Advertising · Any platform
Break-even ROAS: what your order can spend on ads
Work through a $100 order with $60 in variable costs. Calculate a 2.5 break-even ROAS, maximum ad cost and the effect of fixed overhead.
Calculate contribution before you judge an ad return
Return on ad spend compares reported revenue with advertising spend. A high number can still leave little profit if product, shipping and fees consume most of the order. Start with the dollars available for ads after non-ad variable costs.
Use revenue excluding buyer tax and after discounts. Include charged shipping if it is part of your revenue, and include the actual expense of shipping among costs. Enter product, packaging, fulfillment, payment and platform costs once. Ads belong in the ad-spend field, outside the non-ad total.
Pre-ad contribution = revenue − non-ad variable costs
Break-even ROAS = revenue ÷ positive pre-ad contribution
Maximum ad cost per order = positive pre-ad contribution
Fixed recurring overhead is shown separately. This makes the primary threshold useful for variable order economics while also allowing a second check that covers an entered overhead allocation.
A $100 order with $60 of non-ad costs
The example has $100 revenue, $40 product cost, $5 shipping and $15 platform/payment fees. Packaging and other non-ad variable costs are $0. The $60 total leaves $40.00 before ads: a 40% contribution margin.
Variable-cost break-even: $100 ÷ $40 = 2.50×
Max ad cost for variable break-even: $40.00 per order
At $20 ad spend, entered ROAS: $100 ÷ $20 = 5.00×
Profit after ads: $40 − $20 = $20.00
| Ad spend per order | ROAS | After variable costs and ads |
|---|---|---|
| $20.00 | 5.00× | $20.00 |
| $40.00 | 2.50× | $0.00 |
| $50.00 | 2.00× | −$10.00 |
The 2.5× threshold covers the $60 variable cost and $40 of ads. It leaves nothing for fixed overhead or profit. A campaign target should reflect the amount you need beyond break-even, not merely match that threshold.
A second threshold can include fixed overhead
Allocate $5 fixed overhead to the same order. Contribution available for ads after that allocation is $35. The corresponding ROAS is $100 ÷ $35 = about 2.86×. With the example's $20 ad spend, profit after ads and the entered overhead is $15.00.
The primary variable-cost target remains 2.5×. Both numbers can be useful, but they answer different questions. Changing an overhead allocation is not the same as changing fulfillment costs or the cash cost of acquiring an extra order.
Include a realistic expected returns cost in non-ad variable costs when relevant. A full refund model, inventory loss, customer lifetime value and future purchases are not automatically calculated. An acquisition price justified by repeat purchases needs separate evidence about those purchases.
Compare consistent revenue and attribution
An ad report might include tax, shipping or overlapping attribution claims differently from your store records. If the report's revenue base is larger than the revenue used here, the ROAS values are not directly comparable. Reconcile the basis before changing a campaign budget.
Entered ROAS is unavailable when ad spend is zero; zero spend does not establish an infinite measurable advertising return. With zero or negative pre-ad contribution, there is no finite positive break-even ROAS. Improving ad efficiency cannot pay for a loss that exists before any ads.
Use the matching platform calculator to estimate fees, then enter the resulting non-ad costs here. Do not add the same fee twice. Review actual orders and returns to replace example inputs with your own cost evidence.
Sources and scope
Sources and formulas checked 2026-10-04. These are hypothetical examples and estimates using the entered costs, not invoices, typical margins or forecasts of sales or income. The site is independent of Amazon, Shopify, eBay and Etsy. Review your account terms for adjustments that apply to you.
Full scope, formulas and limits · Break-even ROAS · More seller guides.