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A growing collection of calculators and references for founders and investors. No signup, no email gate, URL-shareable results, CC BY 4.0. Each tool is self-contained and runs entirely in your browser.
Financing math
Post-money SAFE conversion math
Model YC 2018+ post-money SAFE conversion under both the valuation cap and the discount. Compare effective ownership at the next priced round. Share calculations via URL.
Financial planning
Cash, burn, headcount scenarios
How many months of runway do you have? Cash divided by net burn, with the option to model adding engineers at loaded cost. Fundraise-timing bands built in. URL-shareable.
SaaS metrics
SaaS capital efficiency
Total burn divided by net new ARR, classified into the David Sacks bands (exceptional / great / OK / suspect / bad). The single-number readout SaaS investors run during diligence. URL-shareable.
SaaS metrics
SaaS sales efficiency
Annualized net new ARR divided by quarterly S&M spend, classified into the Bessemer / OpenView bands. Tells you whether the GTM motion is paying for itself. Companion to burn multiple.
SaaS metrics
Customer-acquisition-cost in months
CAC divided by monthly gross contribution (ARPC × GM%) gives you the per-customer payback in months. Standard bands (<6 exceptional / 6-12 great / 12-18 good / 18-24 OK / >24 bad). Completes the SaaS efficiency triad with burn multiple and magic number.
SaaS metrics
Customer lifetime value + LTV:CAC ratio
(ARPC/12) × gross margin × customer lifetime, with optional CAC input for the LTV:CAC ratio classified into industry-standard bands (>5× exceptional, 3-5× healthy, 2-3× OK, 1-2× suspect, <1× bad). The canonical SaaS unit-economics view.
Financing math
Multi-SAFE + Series A + option pool
Model up to 3 stacked post-money SAFEs converting at a priced Series A with an option pool refresh. See the final cap table and founder ownership %, with over-dilution warnings when inputs don't fit. The financing-math companion to the single-SAFE calculator.
SaaS metrics
SaaS growth efficiency
(New ARR + expansion) divided by (churned + contracted). The Kleiner Perkins / Mamoon Hamid heuristic for SaaS growth efficiency. Captures gross-flow dynamics that NDR compresses away. Completes the five-metric SaaS efficiency suite.
New tools ship roughly weekly. On the near-term list: an NDR calculator, a co-investor graph viewer, and a paste-a-GitHub-repo signal scorer. If there's a tool you want and don't see, the fastest way to ask is through the Sunday digest.
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