The FI Calculator
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The FI Calculator addresses the specific needs of people pursuing financial independence and early retirement. It runs Monte Carlo simulations against historical market data from 1928 onward to show the probability of your plan succeeding across different time periods. Coast FIRE mode calculates how long you'd need to work if you stopped saving and let compound growth reach your FI target.
The tool emphasizes transparency on how spending decisions affect your path to independence, showing exactly how much each dollar of additional spending delays your target date. It fits the FIRE community's preference for mathematical rigor and detailed outcome forecasting.