FIRE Calculator (Financial Independence, Retire Early)
Calculate your target portfolio size based on the Trinity Study's 4% rule, and estimate how many years you need to achieve financial freedom.
Total portfolio required to sustain your lifestyle indefinitely
Based on current savings and expected investment growth
Permitted monthly withdrawal without touching capital principal
Portfolio Progression & Milestone Roadmap
Year-by-year compounding simulation| Year | Starting Balance | Annual Investment | Market Growth | End of Year Balance | FIRE Progress |
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Understanding the FIRE Movement and the 4% Rule
The FIRE (Financial Independence, Retire Early) methodology focuses on aggressive saving and long-term index investing to gain complete freedom over personal time. Rather than relying on traditional pension ages, FIRE practitioners build a self-sustaining asset pool capable of generating passive returns that exceed regular living overhead.
The Core Math: The 25x Principle
Most early retirement models trace back to the landmark Trinity Study, which introduced the concept of the Safe Withdrawal Rate (SWR). When relying on a conservative 4% withdrawal rate, your target capital equates to precisely 25 times your annual living expenses:
FIRE Target Portfolio = Annual Living Expenses / Safe Withdrawal Rate
Example: If your household spends $40,000 annually, $40,000 ÷ 0.04 = $1,000,000.
Popular Variations of the FIRE Strategy
- Lean FIRE: Living on a strict, minimalist budget (typically under $30,000–$40,000/year) to achieve early retirement in a compressed timeframe.
- Fat FIRE: Aiming for an affluent post-retirement lifestyle ($100,000+/year) requiring a significantly larger nest egg.
- Barista / Coast FIRE: Accumulating enough invested capital early so that compound interest handles full retirement, while taking a low-stress or part-time job solely to cover immediate living bills.