AI & Strategy
Updated
AI Build vs Buy Break-Even Calculator
Calculate the exact financial break-even point where in-house AI engineering beats commercial LLM API SaaS subscription costs over multi-year horizons.
Projects Hub
Interactive tools, calculators, frameworks, and models by Ross Rondeau.
Money & Decisions
Updated
Car Buy vs Lease Planner
Compare paying cash, financing, and leasing across the hold length you actually intend, in present value terms, net of what the car is worth when you are done with it.
Personal Finance
Updated
Retirement Coast & Milestone Calculator
Calculate your Coast FIRE milestone where compound investment growth fully funds your target retirement portfolio without requiring additional annual savings.
Productivity
Updated
Wasted Time & Inefficiency Cost Calculator
Quantify the true annual financial cost of recurring workplace interruptions, unproductive meetings, and long commutes based on your loaded hourly compensation.