Can I Afford This Life? Simulator
Stress-test holistic life decisions: buying a home, having children, taking a career break or sabbatical, salary changes, and vehicle upgrades over a 10-year projection.
Launch Life Scenario Model →Calculate smarter. Plan better.
Interactive decision models to test assumptions, compare scenarios, and make major financial decisions with clarity. Free, fast, private, and calculated instantly in your browser.
Financial Decision Models & Simulators
Mortgage Calculator & Amortization
Calculate monthly payments, interest vs. principal breakdown, full amortization schedules, property taxes, PMI, homeowners insurance, and analyze how extra monthly or lump-sum payments accelerate your payoff date.
Launch Mortgage Model →Retirement & FIRE Calculator
Forecast portfolio growth, safe withdrawal rates, inflation-adjusted spending, and run Monte Carlo simulations for retirement success probability across different asset allocations.
Launch Retirement Model →Investment Growth & Compound Interest
Simulate long-term compound interest, periodic contribution increases, fee drag, expense ratios, dividend reinvestment, and realistic inflation-adjusted wealth outcomes.
Launch Investment Model →Rent vs. Buy Analyzer
Compare total wealth accumulation over your time horizon. Account for equity growth, property taxes, maintenance, rent inflation, and the opportunity cost of down payments invested in index funds.
Launch Rent vs Buy Model →Debt Payoff (Avalanche & Snowball)
Manage multiple credit cards, student loans, and auto loans. Visualize exact debt-free dates and compare interest saved between the Debt Avalanche (highest interest first) and Debt Snowball (lowest balance first) strategies.
Launch Debt Payoff Model →Net Worth Tracker & Milestone Projector
Aggregate cash, liquid investments, real estate equity, and liabilities to model multi-year net worth trajectory and estimate financial freedom milestones.
Launch Net Worth Model →Car Purchase vs. Lease Calculator
Analyze the true total cost of ownership (TCO) comparing new vs used car financing against leasing, including depreciation curves, insurance, maintenance, and residual values.
Launch Car Cost Model →Career & Lifetime Earnings Simulator
Compare two career paths side-by-side, evaluating annual salary raises, performance bonuses, equity / RSU vesting schedules, and the compound impact of job changes over your lifetime.
Launch Career Model →Rental Property ROI & Cash Flow
Evaluate real estate investments with detailed cash flow breakdowns, Cap Rate, Cash-on-Cash Return (CoC), Internal Rate of Return (IRR), and rent sensitivity matrices.
Launch Rental ROI Model →Startup Runway & Burn Rate Model
Simulate startup financial runway, revenue growth, customer acquisition costs, churn rates, scheduled future hires, and break-even milestones.
Launch Startup Runway Model →Why Use whatifmoney.ai?
Instant Real-Time Math
Every calculation updates dynamically as you adjust sliders and inputs, giving immediate clarity on complex compound scenarios.
100% Client-Side Privacy
Your financial numbers never leave your browser. No mandatory accounts, no server tracking of your net worth, debts, or income.
Scenario Comparison
Test "What If" questions side-by-side: what if interest rates drop, what if you make extra mortgage payments, or what if you retire 5 years earlier?
Frequently Asked Questions
- Are the financial calculators on whatifmoney.ai free to use?
- Yes. All core financial simulators—including Mortgage, Retirement / FIRE, Investment Growth, Rent vs Buy, and Debt Payoff—are completely free with no paywall.
- Is my financial data stored on your servers?
- No. All financial calculations run locally in your web browser. We do not store or transmit your financial inputs to external databases.
- How does the Rent vs. Buy calculator determine breakeven?
- The model compares the total net wealth of buying (home equity minus interest, taxes, maintenance, and buying/selling friction) versus renting and investing the difference (down payment and monthly savings in broad market index funds).