Free SaaS tool
SaaS Metrics Calculator (MRR, ARR, LTV, CAC)
Calculate MRR, ARR, customer lifetime, LTV, LTV:CAC ratio and CAC payback period from five inputs.
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Frequently asked questions
What is a good LTV:CAC ratio?
A common benchmark is 3:1 or better — each customer brings in at least three times what it cost to acquire them. Below 1:1 you lose money on every customer.
How is LTV calculated here?
LTV = ARPA × gross margin ÷ monthly churn rate. It is a simple steady-state estimate; cohort data gives a more precise picture.
What is CAC payback?
The number of months of gross-margin revenue needed to recover the cost of acquiring a customer. Under 12 months is generally considered healthy.