Hundreds of metrics exist. Choose a short list tied to goals, then review them weekly. Vanity metrics (likes, raw pageviews) only matter when they predict revenue or qualified leads.
Learning Objectives
By the end of this chapter, you will be able to:
- Explain traffic, engagement, and conversion metrics in GA4.
- Interpret engagement rate and bounce rate correctly.
- Select channel KPIs tied to business goals.
- Compare channels using key event rate and cost per key event.
Traffic and Acquisition Metrics
- Users: Distinct people (approximate) who visited.
- Sessions / sessions with engagement: Visits; GA4 emphasizes engaged sessions (meaningful activity) over old bounce-heavy thinking.
- Views: Page or screen views.
- Traffic source / medium / campaign: Where demand came from (requires clean UTMs for paid/email).
Engagement Metrics (GA4)
- Engaged sessions / engagement rate: Share of sessions with meaningful interaction (replaces over-reliance on classic bounce rate).
- Average engagement time: How long users actively engage.
- Events per session: Depth of interaction (scrolls, video plays, clicks).
- Landing page performance: Which entry pages start good journeys.
In GA4, a session counts as engaged if it lasts longer than 10 seconds, has a key event, or has two or more page or screen views. Bounce rate in GA4 is simply the opposite of engagement rate (100% − engagement rate).
Bounce rate still appears in some reports and older exam materials, but treat it carefully — a useful one-page FAQ can “bounce” and still succeed if the key event fires.
Conversion and Outcome Metrics
- Key event rate (conversion rate): Share of sessions/users completing a key event.
- Key event count: Volume of desired actions.
- Cost per conversion / CPA: Ad spend ÷ conversions.
- ROAS / revenue: For ecommerce; for lead-gen use lead quality, not only form volume.
Channel KPI Examples
| Channel | Core KPIs |
|---|---|
| SEO | Organic users, landing page engagement, key events from organic |
| PPC | CTR, CPC, conversion rate, ROAS/CPA, Quality Score / Ad Rank inputs |
| Social | Reach, engagement rate, CTR, cost per messaging conversation |
| Deliverability, open/click (cautiously), conversion from email sessions |
Nepal practice: Report “inquiries” (forms + calls + WhatsApp) as one outcome family so festival campaigns are judged on leads, not only reach.
Worked Example: Comparing Channels
A tuition centre reviews one month:
| Channel | Sessions | Engaged sessions | Key events (enquiries) | Spend (Rs.) |
|---|---|---|---|---|
| Organic search | 2,500 | 1,500 | 75 | 0 |
| Paid search | 1,200 | 840 | 60 | 30,000 |
| Paid social | 4,000 | 1,600 | 40 | 24,000 |
| Channel | Engagement rate | Key event rate | Cost per enquiry |
|---|---|---|---|
| Organic search | 60% | 3.0% | — |
| Paid search | 70% | 5.0% | Rs. 500 |
| Paid social | 40% | 1.0% | Rs. 600 |
Paid search costs more per session but converts best. Paid social brings many visits with low engagement; before cutting it, the centre checks whether it creates awareness that later shows up as organic and brand searches.
Case study: Picking KPIs for a news vs clinic site
OnlineKhabar-style media optimizes engagement time and pages/session (ad inventory). A clinic optimizes booked appointments and show-up rate. Same GA4 product, different North Stars — the clinic ignored bounce on a one-page “call us” lander once call key events rose.
Summary
Marketers should track a short list of metrics tied to goals. Traffic metrics (users, sessions, views, source/medium) show where visitors come from; engagement metrics (engaged sessions, engagement rate, engagement time) show whether they find value; outcome metrics (key event rate, CPA, ROAS, lead quality) show business results. In GA4, bounce rate is the opposite of engagement rate and must be read in context. Comparing channels on key event rate and cost per result guides budget decisions.
Key Takeaways
- Choose a few metrics linked to goals and review them weekly.
- GA4 engaged session: over 10 seconds, a key event, or two or more views.
- Bounce rate = 100% − engagement rate; read it in context.
- Compare channels on key event rate and cost per key event.
Discussion Questions
- Why would a news portal and a clinic choose different KPIs?
- Is a high bounce rate always bad? Give an example where it is not.
- How should a business judge a channel that brings awareness but few direct conversions?
Exam-Style Questions
Short answer
- Distinguish between users and sessions.
- What is an engaged session in GA4?
- How is bounce rate related to engagement rate in GA4?
- Name two KPIs each for SEO, PPC, and email.
Long answer
- Explain the key traffic, engagement, and conversion metrics used in web analytics.
- Using sample data, compare the performance of three marketing channels and recommend how to allocate budget.
