CAC LTV Payback Calculator
Free SaaS calculator for customer LTV, LTV:CAC ratio, and CAC payback in months. Margin-adjusted formulas, sensitivit...
What CAC LTV Payback Calculator does
The TrafficLoopback CAC LTV Payback Calculator is a free SaaS unit economics tool that computes customer lifetime value (LTV), customer acquisition cost (CAC), the LTV to CAC ratio, and the CAC payback period in months. It uses a margin-adjusted LTV formula — (ARPU × gross margin) / monthly churn — that investors and operators reference, and it also shows the unadjusted LTV for comparison. Beyond the core numbers, the calculator provides a health check against industry benchmarks, a sensitivity chart showing how LTV:CAC and payback shift with changes in ARPU or CAC, and currency flexibility for USD, EUR, GBP, CAD, and AUD. The result page includes a verdict label (e.g., "Healthy — solid SaaS unit economics") and a "What if?" section that lets users model scenarios by adjusting ARPU or CAC while holding churn and margin constant.
How to use the TrafficLoopback CAC LTV Payback Calculator
- 1
Enter your SaaS unit economics: monthly ARPU, gross margin percentage, monthly churn rate, and fully-loaded CAC
- 2
Optionally set a discount rate (annual) for NPV-adjusted LTV and select your preferred currency
- 3
The calculator instantly displays LTV (margin-adjusted and without margin), the LTV:CAC ratio, CAC payback period in months, and a health verdict
- 4
Review the sensitivity chart to see how LTV:CAC and payback change with churn, ARPU, or CAC adjustments
- 5
Use the "What if?" scenario builder to model the impact of raising ARPU or lowering CAC while keeping other variables constant
Best for
Early-stage and growing SaaS founders, product managers, and operators who need a quick, margin-adjusted snapshot of unit economics to assess profitability, compare against benchmarks, and model growth scenarios without a spreadsheet.
Limitations
- Designed for SaaS subscription models; not suitable for one-time purchase or non-recurring revenue businesses
- Relies on user-entered inputs; accuracy depends on correct gross margin and churn estimates
- Payback period and ratio are estimates based on the formulas provided and may not reflect all business-specific cost factors
CAC LTV Payback Calculator FAQ
- What is the difference between the margin-adjusted LTV and the unadjusted LTV shown by the calculator?
- The margin-adjusted LTV uses the standard formula (ARPU × gross margin) / monthly churn, reflecting revenue after delivery costs, while the unadjusted LTV is calculated as ARPU / monthly churn, representing total revenue before margin deductions.
- What is considered a healthy LTV:CAC ratio for a SaaS business?
- The tool flags a ratio of 3:1 or better as healthy, with best-in-class performance noted at 5:1 or higher, and a verdict of "Healthy — solid SaaS unit economics" when the ratio meets that benchmark.
- How does the sensitivity chart help me understand my unit economics?
- The sensitivity chart shows how LTV:CAC and payback period shift as monthly churn changes, illustrating that even a one-point reduction in churn can dramatically improve your ratio, and it also lets you model the impact of raising ARPU or lowering CAC while holding other variables constant.
- Can I use this calculator for businesses outside of SaaS subscription models?
- No, the calculator is designed for SaaS subscription businesses that have monthly recurring revenue, a defined churn rate, and a gross margin after delivery costs. It is not appropriate for one-time purchase or non-recurring revenue models.