Lean FIRE Calculator

Lean FIRE is a frugal variant of financial independence and early retirement that targets a bare-bones or minimalist annual budget, typically under $40,000 per year or $3,333 per month for an individual or couple in a low cost-of-living area. Because the target spending is lower, the required portfolio (25x annual expenses) is smaller and can be reached faster than Fat FIRE or standard FIRE.

Lean FIRE is commonly defined as living on $25,000 to $40,000 per year (individual or couple), depending on location and lifestyle. This typically means geographic arbitrage (living in a low cost-of-living city or country), owning rather than renting, minimal discretionary spending, home cooking, minimal travel, and DIY approaches to maintenance and healthcare management.

Lean FIRE carries more sequence-of-returns risk, healthcare cost risk, and lifestyle risk than Fat FIRE. With minimal cushion above essential expenses, a market downturn, unexpected medical bill, or cost-of-living increase can cause financial stress. Most Lean FIRE practitioners maintain a side income buffer, build a large emergency fund, and remain flexible about returning to work if needed.

Lean FIRE targets complete financial independence at a minimal spending level, with no work income required. BaristaFIRE targets partial financial independence: a small portfolio covers some expenses, while part-time low-stress work (like a barista job) covers the rest, often including employer health insurance. BaristaFIRE requires less capital but involves ongoing part-time work.

That depends on your values and risk tolerance. Lean FIRE offers earlier freedom at the cost of a tighter budget and less financial cushion. A larger portfolio at standard or Fat FIRE levels provides more flexibility, better ability to handle emergencies, and greater freedom to increase spending if desired. Many people aim for Lean FIRE with the intention of letting the portfolio grow further before increasing spending.