SaaS Metrics Calculator
Plug in your numbers to instantly see MRR, ARR, customer lifetime value, LTV:CAC, CAC payback and a 12-month revenue projection — the metrics investors and operators actually look at.
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Understanding your SaaS metrics
These are the core numbers that tell you whether a subscription business is healthy and how efficiently it turns marketing spend into durable revenue. Here's what each one means and how this calculator works them out.
MRR & ARR
Monthly Recurring Revenue (MRR) = customers × average revenue per customer. Annual Recurring Revenue (ARR) is simply MRR × 12 — your annualised run-rate at today's revenue.
Customer Lifetime Value (LTV)
LTV estimates the total gross profit a customer generates before they churn. We use the gross-margin-adjusted formula: LTV = (ARPU × gross margin) ÷ monthly churn rate. Adjusting for margin gives a truer picture than revenue alone, because servicing customers has a cost.
LTV : CAC ratio
This compares the value of a customer to what it costs to acquire one (CAC). A ratio of 3:1 or higher is generally considered healthy; below 1:1 means you lose money on every customer, and very high ratios can signal you're under-investing in growth.
CAC payback period
The number of months of gross profit needed to recoup the cost of acquiring a customer: CAC ÷ (ARPU × gross margin). Under 12 months is a common benchmark for efficient SaaS growth.
Churn & customer lifetime
Monthly churn is the share of customers you lose each month. Average customer lifetime ≈ 1 ÷ monthly churn. Small changes in churn have an outsized effect on LTV — which is exactly why reducing it is so valuable.
This tool runs entirely in your browser — nothing you type is sent anywhere. Figures are estimates to guide planning, not financial advice.