Google Ads Conversion Tracking: How to Set It Up So Your Numbers Are Real

Google Ads optimizes toward whatever you tell it counts as a conversion. If that’s a page view, a button click or a form counted twice, the platform will happily find you more of those, and your cost per lead will look better than it really is. Getting conversion tracking right is the most important thing to do before spending more on ads.

This guide covers how to set it up properly, the mistakes we see most often, and how to check it’s working.

What should count as a conversion

A conversion should be an action with real value to your business. For most service businesses that means:

• A submitted contact or quote form
• A phone call from an ad or your website
• A booked appointment
• A purchase, for online stores

Page views, scrolls and clicks on a contact button are useful for analysis in GA4, but they shouldn’t be the conversions your campaigns bid toward.

Primary and secondary conversion actions

Google Ads lets you set each conversion action as primary or secondary. Primary actions are used for bidding and appear in the main Conversions column. Secondary actions are recorded for reference but don’t drive bidding. Keep only real leads or sales as primary, and set smaller actions to secondary.

How to install tracking

1. Google Tag Manager. Our preferred option. Tags and triggers live in one container, changes can be tested in preview mode before publishing, and tracking is easier to maintain when your website changes.
2. The Google tag added to the site. Workable for simple sites, but harder to manage as you add more tracking.

You can also import conversions from GA4 into Google Ads. It’s convenient, but conversions tracked by Google Ads tags usually report faster, which helps bidding.

Track form submissions properly

Fire the conversion on a genuine success signal: a thank-you page that only loads after a real submission, or a success event from the form itself. Tracking clicks on the submit button counts failed and empty attempts as leads.

Track phone calls

Calls are often a large share of leads for local businesses, and they’re easy to miss. Set up:

• Calls from ads, using call assets with call reporting turned on.
• Calls from your website, using Google’s website call conversions, which show a Google forwarding number to visitors who arrived from an ad, where that feature is available.
• Taps on click-to-call links, as a secondary action, since not every tap becomes a call.

Set a minimum call length so short misdials don’t count as leads.

Avoid double counting

Double counting is one of the most common problems we find. Typical causes:

• The same form tracked by a Google Ads tag and a GA4 import, both set as primary.
• A thank-you page that fires the tag again when someone refreshes it.
• Lead conversion actions set to count every conversion.

For leads, set the count to “One”, so a person who submits twice counts once. Use “Every” for purchases, where each transaction matters.

Consider enhanced conversions

Enhanced conversions send hashed customer details, such as the email address from a form, alongside the conversion. This helps Google match conversions to ad clicks when cookies are limited. Set it up in line with your privacy policy, and with consent mode where your visitors’ region requires it.

Import results from your CRM

If leads become customers later, after a quote or a sales call, you can import those outcomes into Google Ads. Bidding can then favor the searches that produce customers, not just form fills. This is where tracking and a well-kept CRM start working together.

Test before you trust the numbers

1. Use Tag Manager preview mode to confirm each tag fires once, on the right action.
2. Submit a real test lead and check it appears in Google Ads.
3. Compare conversions in Google Ads with the leads in your inbox or CRM for the same week.
4. Check again after any website or form change.

If the numbers don’t roughly match, fix tracking before touching budgets.

The same rules apply to Meta

If you run Facebook and Instagram ads, set up the Meta pixel and the Conversions API together, deduplicate events with a shared event ID, and optimize campaigns for real leads rather than clicks.