What Is Conversion Tracking?
Conversion tracking is the system within Google Ads that measures what happens after a user clicks your ad. Without it, you know how many clicks and impressions your campaign generated, but not how many of those clicks resulted in something valuable to your business. With conversion tracking properly configured, you can see exactly which keywords, ads, and campaigns are generating leads, sales, and phone calls, and which are consuming budget without producing results.
There are four main conversion types in Google Ads. Website conversions fire when a user completes a specific action on your site, such as reaching a thank-you page after submitting a form, or completing a checkout. Phone call conversions fire when a user calls a Google forwarding number shown in your ad or clicks a call button on your website. App conversions track installs and in-app actions. Import conversions allow you to bring offline data back into Google Ads, which is covered in offline conversion tracking.
Once conversion tracking is active and collecting data, Google's Smart Bidding strategies such as Target CPA and Target ROAS can use that data to adjust bids in real time for each auction. This is significantly more effective than manual bidding because Smart Bidding considers hundreds of contextual signals per auction, including device, location, time of day, and audience segment. For South African businesses competing in high-value categories like insurance, legal services, or property, Smart Bidding informed by accurate conversion data can materially improve cost per lead over several weeks of learning.
A common mistake is tracking proxy metrics as primary conversions. If a Durban-based gym tracks "viewed the pricing page" as a conversion, its bidding system will optimise for page views rather than membership sign-ups. Primary conversions should always reflect direct business value. Secondary conversions can track softer engagement signals for analytical purposes, but they should be excluded from the "bid" column to avoid distorting Smart Bidding optimisation.
Conversion Tracking In Practice
A Johannesburg medical practice running Google Ads for "private GP Johannesburg" should track at minimum two conversions: appointment booking form submissions and click-to-call events from the website. Using Google Tag Manager, the practice's web developer can deploy the Google Ads conversion tag on the booking confirmation page without touching the core website code. Call tracking can be set up via a Google forwarding number displayed in the ad, which records calls lasting longer than a specified duration as conversions.
Once these two conversion actions are running and have gathered at least 30 to 50 conversions each over a 30-day period, the account is ready to switch from manual CPC bidding to Target CPA. The system will then begin optimising bids to achieve the maximum number of appointments at the target cost per booking. For a typical South African medical practice spending R8,000 to R15,000 per month on Google Ads, the move from manual to Smart Bidding with accurate conversion tracking typically reduces cost per appointment by 20 to 40 percent within the first 60 days of optimisation.
FAQ
How do I set up conversion tracking in Google Ads?
In Google Ads, navigate to Goals and create a new conversion action. Choose the type (website, phone call, app, or import). For website conversions, Google generates a tag snippet you install on your thank-you or confirmation page. For South African businesses using WordPress or similar platforms, Google Tag Manager is the recommended method to deploy the tag without editing code directly.
What is the difference between a primary and secondary conversion in Google Ads?
A primary conversion is a high-value action that directly reflects business success, such as a quote request or product purchase. It feeds into Smart Bidding and campaign optimisation. A secondary conversion is a supportive action like a page visit or video view that provides context but does not drive bidding. Setting the correct primary conversions is essential for accurate automated bidding.