Attribution & Measurement
How to calculate your maximum profitable CPA
Your maximum profitable CPA is not the number at which the campaign "looks good." It is the acquisition cost at which the order still meets the profit requirement you have chosen.
Start with contribution before advertising
Example:
- Selling price: $120
- Product cost: $50
- Fulfilment/payment/shipping subsidy: $15
- Expected refunds/variable cost: $5
Contribution before advertising = $50.
If you are willing to break even on the first order, $50 is the maximum first-order CPA.
Add a profit requirement
If you want to retain $15 contribution per first order: $50 - $15 = $35 target maximum CPA.
Include customer lifetime value carefully
If new customers reliably generate future contribution, you may accept a higher first-order CPA. Use actual cohort data and a defined payback period, not optimistic lifetime revenue.
Segment by product
A single account CPA target can be misleading when products have different margins. Calculate allowable CPA by meaningful product groups.
The maximum is an economic boundary. Your campaign target should normally leave enough safety for volatility and overhead.
Build your acquisition ceiling from real economics
If your Meta or Google CPA target was chosen without a margin calculation, send us an inquiry. We can build the acquisition ceiling from your actual Shopify economics.