Target CPA
Smart Bidding strategy that automatically adjusts bids to achieve your desired cost per conversion.
Definition
Target CPA (Cost Per Acquisition) is a Smart Bidding strategy that automatically sets bids to help get as many conversions as possible at or below your target cost per conversion. You set the CPA you want (e.g., $100 per consultation booking), and Google's algorithm adjusts your bids in each auction to hit that target on average across all impressions. Some conversions will cost more than your target; some will cost less — Target CPA averages toward your goal.
The Practitioner's Perspective
Target CPA works by raising bids (to compete harder) for auctions Google predicts are high-probability to convert, and lowering bids (or even not competing) for low-probability auctions. This means your impression share may decrease when you switch from Maximize Conversions to Target CPA — the algorithm is now being selective about which auctions are worth entering at your target CPA. This is by design, not a bug.
Setting the right Target CPA requires starting from real data. If your current average CPA is $120, don't set a target of $60 immediately — the algorithm will struggle and underperform. Instead, set a target 10–20% above your current CPA ($135–$145) and let it optimize. Once it's consistently hitting that target, reduce gradually (10% at a time) over 2–3 week intervals to squeeze down to your ideal number.
Target CPA is best suited for healthcare accounts with consistent conversion tracking and sufficient monthly volume (15–30+ conversions per month). Below that volume, the algorithm has insufficient data to optimize effectively. For lower-volume accounts, Maximize Conversions (no CPA target) is more appropriate — it focuses on getting conversions within budget without the added constraint of a cost target the algorithm can't reliably hit.
Frequently Asked Questions
What Target CPA should I set for my healthcare practice?
Start 10–20% above your current average CPA. If you don't have prior data, estimate backward: if your procedure is worth $3,000 and you want 3:1 ROI from ads, you can afford $1,000 CPA. For a med spa Botox lead, if average lifetime value is $900 and you want 2:1 ROI, $450 CPA is your ceiling.
Why is my Target CPA exceeding my target?
The algorithm targets your CPA on average over time, not every single conversion. Short-term fluctuations are expected. If you're consistently 30%+ above target over 4+ weeks, either the target is too aggressive for your market competition level, or your conversion tracking is incorrect.
Should I use Target CPA or Target ROAS?
Use Target CPA when conversions are roughly equal in value (e.g., all consultation bookings). Use Target ROAS when conversion values vary significantly (e.g., you can track actual procedure revenue per patient). If you can measure revenue, Target ROAS is generally superior.
Related Terms
Put the theory into practice
VortiHQ manages Google Ads for healthcare and aesthetics practices on a performance-based model — you pay us when you close patients, not just when they click.