Google Ads conversion tracking measures the actions users take after clicking an ad — whether that is making a purchase, submitting a form, calling a phone number, or completing any other business-valuable action. Conversion tracking is implemented by adding a Google Ads conversion tag (or Google Analytics 4 goal import) to the website, firing specific events when conversion actions occur. Without conversion tracking, Google Ads cannot optimise campaigns for conversions, Smart Bidding cannot function correctly, and accurate ROI measurement is impossible.
Conversion tracking is the single most important setup element in any Google Ads account. An account without proper conversion tracking is operating blind — spending budget based on clicks and impressions rather than business outcomes. Despite this, a significant proportion of UK Google Ads accounts have conversion tracking that is misconfigured, incomplete, or measuring the wrong events. Conversion tracking setup and validation should be the first task before any campaign goes live.
Conversion tracking setup checklist
- Identify conversion actions — what specific events constitute a successful conversion? (purchase, form submission, phone call, app download)
- Choose implementation method — Google Ads tag, Google Tag Manager, or GA4 import (GA4 import is recommended as single source of truth)
- Create conversion actions in Google Ads — one conversion action per distinct action type
- Implement tracking tags — place the conversion code on thank-you pages or configure event-based firing in GTM
- Set correct attribution model — use data-driven attribution where conversion volume allows (300+/month threshold)
- Assign conversion values — for revenue, import actual order values; for leads, assign estimated lead values for ROAS optimisation
- Set conversion windows — define how long after a click a conversion should be attributed to that click (30-90 days depending on purchase cycle)
- Validate tracking — use Google Ads' conversion diagnosis tool and Tag Assistant to verify tags fire correctly
Micro-conversions are smaller actions that indicate progress toward a purchase but are not themselves the primary conversion goal — examples include newsletter signups, product page views, add-to-cart events, PDF downloads, or video engagement. Tracking micro-conversions provides additional signals for Smart Bidding when primary conversion volume is low (under 30/month), and helps diagnose where users drop out of the conversion funnel. However, never set micro-conversions as the primary optimisation goal for Smart Bidding — this will optimise for engagement rather than revenue.
Google Ads offers several phone call tracking methods. Calls from ads: tracking direct calls from phone number extensions in Google Ads (calls over 60 seconds default). Calls from website: using Google forwarding numbers on your website to track calls from any traffic source. Third-party call tracking: services like CallRail, Mediahawk, or Infinity Tracking that replace website phone numbers with tracked numbers and integrate with Google Ads. For businesses where phone calls are the primary conversion action (professional services, home services, healthcare), proper call tracking is as important as form submission tracking.