SaaS Metrics Calculator
Turn four numbers into the metrics investors ask about — LTV, LTV:CAC, CAC payback, MRR and ARR. Everything runs in your browser.
ARPU — what one customer pays you per month.
Share of customers who cancel each month.
What you spend to win one customer.
Revenue left after serving the customer.
Optional — used to compute MRR & ARR.
LTV (per customer)
—
margin-adjusted
LTV : CAC
—
add CAC
CAC payback
—
add CAC
Avg lifetime
—
add churn
MRR
—
add customers
ARR
—
MRR × 12
Enter at least ARPU and churn to see your LTV.
SaaS metrics — frequently asked
What is a healthy LTV:CAC ratio?
Roughly 3:1 is the classic benchmark — you earn back three times what you spend to acquire a customer. Below 1:1 you lose money on every customer; above 5:1 you may be under-investing in growth.
How is customer lifetime calculated?
Average lifetime (in months) ≈ 1 ÷ monthly churn rate. A 4% monthly churn implies an average lifetime of ~25 months. It is an estimate — real cohorts vary — but it is the standard back-of-envelope model.
How is LTV calculated here?
LTV = ARPU × gross margin × average lifetime. Multiplying by gross margin gives a margin-adjusted LTV, which is more honest than revenue-only LTV because it reflects what actually reaches your bottom line.
What is CAC payback?
The number of months of margin-adjusted revenue it takes to recover the cost of acquiring a customer. Under 12 months is generally considered efficient for early-stage SaaS.
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