FIRE Number Calculator
Your FIRE number is the amount of invested assets needed to cover your living expenses indefinitely, based on a safe withdrawal rate.
What Is a FIRE Number?
Your FIRE number is the total invested portfolio value needed to fund your lifestyle indefinitely — without ever working again. The term comes from the FIRE movement: Financial Independence, Retire Early. The core idea is simple: once your portfolio is large enough, investment returns alone cover 100% of your living expenses forever.
The most widely used formula is the 25x rule, derived directly from the 4% safe withdrawal rate:
FIRE Number = Annual Expenses × 25
If you spend $50,000/year, your FIRE number is $1,250,000. At that portfolio size, 4% equals $50,000 — your exact annual spending, covered by returns alone.
FIRE Numbers by Annual Spending
| Annual Spending | 4% Rule (25x) | 3.5% Rule (28.6x) | 3% Rule (33x) |
|---|---|---|---|
| $30,000 | $750,000 | $857,000 | $990,000 |
| $50,000 | $1,250,000 | $1,429,000 | $1,650,000 |
| $60,000 | $1,500,000 | $1,714,000 | $1,980,000 |
| $80,000 | $2,000,000 | $2,286,000 | $2,640,000 |
| $100,000 | $2,500,000 | $2,857,000 | $3,300,000 |
Use a 3.5% withdrawal rate (28.6x multiplier) if you plan to retire in your 40s with a 35-40 year horizon. Use 3% (33x) for a 40-50 year retirement horizon and maximum safety.
How to Use This Calculator
Enter your annual expenses and adjust the withdrawal rate slider to match your retirement timeline. The calculator instantly shows your FIRE number, current gap, and estimated time to reach financial independence based on your current savings and monthly contributions.
The shareable URL updates automatically — copy the link to save your scenario or share it with a financial advisor or partner.
Two Levers That Move Your FIRE Number
Reduce expenses. Every $100/month cut from spending reduces your FIRE number by $30,000 at the 4% withdrawal rate. Lower spending simultaneously reduces the target and increases monthly savings — the most powerful lever available.
Adjust withdrawal rate. Dropping from 4% to 3.5% increases your required portfolio by 14%. Many early retirees accept a slightly larger target in exchange for dramatically improved portfolio survival probability over 40-50 years.
Related: Calculate your Coast FIRE number — the amount needed to stop saving and let compound growth carry you to retirement.
Frequently Asked Questions
Is the 4% rule still valid in 2026?
Yes, as a starting framework. The Trinity Study's 4% rate has survived every historical 30-year period including the Great Depression and 2008 financial crisis. For retirements longer than 30 years, 3-3.5% is more appropriate. Many FIRE practitioners use 3.5% as a practical default for early retirement.
Should I include home equity in my FIRE number?
No — count only liquid, investable assets. Your primary residence is not a retirement income source unless you sell and downsize. Home equity is worth tracking in your net worth, but your FIRE number should reflect only portfolio assets that generate returns.
What if I have Social Security or a pension?
Subtract your expected annual SS or pension income from your annual expenses before calculating. If you spend $65,000/year and expect $20,000/year from Social Security, calculate on $45,000: $45,000 × 25 = $1,125,000 FIRE number instead of $1,625,000 — a $500,000 reduction.
How does inflation affect my FIRE number?
The 4% rule already accounts for inflation — it assumes you increase withdrawals by the inflation rate each year. Calculate your FIRE number using today's dollars; the withdrawal mechanism handles future inflation automatically. Use our inflation calculator to see how inflation erodes purchasing power over time.
Can I retire before reaching my full FIRE number?
Yes — with supplemental income. Many people retire at 90-95% of their FIRE number while maintaining small side income (consulting, part-time work, rental income) that covers the gap. This hybrid approach, sometimes called Barista FIRE or semi-retirement, is very common in practice.