What Is Google Analytics 4 (GA4)?
Google Analytics 4 (GA4) is Google's free web and app analytics platform that measures website traffic and behavior using an event-based data model instead of the sessions-and-pageviews model of the older Universal Analytics. Every interaction, from a page view to a form submit or phone-number click, is recorded as an event with parameters. GA4 became the default in July 2023 and now powers reports on users, engagement, conversions, and acquisition sources for most US business websites.
- Released
- October 2020; replaced Universal Analytics July 1, 2023 (Google)
- Data model
- Event-based, not session-based (Google Analytics Help)
- Cost
- Free standard tier; GA4 360 is paid enterprise (Google)
- Data retention
- Event data 2 or 14 months, user-adjustable (Google Analytics Help)
What is Google Analytics 4 in plain terms? #
Google Analytics 4 is a reporting tool that shows you who visits your website, where they came from, what they do while they are there, and which visits turn into leads or sales. It replaced Universal Analytics, the version many businesses used for over a decade, and works differently under the hood. Instead of organizing data around visits (sessions) and pages viewed, GA4 treats every meaningful action as an event: a page view, a scroll, an outbound click, a video play, a form submission, or a tap on your phone number. Each event can carry extra detail called parameters, such as which button was clicked or which page it happened on. For a local business, that means you can finally answer practical questions like how many people clicked to call from the services page, or which town your website visitors come from. GA4 also unifies website and mobile app data in one property, which most single-location service businesses will not need but which matters for multi-channel brands. Learn how it fits a broader plan in /wiki/what-is-local-seo.
How is GA4 different from Universal Analytics? #
The biggest change is the data model. Universal Analytics counted sessions and pageviews and calculated a bounce rate based on single-page visits. GA4 counts events and engaged sessions, and it reports engagement rate instead of bounce rate, which flips the metric on its head. Universal Analytics kept separate properties for web and app; GA4 combines them. GA4 also relies more heavily on machine learning to fill data gaps and on consent-aware modeling, which reflects tighter privacy rules and cookie restrictions. Reports look different too: GA4 has fewer prebuilt reports out of the box and pushes you toward the flexible Explore section for custom analysis. Many businesses found the transition jarring because familiar numbers moved or disappeared. If your old benchmarks no longer line up, that is expected, not a bug. Because GA4 defines sessions differently, historical comparisons between the two systems are approximate at best. We often pair GA4 setup with a technical review through /services/speed-optimization so the data reflects a fast, healthy site rather than tracking a slow one.
Why should a local business use GA4? #
GA4 tells you whether your website is actually generating business, not just receiving visits. Without it, you are guessing which marketing spend works. With it, you can see that, say, Google Business Profile drove 60 clicks-to-call last month while your Facebook ads drove three. That evidence changes where you spend money. GA4 also shows your most-visited pages, so you know what customers care about, and your top exit points, so you know where they give up. Combined with a call-tracking setup and form-tracking, it connects marketing effort to real leads. For service businesses that live and die by phone calls and appointment requests, this is the difference between marketing on hope and marketing on facts. GA4 is free, which removes the cost barrier entirely. Pair it with your Google Business Profile insights, covered in /wiki/google-business-profile-guide, to see both the map-listing side and the website side of your local presence in one picture.
How does the event-based model work? #
In GA4, everything is an event. When someone lands on a page, that fires a page_view event. When they scroll 90 percent down, that fires a scroll event. When they click a link that leaves your site, that fires a click event. Google automatically collects some of these through a feature called Enhanced Measurement, which captures page views, scrolls, outbound clicks, site searches, video engagement, and file downloads with no coding. Beyond those, you can define custom events for actions specific to your business, like a quote request or an appointment booking. Each event carries parameters that add context, so a generate_lead event might include the form name and the page it came from. Understanding this model matters because your conversions, covered in /wiki/what-is-a-conversion-event, are simply events you have flagged as important. Many setups feed these events through /wiki/what-is-google-tag-manager, which fires them without editing site code.
What are the key GA4 reports and metrics? #
GA4 groups reports into life-cycle stages: Acquisition (how people found you), Engagement (what they did), Monetization (revenue, mainly for ecommerce), and Retention (whether they come back). The metrics you will use most are users, sessions, engaged sessions, engagement rate, average engagement time, event count, and conversions. The Acquisition reports break traffic into channels such as Organic Search, Direct, Referral, Organic Social, and Paid Search, so you can see which sources deliver. The Pages and screens report ranks your content by views and engagement. The Explore section lets you build funnels, path analysis, and segment comparisons that the standard reports do not cover. For a service business, the reports worth watching monthly are traffic by channel, top landing pages, and conversion counts by source. Engagement rate, explained in /wiki/what-is-engagement-rate, replaces the old bounce rate and needs a fresh mental model to read correctly.
How do you set up GA4 correctly? #
Setup starts with creating a GA4 property in analytics.google.com, then adding the tracking snippet, called the Google tag, to every page of your site. Most businesses install it through Google Tag Manager rather than hard-coding it, because that makes future changes easier. Once the tag fires, verify data flows using the Realtime report while you browse your own site. Next, turn on Enhanced Measurement, connect Google Search Console and Google Ads if you run ads, and set your data retention to 14 months. The critical step people skip is marking key events as conversions: without that, GA4 collects traffic but never tells you what worked. Filter out your own internal traffic so your visits do not pollute the numbers. On WordPress sites we usually handle this during a /services/wordpress-development engagement, and on any site you can confirm the tag is present with /tools/website-platform-detector or check overall health with /tools/website-grader.
<!-- Google tag (gtag.js) -->
<script async src="https://www.googletagmanager.com/gtag/js?id=G-XXXXXXXXXX"></script>
<script>
window.dataLayer = window.dataLayer || [];
function gtag(){dataLayer.push(arguments);}
gtag('js', new Date());
gtag('config', 'G-XXXXXXXXXX');
</script>What are GA4's privacy and data limits? #
GA4 was built for a privacy-tighter web. It does not store IP addresses, supports consent mode so tracking respects cookie choices, and uses modeling to estimate behavior when consent is withheld. That modeling means some numbers are approximations, not exact counts, which surprises people used to precise Universal Analytics figures. Data retention for event-level detail defaults to two months and maxes at 14 months, so long-term trend analysis requires exporting to BigQuery, which GA4 offers free at the standard tier. Sampling can also kick in on large or complex Explore queries, again giving estimates rather than exact totals. For US businesses, GA4 helps with privacy-law posture but does not replace a proper cookie consent banner or privacy policy; those are separate legal requirements. If you handle sensitive data or take payments, pair analytics with the protections described in /services/website-security. None of these limits should stop a local business from using GA4; they just set expectations that some figures are directional.
Common GA4 mistakes local businesses make #
The most common mistake is installing GA4 and never marking conversions, so the account records traffic but answers no business question. The second is not filtering internal traffic, which inflates numbers with your own visits and your web team's testing. Third is misreading engagement rate as if it were the old bounce rate; they are related but not identical. Fourth is expecting GA4 to match Universal Analytics numbers exactly, then panicking when they differ. Fifth is running two tags at once or double-firing events, which doubles conversion counts and ruins the data. Sixth is ignoring the tool for months, then trying to analyze a period with no goals defined. Setting it up right from the start avoids all of this. When we build sites through /services/web-design we configure GA4, conversions, and tag management as part of launch, and for existing sites a /services/website-rescue cleanup often includes fixing a broken or duplicated analytics setup that has been quietly logging garbage.
FAQ
Is GA4 free?
Yes. The standard GA4 tier is free for virtually all small and local businesses, with generous event and data limits. Google also offers GA4 360, a paid enterprise version with higher limits, service level agreements, and advanced features, but no local service business needs it. The free tier even includes a no-cost BigQuery export for raw data.
Did GA4 replace Universal Analytics?
Yes. Universal Analytics stopped processing new data on July 1, 2023, and its interface was later shut down. GA4 is the current and only supported version of Google Analytics. If you still have an old Universal Analytics property, its historical data is gone unless you exported it before the shutdown deadline.
Do I need Google Tag Manager to use GA4?
No, but it helps. You can install the GA4 Google tag directly in your site code. Google Tag Manager, covered in /wiki/what-is-google-tag-manager, lets you add and change tags and events without editing site code each time, which is why most professional setups use it. For a simple site, direct installation works fine.
How long does GA4 keep my data?
Event-level data retention defaults to two months and can be extended to 14 months in property settings. Aggregated report data in standard reports is retained longer. For analysis beyond 14 months, connect the free BigQuery export at setup so raw event data is stored indefinitely in your own warehouse.
Why do GA4 numbers differ from my old analytics?
GA4 measures differently. It counts events and engaged sessions instead of sessions and bounces, does not store IPs, and uses modeling when cookie consent is withheld. These differences mean figures rarely match Universal Analytics one-to-one. Treat GA4 as a fresh baseline rather than trying to reconcile it to old numbers.
Can GA4 track phone calls and form submissions?
Yes, as events. Clicks on a tel: link can be tracked, and form submissions can fire a generate_lead event, both markable as conversions. Actual phone calls that come from someone reading your number need separate call-tracking software. We wire these up during /services/conversion-optimization work so every lead source is measured.
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