Setting Up Conversion Events in GA4: A Step-by-Step Guide for Small Businesses

Traffic numbers are vanity metrics unless you know what that traffic is doing. If someone visits your website and then calls you, fills in a contact form, or books an appointment, that's a conversion — the moment a visitor becomes a potential client. Without conversion tracking, you have no way of knowing which traffic sources, pages, or campaigns are actually generating business. You're investing in marketing without any way to measure the return.

In Google Analytics 4, conversions are measured as "events" — specific actions a user takes on your site. The old Universal Analytics "Goals" no longer exist; instead, you mark important events as conversions in the GA4 interface. This guide explains how to identify the conversions that matter for your business, how to set them up in GA4 with and without Google Tag Manager, and how to use the data once it's flowing.

What to Track: Identifying Your Key Conversions

Before configuring anything, decide what counts as a successful outcome on your website. For most service businesses the primary conversions are: a contact form submission (the visitor sent an enquiry), a phone number click on mobile (they tapped to call), an email address click, a booking or appointment completed, or a document downloaded (for businesses that use guides or brochures as lead generation tools). For ecommerce websites, purchase completion is the primary conversion, with add-to-cart and checkout initiation as secondary micro-conversions.

Prioritise one or two primary conversions to focus on rather than trying to track everything at once. The most important conversion for a service business is almost always the contact form submission, because it's the clearest signal that a visitor wanted to get in touch. Once that's tracking correctly, add phone clicks and any other meaningful actions. At Xpose, the first conversion we configure for every client is thank-you page tracking for their contact form — when someone submits the form and lands on a thank-you page, that page view is the cleanest possible signal that a conversion has occurred.

How to Set Up Conversion Tracking in GA4

The simplest method for a contact form is thank-you page tracking. If your contact form redirects to a unique thank-you page after submission (e.g., /thank-you), navigate to Admin > Events in GA4, click Create Event, and create a new event triggered when the page_view event fires with a page_location matching your thank-you URL. Then go to Admin > Conversions, click New Conversion Event, and enter the name of the event you just created. Within 24 to 48 hours, GA4 will begin attributing conversions to the traffic sources that drove form completions.

For phone number clicks, GA4 automatically tracks outbound link clicks if you have enhanced measurement enabled (Admin > Data Streams > select your stream > Enhanced Measurement). Ensure "Outbound clicks" is toggled on. Phone number links in HTML use the format tel:+441234567890 — GA4 will track clicks on these as outbound link events with the link URL as the phone number. You can then mark this event as a conversion. For sites without a thank-you page redirect — where the form submits via AJAX and shows an inline confirmation — you'll need Google Tag Manager to fire an event on form submission success, which is slightly more complex but well within the reach of most web developers.

Using Conversion Data to Make Better Decisions

Once conversions are tracking, the Traffic Acquisition report becomes dramatically more useful. You can now see not just which channels drive the most visitors but which channels drive the most conversions — and these two lists are rarely identical. A social media campaign might drive large volumes of traffic with poor conversion rates, while organic search might send fewer visitors but convert at three or four times the rate. This data tells you where your marketing budget and effort should be concentrated.

Set up a monthly conversion review: check total conversions, conversion rate by channel, conversion rate by landing page, and how conversions are trending week-on-week. A sudden drop in conversions — even if traffic is stable — often indicates a broken contact form, a website error, or a change to a key landing page that has reduced its effectiveness. At Xpose, we configure conversion rate alerts for clients so they receive an automated notification if their conversion rate drops significantly in any seven-day period, allowing problems to be identified and fixed before they cost significant business.