Definition
Customer lifetime is how long customers remain active before churn. Lifetime matters because it drives LTV and payback viability.
Simple formula (shortcut)
Customer lifetime (months) ~ 1 / monthly churn rate
Worked example
If monthly churn is 3%, the simple estimate is lifetime ~ 1 / 0.03 ~ 33.3 months. This is useful for planning but can be wrong if churn changes over tenure.
Why the shortcut breaks
- Churn is usually higher early and lower later (tenure effects).
- Segments behave differently (SMB vs enterprise).
- Expansion and downgrades change revenue lifetime vs logo lifetime.
A better approach
- Use cohort retention curves (logo and revenue) to measure observed survival over time.
- Estimate LTV by summing gross profit over the cohort curve.
- Track churn drivers and reduce early churn (activation and onboarding).
Segmented lifetime planning
- Estimate lifetime separately for SMB vs enterprise; churn curves differ.
- Use product usage tiers to separate low-usage churn from power users.
- Recompute lifetime after pricing or packaging changes.
Lifetime data quality checks
- Use a consistent churn definition (logo vs revenue) across periods.
- Exclude paused or seasonal accounts if they are not true churn.
- Align churn measurement to the same billing period (monthly vs annual).