Lean FIRE Calculator
Minimalist retirement budget · Updated 2026
What Is Lean FIRE?
Lean FIRE is achieving financial independence on a minimalist budget — typically under $25,000/year for a single person or $40,000 for a couple. It appeals to those who value freedom over consumption and are willing to live frugally to escape the workforce sooner.
At $20,000 annual expenses and a 4% withdrawal rate, your lean FIRE number is just $500,000. Compare that to traditional FIRE at $1,000,000 (for $40K expenses) — lean FIRE cuts your target in half.
| Annual Expenses | Monthly Budget | FIRE Number |
|---|---|---|
| $15,000 | $1,250/mo | $375,000 |
| $20,000 | $1,667/mo | $500,000 |
| $25,000 | $2,083/mo | $625,000 |
| $30,000 | $2,500/mo | $750,000 |
Frequently Asked Questions
How is lean fire calculator calculated?
The formula is: Annual Expenses ÷ Withdrawal Rate. Enter your values above and click Calculate to see your personalized result instantly. Lean FIRE targets a modest retirement lifestyle with minimal expenses — typically under $40,000 per year for a household. Your Lean FIRE number = Annual Expenses × 25. This approach trades material…
What inputs do I need for the lean fire calculator?
You need: Expenses, Withdrawal Rate. Default values are pre-filled — adjust them to match your personal finances for a customized result.
Is the lean fire calculator free to use?
Yes — all TorchFI calculators are completely free. No registration, no email required. Calculations run entirely in your browser for maximum privacy. We never see or store your financial data.
How does the lean fire calculator help with FIRE planning?
Calculate your FIRE number based on a minimalist lifestyle and lean budget. Ideal for those pursuing frugal early retirement with lower annual expenses. This calculator helps you make data-driven decisions about your financial independence journey instead of relying on guesswork.