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fin.saas-unit-economics Calculator
Calculates SaaS unit economics — LTV, CAC, LTV:CAC, and CAC payback — from ARPU, churn, gross margin, and acquisition cost. SaaS unit economics are the investor's lens on whether a growth model is fundamentally sound — the metrics reveal sustainability before scale.
Inputs
Monthly Recurring Revenue
Total income generated before any costs are deducted. Profitability depends on how much survives after expenses.
Customer Count
Reference formula or conversion factor shown for context.
Monthly Churn Pct
Amount per unit of time or per unit quantity. Check the denominator before interpreting.
Cac Dollars
Reference formula or conversion factor shown for context.
Gross Margin Pct
Profit as a percentage of revenue. Margin % is always lower than markup % — a $5 profit on a $15 selling price is 33% margin but 50% markup.
Results
LTV (lifetime value)
The computed numeric or monetary value.
LTV:CAC ratio
The proportional relationship between two quantities.
ARPU (avg revenue per user)
Sample size or count used in the calculation.
payback period (months)
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.
LTV:CAC benchmark
Reference value for comparison — the industry standard, historical average, or target that this result is measured against.