Subscription Unit Economics Calculator

How to use Subscription Unit Economics Calculator

CAC=spend/new customers. Modeled gross-profit LTV=monthly ARPU×margin/monthly churn. Payback divides CAC by monthly contribution.

1. Enter acquisition spending, new attributed customers, monthly arpu, gross margin (0–1), monthly customer churn (0–1).
2. Check the model, units, and supported limits before calculating.
3. Run the tool, inspect the result, then copy or download it.

Good to know

• Use matched attributed cohorts and months. Margin/churn are 0–1. Zero churn or contribution gives undefined modeled metrics, not guaranteed infinite value.
• Runs locally. Numeric inputs are bounded; floating-point output is approximate and rounded to 12 significant digits. Unsupported or non-finite calculations produce an error.
• Educational user-assumption arithmetic only. No live rates, tax rules, financial advice, or outcome guarantees.