The short answer
The average order value required for a ROAS goal equals the target multiple times cost per order. This is useful when assessing a bundle or cross-sell idea, but the larger basket must also support its extra product and fulfillment costs.
Calculate the required order value
Assumes unchanged CPA. Extra basket costs must be evaluated separately. Inputs stay in your browser. Displayed results are rounded.
Use the order-based formula
Equivalent click model = target ROAS × CPC ÷ orders per click
Both versions require the same order and attribution population. Do not use a lead CPA or new-customer CAC as though it were cost per attributed order.
Calculate the basket requirement
Illustrative inputs: CPA per order $25 and target ROAS 4×. Required AOV is 4 × $25 = $100. If observed AOV is $80, the gap is $20, or $20 ÷ $80 × 100% = 25%. This is the increase needed under unchanged CPA, not an expected result of adding a product recommendation.
Check contribution rather than revenue alone
Assume the $80 basket has $40 in non-ad variable costs. After a $25 CPA it leaves $80 − $40 − $25 = $15. A proposed $100 basket with $65 in costs leaves $100 − $65 − $25 = $10. The proposal reaches the ROAS goal while reducing contribution per order by $5.
Model the conversion response
If a higher minimum order value reduces completed orders from the same paid traffic, CPA can rise. At an illustrative $30 CPA, the $100 basket delivers $100 ÷ $30 ≈ 3.33×, not 4×. The required AOV would rise again to 4 × $30 = $120. Price, order rate, and acquisition cost cannot safely be assumed independent.
Use a bounded offer test
Track orders, AOV, discount usage, non-ad costs, returns, and contribution after ads. Compare the whole period’s contribution as well as per-order figures. Keep stock availability and traffic mix visible so an apparent basket effect is not confused with a different customer mix.
If the required AOV is far above observed baskets, consider whether the ROAS goal or acquisition cost is the more appropriate assumption to revisit. A rearranged equation identifies a requirement; it does not create customer demand.
Check the required basket
- Gather: Use cost per completed order and a ROAS target on the same revenue basis.
- Produce: Recalculate the required AOV if a higher basket changes conversion rate or CPA.
Decision boundary: Do not replace order CPA with lead CPA or new-customer CAC.
Next reading
Examples are illustrative, not client results or benchmarks. The calculations use the inputs shown; real-world decisions depend on your records and assumptions. Report a correction.