All 14 calculators. All free. No signup.
From savings rate to Roth conversion ladder — every standalone tool, organized by what you're trying to figure out.
Get the math under your feet.
House, debt, school, wedding.
When you're close enough to plan the exit.
Combined effects need a simulator.
These calculators model one decision in isolation. Buying a house and converting Roths and reaching Coast FI happen at the same time in real life — and they affect each other. The simulator chains them together. Standalone calculators are great for understanding the levers; the simulator is for seeing how they interact.
Model your complete picture
The full simulator chains income, taxes, and life events year by year — and resolves how each decision ripples through the others.
About the calculators
Yes — all 14 calculators are free, with no signup required. They run client-side, so your inputs never leave your browser.
The FIRE Number tells you how much you need invested to retire (typically 25× annual expenses). Coast FI tells you whether your existing portfolio, left alone with no further contributions, will grow to your FIRE Number by your target age.
They model the standard formulas accurately within their assumptions. Real outcomes depend on factors the calculators simplify away — variable returns, tax pivots, life events. The full simulator handles those.
Calculator inputs are local to your browser session. To save and revisit, create a free profile — the simulator persists everything in your account.
Start with the FIRE Number Calculator (gives you a target), then Savings Rate (gives you a velocity), then Time to FI (gives you a date). For homeowners or near-retirees, the Roth Conversion Ladder is the highest-leverage tool.
Yes — every calculator is responsive. Sliders and inputs are sized for touch. We recommend landscape mode for the chart-heavy ones (Compound Interest, Coast FI).