If you’re running a Google Search campaign for an eCommerce brand and you switched to Maximize Conversions, you may have noticed something confusing:
✅ Conversions increase
❌ But CPA stays too high and you’re still not profitable
This is one of the most common scenarios I see in new Google Ads accounts. The good news is: if you’re already getting conversions, you are very close to making it work — you don’t need to start from scratch.
In this guide, I’ll explain exactly what to do (step-by-step) when Maximize Conversions is generating sales but your cost per acquisition is killing your margins.
The Real Scenario (What Most eCommerce Brands Face)
Here’s the setup that many advertisers start with:
- New Google Ads account (around 30 days old)
- Search campaign
- 1 ad group
- 4 keywords (usually phrase match)
- Started with manual bidding (or manual CPC)
- After 30 days: some conversions come in (example: 32 conversions)
- Then you switch to Maximize Conversions
- Next 30 days: conversions increase (example: 42 conversions)
- But CPA is still not profitable
- Budget: around $100/day
- Avg CPC: around $1.20
So the question becomes:
Should I switch to Target ROAS?
Or should I stay on Maximize Conversions and just add more keywords?
First: Don’t Panic-Switch to Target ROAS
I understand why Target ROAS feels attractive. It sounds like the “profit button.”
But Target ROAS is not magic — and if you switch too early, you can actually make performance worse.
Target ROAS works best when:
- You have accurate purchase values (revenue tracking is clean)
- You have enough conversion volume and stable purchase behavior
- The system has enough data to predict high-value buyers
- Your conversion action is correct (purchase, not add-to-cart or page views)
If you’re a new account or your tracking is not perfect, Target ROAS can:
- Over-limit auctions
- Reduce reach too much
- Create unstable performance swings
- Get stuck in learning
So if your account is new and you’re only 30–60 days in, the smarter move is usually:
✅ Maximize Conversions + Target CPA
The Best Fix: Maximize Conversions With Target CPA
When Maximize Conversions is running without boundaries, Google tries to get conversions at any cost. That can increase volume but destroy profitability.
Target CPA gives the algorithm a clear constraint.
What it does:
- Still uses automated bidding and smart signals
- But tells Google: “I want conversions around THIS cost”
How to set it:
- Open your campaign
- Go to Settings
- Find Bidding
- Select Maximize Conversions
- Turn on Set a Target CPA
- Enter your target CPA and save
What Target CPA should you set?
Don’t set it aggressively on day one.
A safer method:
- Start close to your recent average CPA
- Let it stabilize for 7–14 days
- Then gradually reduce the target CPA in small steps
This gives you control without shocking the learning system.
Step 2: Use Search Terms Report to Stop Budget Leaks
If your keywords are phrase match, your traffic is coming from many search terms — and some of them will be irrelevant or low-intent.
That’s where your profitability is leaking.
What to do:
- Open Search Terms
- Sort by:
- Conversions
- Cost / conversion
- Cost
- Identify:
- Terms that generate conversions profitably
- Terms that spend money but never convert
- Irrelevant themes (wrong intent)
Then:
✅ Add converting terms as keywords (exact or phrase)
✅ Create new ad groups for best-performing themes
✅ Add negatives to block waste
This single step can dramatically reduce CPA because you are cutting unnecessary spend while protecting the terms that already convert.
Step 3: Create “Winner” Ad Groups (Don’t Keep Everything in One)
If your campaign has 1 ad group and only 4 keywords, it’s common to see performance limitations.
Once you find converting terms, split them:
Example structure:
- Ad Group 1: Best-selling product keyword theme
- Ad Group 2: Alternative product keyword theme
- Ad Group 3: Brand + product keywords
- Ad Group 4: High-intent “buy” keywords
This improves:
- Ad relevance
- CTR
- Quality score
- Landing page alignment
…and these factors can reduce CPC and CPA.
Step 4: Check Conversion Tracking (Because Bad Tracking = Bad Bidding)
If conversion tracking is wrong, Maximize Conversions will optimize for the wrong thing.
Make sure you are optimizing for:
✅ Purchase (primary)
Not:
❌ Add to cart
❌ Page view
❌ Begin checkout
(unless you are intentionally using them as secondary signals)
Also ensure:
- No duplicate conversions firing
- Conversion values are correct (for ROAS later)
- Enhanced conversions (if possible) are set properly
If tracking is messy, no bid strategy will save you.
Step 5: Make CPA Profitable by Increasing AOV (This is the Secret)
Sometimes you don’t need a lower CPA — you need a higher AOV.
If your CPA is slightly high, you can still become profitable by improving revenue per order.
Quick eCommerce AOV boosters:
- Bundles (Buy 2 and save)
- Combo offers
- Upsells at checkout
- Cross-sells on product pages
- Free shipping thresholds
- “Most popular” bundles highlighted above fold
Even a small lift in AOV can turn an “unprofitable CPA” into a profitable one.
Step 6: Optimize by Time, Day, and Location
Once you have around 30–60 days of data, don’t treat every click the same.
Analyze:
- Which locations produce the best CPA
- Which days convert the most
- Which hours convert the most
Then:
- Increase budget for best-performing segments
- Reduce waste in low-performing times
- Build separate campaigns for top locations (if needed)
This is how you scale smartly.
My Final Recommendation (Simple Plan)
If you’re getting conversions but CPA isn’t profitable, do this:
- Switch to Maximize Conversions + Target CPA
- Clean & expand using Search Terms Report
- Build new ad groups around winning queries
- Verify purchase tracking is 100% correct
- Improve landing page + offer + AOV
- Scale based on location/day/hour data
If conversions exist, you already have proof. Now it’s about tightening the system and improving profitability.
Need Help Fixing High CPA in Google Ads?
If you want a professional audit of your Search campaign (keywords, search terms, bidding, tracking, landing pages, and profitability), you can hire me and my team.
We are AARSWEBS.com, a Google Ads Partner company, helping clients with Google Ads since 2011.
Check the link on my site / video description to get started.