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fin.cohort-retention-ltv Calculator
Calculates cohort LTV from monthly retention data, and calculates LTV:CAC and payback period from acquisition cost. Cohort-based LTV is more accurate than formula-based LTV because it uses actual observed retention rather than an assumed churn rate.
Inputs
Month1 Retention Pct
Reference formula or conversion factor shown for context.
Monthly Churn Pct
Reference formula or conversion factor shown for context.
Arpu Monthly
Total income generated before any costs are deducted. Profitability depends on how much survives after expenses.
Cac
Reference formula or conversion factor shown for context.
Months
Reference formula or conversion factor shown for context.
Results
lifetime value LTV ($)
The computed numeric or monetary value.
LTV:CAC ratio
The proportional relationship between two quantities.
CAC payback (months)
The result expressed in months. Divide by 12 to convert to years.
LTV - CAC margin
LTV (customer lifetime value) -- total revenue expected from a customer over their entire relationship. Compare to CAC for unit economics.
healthy LTV:CAC
Overall health score or status — a composite measure of how well the system, asset, or metric is performing.
payback period target
Time to recover the initial investment from cumulative cash flows. Most firms target 2–5 years. Does not account for the time value of money — use discounted payback for rigour.