Most service businesses close deals on the phone. If you’re only tracking form submissions in Google Ads, you’re making optimization decisions based on half your conversion data.
I’ve audited accounts where form-tracked conversions showed a $400 CPL. Once we added call tracking, the actual CPL dropped to $180. The campaigns that looked expensive were actually fine — they were just generating more phone calls than form fills.
Why Does Call Tracking Matter for Google Ads?
Google’s optimization algorithm optimizes toward whatever you’re tracking as a conversion. If you’re only tracking form submissions, the algorithm pushes budget toward traffic that fills out forms.
But if half your leads call instead of fill out forms, you’re telling Google to ignore the keywords, audiences, and ad copy that produce your best phone leads. The algorithm optimizes against an incomplete signal.
Call tracking closes that loop.
What Are My Options for Call Tracking in Google Ads?
Google’s Native Call Tracking
Google provides a free call tracking option through Google Ads call extensions and call-only ads. You add a Google forwarding number to your ads — when someone calls that number, Google records it as a conversion.
Pros: Free, easy to set up, integrates directly with Google Ads bidding. Cons: Limited reporting. You can’t see who called, call duration beyond a set minimum, or what happened after the call.
Third-Party Call Tracking (CallRail, CallTrackingMetrics, etc.)
These platforms assign unique phone numbers to different traffic sources — your Google Ads can have a different number than your Facebook Ads and your organic website traffic. When someone calls, the platform records the source, call duration, and often the recording.
Pros: Rich data on caller source, call quality, and outcomes. Integrates with Google Ads for conversion tracking. Also tracks calls from organic, social, and other sources. Cons: Monthly cost. Requires some setup to connect to Google Ads.
For most businesses taking more than 20-30 calls per month from ads, third-party call tracking pays for itself quickly in better optimization data.
How Do You Set Up Call Tracking in Google Ads?
Google native call tracking:
- Go to Assets (formerly Extensions) → Call assets
- Add your business phone number
- Enable call reporting and set minimum call duration to count as a conversion (usually 60-90 seconds — enough to indicate real interest)
- Add this as a conversion action in your conversion settings
Third-party integration (CallRail example):
- Set up a CallRail account, assign a tracking number to your Google Ads traffic
- Use CallRail’s Google Ads integration to pass call conversions back to Google Ads automatically
- Set conversion events in Google Ads to include calls above your duration threshold
What Call Duration Should Count as a Conversion?
For most service businesses: 60-90 seconds minimum.
Calls under 60 seconds are usually wrong numbers, people who called and hung up before connecting, or very brief exchanges that don’t indicate real interest. Counting these as conversions inflates your conversion numbers and degrades bidding algorithm quality.
Calls over 90 seconds are almost always real prospects. Some businesses set 120 seconds or longer for high-consideration services.
Test your own average call duration for leads that actually convert. Set your threshold just below the typical duration of a ‘real’ call.
What Do You Do With Call Tracking Data Once You Have It?
Compare conversion rates and CPL by campaign, ad group, and keyword — including both form fills and calls together.
You’ll often find that certain keywords drive primarily form fills while others drive primarily phone calls. Neither is better inherently — what matters is which produces better-quality leads.
If calls produce higher close rates than form fills, push budget toward campaigns and keywords that generate call conversions. If form fills produce better-quality prospects, optimize the other direction. Without call tracking data, you can’t make this distinction.