SaaS Metrics Calculator
The seven numbers every board deck gets asked about — unit economics, efficiency, and burn — computed live from eight inputs. Nothing leaves your browser.
Formulas, stated plainly
LTV = ARPA × gross margin ÷ monthly churn. CAC = S&M spend ÷ new customers. Payback = CAC ÷ (ARPA × gross margin), in months. Rule of 40 = YoY growth % + FCF margin %. Magic Number = net new ARR ÷ S&M spend (same quarter). Every one of these has variants — this tool uses the simplest common form and shows its work so you can argue with it.
Frequently asked questions
What does the SaaS Metrics Calculator compute?
Six standard operating metrics from eight inputs: customer lifetime value (LTV), customer acquisition cost (CAC), LTV:CAC ratio, CAC payback in months, Rule of 40, and Magic Number. Each result shows the formula behind it and a plain-language read of whether the value is healthy by common convention.
Which formula variants does it use?
The simplest common forms: LTV = ARPA × gross margin ÷ monthly churn; CAC = sales & marketing spend ÷ new customers; Rule of 40 = YoY growth % + free-cash-flow margin %; Magic Number = net new ARR ÷ same-quarter S&M. Every metric has variants (fully-loaded vs marketing-only CAC, GAAP vs non-GAAP margins) — the formulas are stated on-page so you can disagree precisely.
Who is this for?
Operators sanity-checking a board deck, investors triaging a metrics slide, and anyone who wants the standard SaaS efficiency math without opening a spreadsheet. Numbers never leave the browser, so it's safe for non-public figures.