See POAS vs revenue-only reporting
Profit Bid connects store costs to ad spend so you bid on margin — not vanity ROAS.
CPA vs profit-aware CPA ceiling
- Actual CPA
- Profit-based CPA cap
A flat CPA target leaves profit on the table when order margins rise. A profit-based cap flexes with margin.
Track POAS automatically from your store — upload profit conversions and scale winners with A/C/X labels.
CPA formula and bidding
Cost Per Acquisition divides spend by conversions. $1,000 spend and 40 orders is a $25 CPA. Target CPA bidding tells Google to hit an average CPA, adjusting bids in real time.
The flaw: a flat CPA cap treats a $200 high-margin order the same as a $40 thin-margin one, so you overpay for low-value conversions and underpay for great ones.
From CPA to profit per order
The right CPA ceiling is a share of the gross profit an order generates. A SKU earning $80 profit can justify a much higher CPA than one earning $12.
Profit Bid uploads profit-weighted conversion values so Smart Bidding effectively sets a per-order CPA that respects margin — the practical version of profit bidding.
Frequently asked questions
Common questions about this topic — tap to read answers.
What is the difference between CPA and CAC?
CPA is often per-order and ad-platform-scoped. CAC (Customer Acquisition Cost) is broader — total sales and marketing cost ÷ new customers.
Should I use Target CPA or Target ROAS?
tCPA suits lead-style or stable-value conversions; tROAS suits variable order values. For profit, feed profit values so either strategy optimizes margin.
