Definition
Session Depth quantifies how much a user accomplishes within a single visit. Higher session depth generally indicates the product provides enough value to keep users engaged beyond a single task. However, context matters — very high session depth in a task-management tool might indicate efficiency problems rather than engagement. Pair this metric with Time-on-Task and Task Completion Rate for the full picture.
Formula
How to measure
Count distinct meaningful events within each session (exclude passive events like page views if they are not the core action). Divide by total session count. Define session boundaries using standard timeout (typically 30 minutes of inactivity). Report per user segment.
Industry benchmarks
Content platforms: 5–15 actions/session. SaaS tools: 3–8 actions/session. E-commerce: 4–12 actions/session. If session depth is below 2, users may not be finding enough value to explore beyond their initial intent.