FIRE Calculator: Master Financial Independence & Retire Early

What is the FIRE Number and How is it Calculated?

Your FIRE Number is the target portfolio value required to sustain your lifestyle indefinitely without ever needing employment income. Originating from the landmark Trinity Study, the classic formula multiplies your annual living expenses by 25:

FIRE Number = Annual Living Expenses × 25

For instance, if your household spends $60,000 annually, your baseline FIRE Number is $1,500,000. Withdrawing 4% annually adjusted for inflation preserves your portfolio across decades.

Understanding the Five Primary FIRE Tiers

• Lean FIRE: A minimalist path covering roughly 75% of baseline costs. Perfect for location-independent individuals who value time freedom over luxury.
• Standard FIRE: Replaces 100% of current living expenses, providing uncompromised comfort throughout retirement.
• Fat FIRE: Targets 135%+ of baseline expenses, affording frequent travel, high-end healthcare, and generous discretionary spending.
• Barista FIRE: Accumulates 50% of the target nest egg, letting you work enjoyable part-time or seasonal jobs for healthcare benefits.
• Coast FIRE: Investing heavily in your 20s and early 30s until compound growth alone will reach your FIRE goal at traditional retirement without another cent invested.

The Fisher Equation & Factoring Inflation into Wealth Curves

Failing to account for purchasing power erosion is fatal to long-term projections. The exact real rate of return is governed by the Fisher Equation:

1 + r = (1 + i) / (1 + π)

where r is the real rate, i is the nominal return, and π represents inflation. Sayd's interactive FIRE engine handles this math automatically in real time.

Frequently Asked Questions (FAQ)