The startup toolkit
founders & employees actually use.
Calculators for the boring-but-critical stuff: comp, equity, runway, valuation. No signups, no PDFs sent to your email, no upsell.
Compensation
06Salary & Tax Calculator
Gross → net take-home across US federal + state brackets.
Equity Vesting Schedule
4-year, 1-year cliff. See what's vested today.
Offer Comparison
Compare up to 3 job offers including equity value.
Contractor vs Employee Cost
True loaded cost: payroll tax, benefits, equipment.
Equity Offer Evaluator
% ownership × likely outcomes → expected $ value.
Salary Cost-of-Living Adjust
Adjust a US salary to another city's purchasing power.
Equity
06409A Valuation Estimator
Quick fair-market-value sanity check for common stock.
Cap Table Builder
Model founders, SAFEs, option pool & priced rounds.
SAFE → Equity Converter
Convert SAFEs at next priced round with caps & discounts.
Dilution Simulator
Project ownership through seed → Series C rounds.
Secondary Sale Tax
Tax on selling vested ISO / NSO / RSU shares.
QSBS Eligibility Checker
Section 1202 — are your gains tax-free up to $10M?
Finance
05Runway & Burn
How many months you have. With MRR growth assumptions.
SaaS Metrics
LTV, CAC, payback period & gross margin in one shot.
ARR Forecaster
Project ARR from new, expansion & churn cohorts.
Rule of 40 Checker
Growth rate + profit margin = SaaS health score.
Break-even Calculator
Fixed + variable costs → break-even units & revenue.
Legal & Ops
04Delaware Franchise Tax
Authorized shares vs assumed par value — pick the cheaper.
Stripe Fee Calculator
Net after card, cross-border & payout fees.
Incorporation Cost Compare
DE C-corp vs LLC vs S-corp — fees & filings.
R&D Tax Credit Estimator
Section 41 federal credit on engineering payroll.
Joiners
05What's My Equity Worth?
Model what your startup shares could be worth across exit scenarios.
ISO Exercise & AMT
Tax hit when you exercise incentive stock options — bargain element + AMT.
Startup vs Big Tech Offer
4-year total comp: startup equity upside vs guaranteed RSUs.
Employee Exit Waterfall
After liquidation preferences, how much do you actually take home?
Employee Equity Decoder
Decode your startup equity offer in plain English — options, vesting, 409A, risks & questions to ask HR.