Target CPA is a Smart Bidding setting in Google Ads, also offered in similar forms on Microsoft Advertising, Meta and LinkedIn as a cost cap or cost goal. You give the platform an average cost per conversion you are willing to pay, and it adjusts bids auction by auction to hit that average. In Google Ads it now sits as an optional target inside the Maximize conversions strategy.
How it behaves
The target is an average, so some conversions will cost more and some less. Set it too low and the campaign may spend little and win few auctions; set it too high and it may spend freely on marginal traffic. The budget still caps total spend.
- Start near your recent actual CPA, not an aspirational number.
- Change it in small steps and wait for results before the next change.
- Make sure the conversion it targets is the one you value.
Choosing the number for SaaS
Work back from value. If you know what a customer is worth over a payback period and what share of a given conversion type becomes a customer, the affordable CPA for that conversion follows. Use separate targets, or separate campaigns, when conversion types have very different values.
Affordable CPA = Value of a customer x Conversion-to-customer rate
Example: $6,000 x 0.10 = $600 per demo (illustrative)Example
From manual to target CPA
Hypothetical company Briarcrest has run manual bids for months and has a steady demo CPA. It moves to Maximize conversions with a target CPA set at that recent average, holds it for several weeks, then lowers it slightly and checks whether volume holds.
Common mistakes
A target the data cannot support
If a campaign has few conversions, the platform has little to base its predictions on and results can swing widely.
Questions
Target CPA treats all conversions as equal. Target ROAS needs conversion values and suits cases where conversions differ a lot in worth, such as plans of different sizes.
