Coast Fire Calculator
Calculate the amount you need to invest today to reach your retirement goal without additional contributions, based on the Coast FIRE concept.
Published by:
isCalculator Editorial Team
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How to use this tool?
This calculator determines the lump sum you need today to reach financial independence (FIRE) without making any additional contributions. Here's how to use it:
- Enter your current age (e.g., 30). Must be between 0 and 120.
- Enter your target retirement age (e.g., 65). Must be greater than your current age.
- Enter your expected annual spending at retirement (e.g., $40,000). This is how much you'll need per year in retirement.
- Enter your expected annual return rate (e.g., 7%). This is the growth rate of your investments before retirement.
- Enter your safe withdrawal rate (e.g., 4%). The standard is 4%, but you can adjust.
- Enter your current savings (optional, e.g., $50,000). This subtracts from the lump sum needed.
- Click "Calculate Coast Fire Number" to see the result.
What you get: The calculator shows the lump sum needed today (Coast Fire Number) and a step-by-step breakdown of the math. If you already have savings, it also shows how much additional you need.
Note: All monetary values are in US dollars. Percentages are entered as whole numbers (e.g., 7 for 7%). The calculator assumes no additional contributions after today.
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Frequently Asked Questions
Coast FIRE is a financial independence strategy where you save a lump sum early in your career that, with compound growth, will grow to your FIRE number by retirement age without needing additional contributions.
First, calculate your FIRE Number (annual spending divided by safe withdrawal rate). Then discount it back to today using your expected annual return over the number of years until retirement.
The safe withdrawal rate is the percentage of your portfolio you can withdraw annually without running out of money, commonly 4% based on the Trinity Study.
