🔄SaaS Metrics Calculator

About this tool

Enter the month's starting customers and MRR, new, churned, expansion and contraction MRR, sales and marketing spend and gross margin. The dashboard shows end MRR and ARR, growth, ARPA, customer and revenue churn, net revenue retention, LTV, CAC, the LTV:CAC ratio and the months of margin needed to pay back a new customer, with benchmark colouring.

The metrics investors and operators ask for

Subscription businesses live on a handful of numbers. Monthly recurring revenue and its growth say how big and how fast; customer churn (customers lost ÷ customers at the start) and revenue churn (lost plus downgraded MRR ÷ starting MRR) say how leaky; net revenue retention says whether existing customers grow — above 100% means expansion outweighs churn, the hallmark of the best SaaS companies. Lifetime value here is ARPA × gross margin ÷ monthly churn, CAC is sales and marketing spend ÷ new customers, and the classic health checks are LTV:CAC of at least 3:1 and CAC payback under 12 months. Honest notes: one month is noisy, so average a quarter; an LTV built on an unusually low churn month is wildly optimistic; and companies define these slightly differently, so state your formulas in a board deck. The startup runway calculator turns the revenue line into months of cash, the subscription tracker shows the customer's side of a recurring bill, the A/B test calculator checks pricing experiments, and the break-even calculator covers the fixed costs.

Frequently asked questions