GA4 conversion tracking: set up key events that matter

Key events: GA4's conversions

Google defines a key event as an event that measures an action particularly important to the success of your business. Standard properties can mark up to 30 events as key events, and 360 properties up to 50. Keep the list short: a few real outcomes are easier to trust than dozens of signals.

Step 1: Choose the outcomes

Track outcomes. Typical key events:

• Lead businesses: a confirmed form submission, a booked call or demo, a click-to-call on a phone.
• Stores: a purchase, with value and currency.
• SaaS: a trial started, an account activated, a plan bought.

Step 2: Make each event fire once, on success

The event must fire when the outcome happens and only then: on the thank-you page or the success message, not when the form appears or the button is clicked. Enhanced measurement's automatic form interaction events are a starting point, but test them before treating them as submissions; many sites need a custom event sent on confirmed success, usually through Google Tag Manager.

Add parameters that help later analysis, such as the form name or lead type, and register the ones you report on as custom dimensions.

Step 3: Mark the events as key events

Google's help page describes two ways: star an existing event under Admin, Events (Editor access), or create a new event with "Mark as key event" switched on (Marketer access). Mark only the outcomes chosen in step 1.

Step 4: Send key events to Google Ads

If you bid on conversions in Google Ads, link the accounts under Admin, Product links, Google Ads links; Google's linking guide says Ads data appears in Analytics within 48 hours, and that you create Google Ads conversions from GA4 key events to bid on them. It also notes that an unlinked Ads account stops importing key events, so keep the link in place. Our performance marketing work relies on this link being right.

Step 5: Test

Before relying on the numbers:

• Use Tag Manager's preview mode and Tag Assistant to see which tags fired and in what order.
• Check each key event appears once in GA4's debug view for one real test submission.
• Submit a form with an error, then correct it: the event should fire only after success.
• Test on a phone and with the consent banner in each state.

Step 6: Reconcile with your lead record

Each month, compare key event counts with the leads or orders in your own records for the same period. Gaps are normal (consent choices, ad blockers, duplicate submissions, spam) but they should be stable and explained. Count leads as people in your lead record or CRM; GA4 tells you where they came from.

How credit is assigned

GA4 credits key events to channels using an attribution model. Google's attribution help lists the models now available: data-driven, paid and organic last click, and Google paid channels last click. Our guide to marketing attribution models explains what each means for B2B.

Common conversion tracking mistakes

The faults we find most often in accounts we review:

• Counting form views or button clicks as conversions.
• Events that fire twice, once from the site and once from Tag Manager.
• Too many key events, so the important ones are lost.
• No reconciliation with real leads or orders.
• Importing the same conversion twice into Google Ads, from GA4 and from the Ads tag.

Conclusion

GA4 conversion tracking means choosing the few outcomes that matter, making each fire once on success, marking them as key events, importing them into Google Ads if you bid on them, testing in preview and debug view, and reconciling with your lead record each month. Key events are signals; leads are people in your own records.

PromotEdge International is an international strategy, technology, marketing and design company, and our delivery team is in India. Our analytics team sets up key events and Google Ads imports and checks them against your lead record every month.

Facts we rely on: see our company facts for what we state about ourselves and where each fact comes from.