Transparent, versioned formulas
Every metric ships with its formula, default inputs, and a version tag. Pin to a version (?v=v1) for reproducibility — we never silently change a formula on a saved scenario or board book.
Methodology
Transparent formulas, explicit assumptions, versioned definitions.
CACulator.io starts with broadly accepted SaaS metric definitions and keeps benchmark guidance conservative until opt-in cohorts are sufficiently dense. Premium board-book AI drafting is grounded in the metric snapshots you provide, with the evidence shown before generation.
AI grounded in your numbers, not invented
Board Book AI draft prompts use only the inputs, outputs, and metric snapshots you provide. The model is instructed to refuse fabricated numbers and we show the evidence sent to the model before generation.
Three benchmark layers — never mixed
Public SaaS guidance (curated research), CACulator anonymized participant cohorts (opt-in, k≥10), and investor firm internal portfolio rollups (your portcos only). Individual companies are never shown in cohort views.
Benchmarks opt-in, anonymized, and threshold-gated
Participant cohort bands (p25 / p50 / p75) appear only after a sample threshold is met. Below threshold, we fall back to curated public guidance with the source noted on each card.
Board books reflect data you entered or imported
Metric snapshots in a board book come from manual entry, CSV import, or a saved scenario today. Read-only Stripe Connect sync is coming soon. Outputs should always be reviewed by the founder or operator before sending.
Not financial, investment, or accounting advice
Calculator outputs, AI explanations, and board narrative are decision support — not advice. Verify formulas, inputs, and assumptions before reporting to your board or investors.
Formula library
Browse the full set of formula definitions and version tags below. Need the canonical source code? See the public formula repo.
Customer Acquisition Cost Calculator
v1CAC = Sales and marketing spend / New customers acquired
Calculate blended CAC from acquisition spend and new customer volume.
CAC Payback Calculator
v1CAC payback = CAC / (ARPA * Gross margin)
Estimate how many months it takes to recover CAC from gross profit.
LTV / CLTV Calculator
v1LTV = ARPA * Gross margin / Monthly churn rate
Estimate gross-profit lifetime value using ARPA, margin, and churn.
LTV:CAC Ratio Calculator
v1LTV:CAC = LTV / CAC
Compare lifetime value to acquisition cost to judge acquisition efficiency.
Net Revenue Retention Calculator
v1NRR = (Beginning revenue - churn - contraction + expansion) / Beginning revenue * 100
Measure retained and expanded recurring revenue from an existing cohort.
Gross Revenue Retention Calculator
v1GRR = (Beginning revenue - churn - contraction) / Beginning revenue * 100
Measure retained recurring revenue before expansion offsets losses.
SaaS Churn Calculator
v1Logo churn = Churned customers / Starting customers; gross revenue churn = lost MRR / starting MRR
Calculate logo churn, gross revenue churn, and net revenue churn together.
ARR / MRR / ARPA / ACV Calculator
v1ARR = MRR * 12; ARPA = MRR / paying accounts; ACV = annual contract value / annual contracts
Normalize core recurring revenue metrics for SaaS reporting.
Rule of 40 Calculator
v1Rule of 40 = Revenue growth % + EBITDA margin %
Combine growth and profitability into the classic SaaS operating balance score.
SaaS Magic Number Calculator
v1Magic Number = (Current quarter ARR - Prior quarter ARR) / Prior quarter sales and marketing spend
Estimate sales and marketing efficiency from the ARR created by the previous quarter's spend.
Burn Multiple Calculator
v1Burn multiple = Net burn / Net new ARR
Measure how many dollars of burn are required to create each dollar of net new ARR.
SaaS Quick Ratio Calculator
v1Quick ratio = (New MRR + Expansion MRR) / (Churned MRR + Contraction MRR)
Compare new and expansion revenue against churn and contraction drag.
Rule of X Calculator
v1Rule of X = (Revenue growth % × growth weight) + Free cash flow margin %
Weight growth against free cash flow margin for later-stage SaaS valuation discipline.
Net New ARR Calculator
v1Net new ARR = New ARR + Expansion ARR - Churned ARR - Contraction ARR
Break ARR creation into new, expansion, churn, and contraction components.
Runway and Scenario Calculator
v1Runway (months) = Cash on hand / Monthly net burn
Estimate months of runway from cash, revenue, and operating expenses. Toggle scenarios for hiring or growth assumptions.
Pipeline Coverage Calculator
v1Pipeline coverage = Qualified pipeline / Revenue target
Estimate whether qualified pipeline is sufficient for a revenue target.
Sales Velocity Calculator
v1Sales velocity = Opportunities × Average deal size × Win rate / Sales cycle days
Calculate expected revenue throughput per day across a sales pipeline.
Win Rate Calculator
v1Win rate = Won deals / Total closed deals × 100
Measure closed-won efficiency from closed opportunity volume.
GTM Efficiency Score Calculator
v1GTM efficiency = (Net new ARR / Sales and marketing spend) × NRR × Gross margin
Blend acquisition efficiency, retention quality, and margin into one operating score.