FIRE Calculator
FIRE Variants
| Target | Years | |
|---|---|---|
| Lean FIRE (60%) | $750K | 13.3 |
| Regular FIRE | $1.3M | 18.5 |
| Fat FIRE (150%) | $1.9M | 23.2 |
What Is FIRE?
This interactive FIRE calculator models your path to financial independence and early retirement. FIRE stands for Financial Independence, Retire Early — a strategy built on one equation: save aggressively, invest wisely, and let compound growth build a portfolio large enough to cover your living expenses indefinitely. Your FIRE number equals your annual expenses divided by your safe withdrawal rate — typically 4%, meaning you need 25 times your annual spending.
The movement isn't about deprivation. It's about reaching the crossover point where investment income exceeds expenses, giving you the freedom to work on your own terms — or not at all.
Why Savings Rate Matters More Than Income
Your savings rate is the single most powerful variable in the FIRE equation. At a 10% savings rate, FIRE takes roughly 50 years. At 50%, about 17 years. At 75%, around 7 years. The math is powerful: every percentage point increase simultaneously grows your portfolio faster AND reduces your FIRE number, because lower expenses mean a lower target.
This is why a $60,000 earner saving 60% can reach FIRE faster than a $200,000 earner saving 10%. Income matters, but the ratio of saving to spending is what determines the timeline.
The 4% Rule: What It Really Means
The 4% rule comes from the 1998 Trinity Study, which found that a balanced portfolio (stocks + bonds) survived 30 years in 95% of historical periods at a 4% initial withdrawal rate, adjusted for inflation each year after. For early retirees with 40-60 year horizons, a more conservative 3.25-3.5% rate provides additional safety margin.
The rule isn't a guarantee — it's a historically tested guideline. Flexible spending (reducing withdrawals 10-20% during bear markets) and maintaining some earned income in early retirement dramatically improve portfolio survival rates.
Coast FIRE: The Halfway Milestone
Coast FIRE means you've saved enough that compound growth alone — with zero additional contributions — will reach your FIRE number by age 65. Once you hit this milestone, you only need to earn enough to cover current expenses, freeing you to work less, switch careers, or pursue passion projects.
For many people, Coast FIRE is the more achievable first target. It removes the pressure of constant saving and provides a psychological safety net years before full FIRE.
Frequently Asked Questions
- What is the FIRE movement and how does the FIRE number work?
- FIRE (Financial Independence, Retire Early) is a strategy focused on saving and investing enough that your investment returns cover your living expenses permanently. Your FIRE number is calculated as annual expenses divided by your safe withdrawal rate — at a 4% rate, that's 25 times your annual spending. Once your portfolio reaches this amount, you can withdraw 4% per year (adjusted for inflation) with high historical probability of the money lasting 30+ years.
- How do I calculate my FIRE number?
- Divide your annual expenses by your safe withdrawal rate. At the standard 4% rate: $50,000 annual expenses / 0.04 = $1,250,000 FIRE number. For early retirees expecting 40-60 year retirements, using a 3.25% withdrawal rate is safer: $50,000 / 0.0325 = $1,538,462. Reducing expenses has a double effect — it lowers your FIRE number AND increases how much you save each year.
- What is the 4% rule and is it safe for early retirees?
- The 4% rule comes from the Trinity Study, which tested historical stock/bond portfolios over 30-year periods. It found that withdrawing 4% in year one (adjusting for inflation thereafter) succeeded roughly 95% of the time. For early retirees with longer time horizons (40-60 years), a 3.25-3.5% rate provides more safety. Flexible spending and part-time income further improve success rates.
- What is Coast FIRE and how is it different from regular FIRE?
- Coast FIRE means your current investments will grow to your full FIRE number by age 65 through compound interest alone — without any additional contributions. At that point, you only need to earn enough to cover today's expenses. Regular FIRE means your portfolio already covers all expenses through withdrawals. Coast FIRE is typically reached years earlier and gives you the freedom to reduce work hours or change careers.
- What savings rate do I need to retire early?
- It depends entirely on your timeline. A 50% savings rate leads to FIRE in roughly 17 years. A 25% rate takes about 32 years. A 75% rate can get you there in 7 years. The savings rate is so powerful because it works both sides of the equation — higher savings means more invested AND lower expenses, which means a smaller FIRE number. Even increasing your rate by 5% can shave years off your timeline.
- What is Barista FIRE and how does it differ from full FIRE?
- Barista FIRE means your portfolio covers most living expenses, but you still work part-time — often for health insurance or supplemental income. Coast FIRE is earlier: your investments grow to full FIRE by 65 with no more contributions. Full FIRE means your portfolio already covers all spending through withdrawals. Use the calculator above to see how lowering your expense target accelerates each milestone.