Coast FIRE Calc
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Coast FIRE Calc answers a specific question: if you stopped saving today, would your current nest egg grow enough to hit your retirement target? Input your current balance, target retirement balance, age, and expected annual investment return, and it shows you the math. For people exploring a Coast FIRE strategy, working part-time or downshifting to a lower-stress job while letting savings compound, this tool is the decision point. You can see at what point your investments have done "enough" that you no longer need to contribute.
Fits best if you're mid-career and considering a lifestyle change, or if you've hit a milestone savings number and want to know whether coast mode is viable. It's a narrow tool (does one thing well) rather than a multi-purpose FIRE planner, but that focus is exactly what you need to model this specific retirement flavor.