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SaaS unit economics calculator

Enter spend, customers, ARPA, margin, and churn to get CAC, margin-adjusted LTV, the LTV to CAC ratio, payback months, and a sensitivity table.

Enter spend, customers, ARPA, margin, and churn to price a customer.

Churn here is monthly revenue churn, so lifetime is 100 divided by it; logo churn, expansion revenue, and discounting are not modeled. A ratio under 1 loses money on every customer. A ratio of 3 to 1 is convention, not a rule, and a good ratio with a long payback can still starve cash: compare payback months against your runway before celebrating the ratio.
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