Here's a stat that should terrify every business running Google Ads: over 40% of Australian advertisers don't have conversion tracking properly configured. That means they're spending thousands of dollars per month with no idea which keywords, ads, or campaigns actually generate revenue.
Conversion tracking is the single most important thing you'll set up in Google Ads. Without it, you can't optimise. You can't calculate ROI. You're guessing - and guessing with paid advertising is expensive.
What Is Conversion Tracking?
Conversion tracking tells Google Ads when a user who clicked your ad completes a valuable action on your website - submitting a form, calling your business, making a purchase, or starting a live chat. This data feeds Google's machine learning algorithms, helping them show your ads to people most likely to convert.
Step 1: Define Your Conversions
Before touching any code, decide what counts as a conversion for your business:
- Primary conversions (drive bidding): form submissions, phone calls, purchases, booking confirmations
- Secondary conversions (observe only): PDF downloads, video views, page scrolls, add-to-cart
Mark only high-value actions as primary conversions. If you mark everything as primary, Google's Smart Bidding will optimise for low-value actions (like page views) instead of actual leads.
Step 2: Set Up Google Tag Manager (GTM)
Google Tag Manager is the recommended way to manage tracking. Here's how to set it up:
- Go to tagmanager.google.com and create an account
- Create a container for your website (choose "Web")
- Install the GTM snippet: paste the first code block in your
<head>and the second immediately after<body> - Verify installation using the GTM Preview mode or the Tag Assistant extension
Step 3: Create Conversion Actions in Google Ads
- In Google Ads, go to Goals → Conversions → Summary
- Click "+ New conversion action"
- Select "Website"
- Enter your website URL and click "Scan"
- Choose "Add a conversion action manually"
- Configure: category (Lead, Purchase, etc.), conversion name, value, count (One for leads, Every for purchases)
- Select "Use Google Tag Manager" and note the Conversion ID and Conversion Label
Step 4: Track Form Submissions
The most common conversion for service businesses. In GTM:
- Create a trigger: Trigger type → Form Submission. Enable "Wait for Tags" and "Check Validation." Fire on the form's page URL or a thank-you page redirect.
- Alternative: Thank-you page trigger: Trigger type → Page View. Fire when Page URL contains "/thank-you" or "/confirmation." This is more reliable than form submission triggers.
- Create a tag: Tag type → Google Ads Conversion Tracking. Enter the Conversion ID and Label from Step 3. Set the trigger to your form/thank-you page trigger.
Step 5: Track Phone Calls
For businesses where phone calls are leads (tradespeople, medical practices, lawyers):
Option A: Google Forwarding Numbers
Google replaces your phone number with a tracking number. Set up in Google Ads under Conversions → Phone calls → "Calls from ads" or "Calls from website."
Option B: Click-to-Call Tracking
Track when someone clicks your phone number on mobile. In GTM, create a trigger that fires on clicks matching tel: links.
Step 6: Track Ecommerce Purchases
For ecommerce businesses, track purchase value dynamically:
- Push purchase data to the GTM data layer from your order confirmation page
- Create GTM variables to capture transaction_id, value, and currency
- Create a Google Ads Conversion Tracking tag with dynamic value using the GTM variable
Step 7: Verify Everything Works
This is where most setups fail - people configure but never verify:
- GTM Preview mode - browse your site in debug mode and submit a test form. Confirm the conversion tag fires.
- Google Tag Assistant - the Chrome extension validates your tags are working
- Google Ads conversion status - after 24-48 hours, check Goals → Conversions. Status should show "Recording conversions"
- Test with real ads - click your own ad (once) and complete a conversion. Verify it appears in Google Ads within 24 hours.
Enhanced Conversions: The Next Level
Enhanced conversions use first-party customer data (email, phone) to improve conversion measurement accuracy, especially as cookies phase out. To enable:
- In Google Ads, go to your conversion action and enable "Enhanced conversions"
- In GTM, update your conversion tag to include user-provided data variables
- Map form fields (email, phone, name, address) to Google's enhanced conversion variables
Enhanced conversions typically recover 5-15% more conversion data that would otherwise be lost to cookie restrictions.
Common Tracking Mistakes to Avoid
- Counting page views as conversions - this inflates your numbers and ruins Smart Bidding
- Not setting conversion values - without values, you can't calculate ROAS
- Double-counting - firing the same conversion tag twice on a single form submission
- Ignoring cross-device conversions - many users click on mobile but convert on desktop
- Not excluding internal traffic - your own team's test conversions skew data
The Bottom Line
Conversion tracking isn't optional - it's the foundation of every profitable Google Ads campaign. Without it, you're spending money with no accountability. With it, every dollar is traceable, every keyword's value is measurable, and Google's algorithms can actively find you more customers like your best ones.
Need help setting up tracking correctly? Our Google Ads management team includes full conversion tracking setup and verification. Book a free audit and we'll check if your tracking is working properly.
