What ROAS measures
Return on ad spend (ROAS) is attributed sales revenue divided by advertising spend. A 3.0x ROAS means the campaign generated three dollars of attributed revenue for each dollar spent. It does not mean the campaign generated profit.
Estimate your break-even ROAS
First calculate the share of revenue available to pay for advertising after product costs, fulfilment, marketplace fees, payment processing and other variable costs. If 30% of sales revenue remains before advertising, the simple break-even ROAS is approximately 1 ÷ 0.30 = 3.33x.
This simplified model assumes the costs are proportional or consistently allocated to revenue. Include fixed per-order costs by converting them into a percentage at the expected selling price.
Set a target above break-even
Break-even is not a growth target. Your actual target should leave room for overhead, refunds, attribution gaps and profit. Review results by product, campaign and time period; platform attribution can differ from your financial records.
Common mistakes
- Using gross sales instead of net sales after discounts and refunds
- Ignoring marketplace fees, shipping subsidies or returns
- Comparing campaigns with different attribution windows
- Scaling on a short period with too little conversion data
Check how sensitive break-even ROAS is to your costs
The break-even point changes when variable costs change. If $60 of net sales leaves 40% before advertising, break-even ROAS is 2.50x. If higher fulfilment, returns or marketplace costs reduce that share to 30%, break-even rises to 3.33x. If only 20% remains, it rises to 5.00x. This is why one store-wide ROAS target can be misleading when products have different margins.
Recalculate by SKU or product group when shipping weight, discounts, return rates or platform fees differ. Use a conservative contribution rate when costs are uncertain, and review the calculation after actual refunds and settled fees are available.
Use the profit calculator to model per-order costs before deciding what advertising spend is sustainable.Worked example: from contribution to a ROAS target
Assume an order generates $60 in net sales before advertising. Product, fulfilment, marketplace, payment and other variable costs total $39, leaving $21 before advertising. The pre-ad contribution rate is 35% ($21 ÷ $60). The simplified break-even ROAS is 1 ÷ 0.35, or about 2.86x.
If you want to retain a further 10% of net sales as contribution after advertising, only 25% of sales is available for ads. The corresponding ROAS target is 1 ÷ 0.25 = 4.0x. This target still does not automatically cover fixed overhead unless that is included in your target margin.
Translate ROAS into an allowable cost per order
At $60 net sales and a 25% allowable ad share, the advertising cost per order would be $15. Compare this amount with actual campaign spend and attributed orders, while checking attribution windows, cancellations and refunds. Platform-reported ROAS is a campaign metric, not a substitute for settled financial results.