🔥 Tier 1 - Must KnowID: sessionsUsers
Sessions & Users
The basic units of volume measurement in web analytics
In Simple Words (Zero Jargon):
The basic units of volume measurement in web analytics
Why It Is Critical
Sessions and Users are the two primary volume metrics in GA4. Users represent unique individuals (identified via User ID, Google signals, or device ID). Sessions represent a group of interactions within a continuous time period (30-minute timeout by default). One user can generate multiple sessions.
Calculation Example & Benchmark Matrix
| Metric | What It Means |
|---|---|
| User | A unique individual who visited your site. GA4 uses device ID, user ID, or Google signals. |
| New User | A user visiting for the first time - no prior sessions recorded. Key metric for acquisition. |
| Returning User | A user who has visited before. Key metric for retention and brand loyalty. |
| Session | A group of interactions within a continuous 30-min window. One user can have multiple sessions. |
| Sessions per User | Average sessions per user - indicates audience stickiness and loyalty. |
What You Get: The volume baseline for all other analytics calculations - conversion rate, pages per session, engagement rate, and acquisition cost all derive from these fundamentals.