Free Tools /Finance
SaaS Metrics Calculator (LTV, CAC, Payback)
From MRR, customers, churn, margin and CAC: get ARR, ARPU, LTV, LTV:CAC, CAC payback and an estimated NRR, with a read-out.
- Free, no signup
- Runs in your browser
- Nothing stored
Calculating…
Who uses it, and for what
Prepare the unit economics slide for investors in five minutes.
Check whether a CAC increase still keeps payback under 12 months.
See how much a 1-point churn drop is worth in lifetime value.
How this tool works
Lifetime from churn
Average lifetime is 1 ÷ monthly churn.
LTV on gross margin
ARPU × gross margin ÷ churn, the conservative and most common definition.
Benchmarks as rules of thumb
LTV:CAC of 3:1 or better and payback under 12 months are common targets, not laws.
Frequently asked questions
Should LTV use revenue or gross margin?
Gross margin. Revenue-based LTV overstates what a customer is worth.
What is a good LTV:CAC?
Around 3:1 is the usual benchmark. Much higher can mean you are under-investing in growth.
How is NRR estimated here?
From monthly expansion minus churn, annualised. Use your real cohort data when you have it.
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