boardfluent-saas-calculators

Dependency-free TypeScript library of SaaS metric calculators.

This is the open, deterministic layer beneath BoardFluent, the SaaS board-meeting platform. The benchmark data, premium calculators, and AI-driven GTM Diagnostic stay private in the product. Every formula here is a pure function with no network calls, no state, and no dependencies outside the TypeScript standard library. You can read the source, verify the math, and trust the output.

Calculators

Core Financial and Profitability

1. ruleOf40 -- growth rate + profit margin
2. ruleOfX -- weighted growth rate + FCF margin
3. grossMargin -- gross profit and margin from revenue and COGS
4. ebitdaMargin -- EBITDA / revenue
5. fcfMargin -- free cash flow / revenue
6. revenueGrowth -- year-over-year or period-over-period growth rate
7. revenuePerEmployee -- revenue / FTE headcount
8. burnMultiple -- net burn / net new ARR
9. runway -- months of cash runway at current burn
10. quickRatio -- (new MRR + expansion MRR) / (churned MRR + contraction MRR)

SaaS Revenue and Retention

11. arrFromMrr, mrrFromArr, arpa -- recurring revenue conversions and average revenue per account
12. nrr -- net revenue retention
13. grr -- gross revenue retention
14. logoChurn, grossRevenueChurn, netRevenueChurn -- logo and revenue churn rates
15. netNewArr -- net new ARR from all four ARR movements
16. cac -- customer acquisition cost
17. cacPayback -- CAC payback period in months
18. ltv -- customer lifetime value
19. ltvToCac -- LTV to CAC ratio
20. magicNumber -- net new ARR / prior-period S&M spend

GTM and Sales Efficiency

21. salesCapacity -- realistic bookings capacity from ramped AEs
22. rampedQuotaCoverage -- ramped capacity / bookings plan

Pricing and GTM Diagnostic

23. topSegmentShare, herfindahlIndex -- revenue concentration by segment
24. coverage, topIntegrationAttachRate -- integration coverage and attach rate
25. priceRealization -- realized ARPA / list ARPA
26. discountWaterfall -- average discount from list to realized price

Installation

npm install boardfluent-saas-calculators

Usage

import { ruleOf40, cacPayback } from "boardfluent-saas-calculators";

// Rule of 40: growth rate + profit margin (both as decimals)
const score = ruleOf40({ growthRate: 0.42, profitMargin: 0.08 });
console.log(score); // 0.50 (50 -- above the 40-point threshold)

// CAC payback in months
const paybackMonths = cacPayback({
  cac: 12_000,       // cost to acquire one customer
  arpa: 1_000,       // monthly revenue per account
  grossMargin: 0.78, // 78% gross margin
});
console.log(paybackMonths); // ~15.4 months

Every formula carries a JSDoc comment with its definition, where teams commonly get it wrong, and a healthy range by company stage. You can trust the number without taking my word for it.

License

MIT

Who built this

Mike Dayton. Two decades leading revenue as a CRO, CSO, and GM at PE-backed, public, and founder-led B2B software companies, plus one company founded and sold. I build BoardFluent, the SaaS board-meeting platform these calculators come from.

If a number here raises a question you want an operator's read on, I work with SaaS founders and boards on GTM diagnostics and advisory. More at https://boardfluent.com.