The only GA4 metrics that actually matter for growth

Google Analytics 4 has more metrics than any team can monitor. Engagement rate, average engagement time, events per session, scroll depth, form interactions, outbound clicks, file downloads... the list goes on forever.

Most teams respond by tracking everything and understanding nothing. They build dashboards with 30 widgets, check them once, and never look again because the information overload is paralyzing.

Here are the only metrics that matter for growth decisions, why they matter, and what to do when they move.

1. Sessions by Source (With Conversion Context)

Not just total sessions — sessions broken down by where they came from, with conversion data attached. Knowing you got 10,000 sessions last month is useless. Knowing you got 4,000 from organic search (2.1% conversion rate), 3,000 from paid (1.8%), and 2,000 from referral (3.4%) is actionable.

Action: Invest more in the channels with the highest conversion rate, not just the highest volume. A channel that sends 500 highly qualified visitors beats a channel that sends 5,000 bounces.

2. Landing Page Conversion Rate

Which pages are people arriving on, and what percentage take the next action? This tells you which pages are working and which are leaking.

Action: If a page gets significant traffic but has a below-average conversion rate, it needs attention — the content, the CTA, or the page experience needs improvement. If a page has a high conversion rate but low traffic, invest in driving more traffic to it.

3. Engagement Rate (With Context)

GA4's engagement rate replaces the old bounce rate. An engaged session is one that lasts longer than 10 seconds, has 2+ page views, or triggers a conversion event. This is a better metric because it accounts for pages where bouncing is normal (blog posts, FAQ pages).

Action: Compare engagement rate across page types, not as a site-wide average. Your blog might have 45% engagement and your pricing page might have 75%. Both could be healthy. What matters is the trend — is it going up or down?

4. Key Events (Conversions)

GA4 calls conversions "key events." Set up the ones that matter for your business: form submissions, signup completions, demo requests, purchases. Then track them religiously.

Action: Know your conversion rate for each key event by channel, by landing page, and by device. When it drops, investigate immediately. When it rises, understand why so you can replicate it.

5. Path Exploration

Where do users go after landing? GA4's path exploration shows you the most common journeys through your site. This reveals whether users are following the path you designed or creating their own.

Action: If users consistently navigate from your pricing page to your FAQ before converting, they have questions your pricing page isn't answering. Fix the pricing page. If users bypass your feature pages entirely and go straight to pricing, your homepage is doing its job — they already understand the product.

6. Scroll Depth on Key Pages

For long-form pages (landing pages, blog posts, pricing), scroll depth tells you how far people are reading. If 80% of visitors never see the bottom half of your pricing page, that comparison table you spent two weeks building is invisible.

Action: Put your most important content where people actually see it. If scroll depth is low, shorten the page or improve the above-fold content to earn the scroll.

7. Device Breakdown With Conversion Split

What percentage of your traffic is mobile vs. desktop, and how do conversion rates compare? Most sites see 60%+ mobile traffic but significantly lower mobile conversion rates. That gap is money on the table.

Action: If your mobile conversion rate is less than half your desktop rate, you have a mobile UX problem. Common issues: forms that are hard to fill on mobile, CTAs that require precise tapping, and content that's too wide for small screens.

What to Ignore

Ignore: total pageviews (vanity metric), average session duration (misleading), pages per session (depends on site structure), and demographic data (interesting but rarely actionable).

Also ignore any metric that doesn't connect to a decision. If knowing a number wouldn't change what you do tomorrow, you don't need to track it.

Building Your Dashboard

Create one dashboard with these 7 metrics. Check it weekly. Set up alerts for significant changes (>15% week-over-week movement on any key metric). That's your growth pulse.

When a metric moves significantly, investigate. When it doesn't move, keep executing. Simple.