Google Ads

Measuring Ads with GA4: What's Behind Every Visit to Your Site?

Updated: 3 June 2026
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Short answer

GA4 is a free analytics tool that tracks visitor behaviour on your website and measures how much each channel — including Google Ads — contributes to actual sales. The previous version, Universal Analytics, was permanently shut down in July 2023; GA4 is now the only supported standard. When you connect GA4 to your Google Ads account, you can see exactly which ad, keyword, or campaign brings in real customers, so you can stop wasting budget and invest in what actually works.

Universal Analytics Is Gone — GA4 Is Now the Only Standard

If your site was set up before 2023 and the analytics have not been touched since, there is a good chance you are collecting little or no data right now. Universal Analytics, which Google shut down in July 2023, no longer records new data. If you have not switched to GA4, the visitor and conversion history of the last two or three years is simply missing. GA4 is a one-time setup — once it is in place, data starts accumulating automatically.

July 2023

The date Universal Analytics shut down — per Google's official announcement, the old version stopped recording new data from this date onwards.

What Can You Learn with GA4?

  • Where visitors found you: Google search, paid ads, social media, direct, or via another site
  • Which pages attracted the most attention and where visitors dropped off
  • Which target actions were completed — phone calls, form submissions, purchases
  • Behaviour differences between desktop, tablet, and mobile visitors
  • If Google Ads is connected: which keyword or ad group drove conversions and which only got clicks

One of the most important uses of GA4 is linking it to your Google Ads account. Once connected, you can see not just the number of clicks on each campaign, but what those clicks actually produced on your site. If an ad got 500 clicks but zero form submissions, that budget was wasted. If another ad brought 30 form submissions from just 100 clicks, shifting budget there is the logical move. This decision is based directly on data — not guesswork.

Defining a 'conversion' in GA4 is the most important step in the entire measurement process. A conversion is any action that matters to your business: a form submission, a phone call, an add-to-cart, or a purchase. Skipping this step means you will never truly know whether your campaigns are working.
Since 2024, collecting user consent has been mandatory under KVKK and GDPR. Google's Consent Mode v2 is a setup that allows measurement to continue in a limited way even when a visitor does not accept cookies. Without it, a significant portion of GA4 data may be missing — Google Ads conversion tracking is especially affected.

Frequently asked questions

If I don't have GA4 set up, how can I tell whether my Google Ads are working?

Google Ads shows you clicks and impressions but not what visitors did after they arrived on your site. Without GA4, you have no way of knowing whether the person who filled in a form, called you, or made a purchase came from that ad. You see clicks but not outcomes. Without the GA4 and Google Ads connection, optimising your campaigns means relying largely on guesswork.

Does setting up GA4 require technical knowledge?

The basic setup can be done in a few steps through a tool like Google Tag Manager, but correctly defining conversions, implementing Consent Mode v2, and linking Google Ads properly involves technical detail. A GA4 that is set up incorrectly can be just as misleading as having no GA4 at all. Having the initial setup done with expert or agency support makes a meaningful difference to data quality in the months ahead.

Is GA4 free, or do I need a paid plan?

Standard GA4 is completely free and covers the needs of the vast majority of small and medium-sized businesses. Google does offer a paid enterprise version, but that is intended for high-volume, large-scale sites. As a small business, the free version of GA4 is more than enough.

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