions and platform guidance. The model’s scope and limits are explained above. Read our editorial standards.