Life Decision Calculators
The biggest financial decisions in life — buying a car, paying off student loans, saving for college, claiming Social Security, or planning early retirement — each involve tens or hundreds of thousands of dollars. Getting these right can save you a fortune; getting them wrong is expensive and hard to undo. Our life decision calculators model each scenario with the variables that actually matter: interest rates, tax implications, opportunity costs, and time horizons. These are the same analyses that financial advisors charge hundreds of dollars per hour to provide. Run them yourself, in your browser, for free — and make decisions backed by real numbers instead of rules of thumb.
Getting Started
Pick the tool that matches your next major decision. If you are car shopping, the Lease vs Buy calculator shows the true cost of each path over your expected ownership period. For retirement planning, the FIRE Calculator models how much you need to save and invest to reach financial independence at your target age. The Social Security optimizer is essential for anyone within 10 years of claiming age — the difference between claiming strategies can exceed $100,000 in lifetime benefits.
Frequently Asked Questions
How much can optimizing Social Security claiming be worth?
For married couples, the difference between optimal and suboptimal claiming strategies can exceed $100,000 in lifetime benefits. The calculator models different ages and spousal strategies to find the best approach for your situation.
Does the FIRE calculator account for taxes?
Yes. It models tax-advantaged accounts (401k, IRA, Roth) alongside taxable investments and estimates your effective tax rate in retirement to give a realistic savings target.
Is leasing or buying a car always better?
Neither is universally better. The answer depends on your driving habits, how long you keep vehicles, interest rates, and tax situation. Our calculator shows the exact breakeven point for your specific scenario.
Can the student loan tool compare repayment plans?
Yes. It compares standard, graduated, extended, and income-driven repayment plans side by side, including total interest paid and potential loan forgiveness under PSLF or IDR forgiveness programs.