Glossary

Engagement Rate (GA4)

Engagement rate is the share of sessions that were 'engaged': lasted over 10 seconds, had a key event, or included at least two page views. It's GA4's inverse of the old bounce rate: it measures how many visits showed any real interaction.

Formula: Engagement rate = Engaged sessions ÷ Sessions × 100

How to read it

Compare engagement rate per campaign and landing page: low engagement from one campaign's traffic while others do fine points at audience or message mismatch, not the site.

Where it misleads

The 10-second threshold is generous: a session can be 'engaged' without anyone reading anything. Use it comparatively, not as an absolute quality seal.

Related terms

Sessions (GA4) →

A session is one visit to your website: it starts when a user arrives and ends after 30 minutes of inactivity. One user can have many sessions. Sessions measure visit volume, the standard unit for 'how much traffic did the campaign send?'.

Avg. Session Duration (GA4) →

Average session duration is the mean time visitors spent on your site per session. It approximates depth of interest: longer sessions usually mean content that holds attention. For ad traffic, it shows whether clicks brought people who actually wanted to be there.

Key Events (GA4) →

Key events are the GA4 events you marked as most valuable: purchases, sign-ups, contact form submissions. They are GA4's successor to 'conversions' (renamed in 2024) and the website-side counterpart to your ad platforms' conversion tracking.

Metrics explained are nice. Metrics watched are better.

HeyMetrix monitors all of these across Google and Meta, with alerts and a nightly AI briefing.

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