Conversion Tracking in GA4: What a Small Business Should Track

What to track

For most small businesses, the list is short:

• Form submissions (an enquiry)
• Phone calls or clicks on a phone number
• Email clicks
• Bookings
• Purchases, for online shops
• Newsletter sign-ups

Each of these is something that brings you closer to a sale.

Events and key events

GA4 records what happens on your site as “events”. A page view is an event. So is a form submission. You tell GA4 which events are important by marking them as key events (previously called conversions). Those are the ones that show up in your reports and that you can send to Google Ads.

How to set up a form event

1. Make your form fire an event when someone successfully submits it. Many website builders and form tools can do this, or your developer can add it.
2. Name it clearly, for example `generate_lead`.
3. In GA4, go to Admin, then Events, and mark that event as a key event.
4. Submit a test enquiry and check it appears in Realtime reports.

Fire the event on success, not just when the button is clicked. Otherwise failed submissions get counted as leads.

Tracking where people come from

Add UTM tags to the links you control, such as email campaigns and social posts, so GA4 can tell channels apart:

`?utm_source=newsletter&utm_medium=email&utm_campaign=october`

Keep naming consistent, because “Email” and “email” will show up as separate lines.

Connect it to your ads

If you use Google Ads, link it to GA4 and import your key events, so campaigns can optimise for enquiries instead of clicks. For other ad platforms, use their own tracking tag and check that the numbers broadly match.

Check the data is trustworthy

• Test every key event yourself
• Exclude your own visits and your team’s, so internal tests don’t inflate results
• Compare GA4’s enquiry count with what actually arrives in your inbox
• Check cookie consent is set up properly, because declined consent can reduce what’s recorded

What to look at each month

• Sessions by channel
• Key events by channel and by landing page
• Cost per key event for paid channels
• The pages where people leave

Then connect it to your own records. A lead that never became a customer isn’t a win. See how to measure marketing ROI.

Common set-up problems

Events firing twice. This often happens when a “thank you” page is reloaded. Fire the event only once, on a successful submission.

Spam and test submissions counted. Filter these out, or use a hidden field and validation to stop bots. Check your enquiry numbers against real messages in your inbox.

No tracking on forms that don’t reload the page. Many modern forms submit in the background, so a “thank you page” view never happens. Track the success event itself.

Missing consent handling. If your cookie banner blocks analytics until accepted, you’ll record fewer visits than you really get. This is expected, and it means your numbers are a sample rather than a complete count.

Mixed up traffic sources. Without consistent UTM tags, email and social traffic can be lumped into “direct”. Tag every campaign link.

What to do with the data

Tracking is only worth it if it changes decisions. Some questions it can answer:

• Which pages bring the most enquiries, and which bring the most traffic but no enquiries?
• Which channel gives the cheapest enquiries?
• Do mobile visitors convert as well as desktop visitors?
• Where do people leave the form?
• Which articles lead people on to a service page?

Going a step further

Once the basics work, add events for the steps inside your form, such as each field completed and any errors. That shows where people drop out. You can also record which service or budget someone selected, so you can see which enquiries are most valuable.

For a site with a long sales cycle, connect GA4 to your sales tracker. Record the source of each enquiry when it arrives, and mark whether it became a client. That closes the loop between marketing spend and real revenue.

A short monthly check

1. Test your main key events yourself
2. Compare GA4’s enquiries with your inbox
3. Check for sudden changes in traffic or conversions
4. Look at the top landing pages and where people exit
5. Note one improvement for next month

Small, regular checks catch broken tracking before it costs you weeks of bad data.

Frequently asked questions

Do I need Google Tag Manager?

It makes adding and changing tags easier, but it isn’t essential for a simple site.

Why do my numbers differ from my inbox?

Cookie consent, ad blockers and failed submissions all cause gaps. Aim for close, not identical.

Can you set up tracking?

Yes. Accurate tracking is the first thing we do in performance marketing and SEO projects.