FIRE Calculator (Financial Independence, Retire Early)
Calculate your FIRE target number, Lean/Fat tiers, Coast metrics, and years to retirement.
Execution runs 100% locally inside the browser sandbox using HTML5 Canvas, Web Cryptography Subtle API, and Web Workers. No data is ever transmitted across the network.
Zero network latency. Operates completely offline with zero dependencies on third-party backend servers or cloud services.
Built according to official RFC specifications, cryptographic test vectors, and enterprise-grade data transformation standards.
How to Use FIRE Calculator (Financial Independence, Retire Early)
Enter your current age, existing investments, and annual household savings.
Specify desired annual living expenses and assumed investment growth rate (e.g. 7%).
View your Lean, Standard, and Fat FIRE targets alongside your exact retirement timeline.
Frequently Asked Questions
What is the 4% Safe Withdrawal Rate rule?
The 4% rule (from the Trinity Study) states that you can safely withdraw 4% of your investment portfolio annually, adjusted for inflation, with a high probability of never depleting principal over 30+ years.
What is the difference between Lean FIRE and Fat FIRE?
Lean FIRE covers basic essential living expenses (typically 75% of average budget), while Fat FIRE accommodates an abundant lifestyle with luxury travel and higher discretionary spending.
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