FIRE Calculator
Range: 18 - 70
Range: 31 - 80
In retirement
Safe withdrawal rate
Need to adjust to reach FIRE by 45
At current pace, you'll have $1,241,328.40 by age 45, but need $1,250,000.00.
FIRE Number
$1,250,000.00
4.00% rule
Projected at Target Age
$1,241,328.40
Years to FIRE
16 years
Age 46
Monthly Needed
$3,044.86
To hit target at goal age
FIRE Variants
Lean FIRE
$1,000,000.00
$40,000.00/yr (80% expenses)
Coast FIRE
$453,057.52
Amount needed now to coast
Fat FIRE
$1,875,000.00
$75,000.00/yr (150% expenses)
Savings Projection
| Year | Balance | Contributions |
|---|---|---|
| Year 0 | $100,000.00 | $100,000.00 |
| Year 1 | $144,623.63 | $136,000.00 |
| Year 2 | $192,473.11 | $172,000.00 |
| Year 3 | $243,781.64 | $208,000.00 |
| Year 4 | $298,799.26 | $244,000.00 |
| Year 5 | $357,794.11 | $280,000.00 |
| Year 6 | $421,053.70 | $316,000.00 |
| Year 7 | $488,886.33 | $352,000.00 |
| Year 8 | $561,622.59 | $388,000.00 |
| Year 9 | $639,616.96 | $424,000.00 |
| Year 10 | $723,249.54 | $460,000.00 |
| Year 11 | $812,927.94 | $496,000.00 |
| Year 12 | $909,089.19 | $532,000.00 |
| Year 13 | $1,012,201.95 | $568,000.00 |
| Year 14 | $1,122,768.73 | $604,000.00 |
| Year 15 | $1,241,328.40 | $640,000.00 |
FIRE Formula
FIRE Number = Annual Expenses ÷ Withdrawal Rate
$50,000.00 ÷ 4% = $1,250,000.00
The 4% Rule
The 4% withdrawal rate is based on the Trinity Study, suggesting you can withdraw 4% of your portfolio annually with a high probability of not running out of money over 30 years. Adjust based on your risk tolerance and timeline.
Calculator Assumptions
- Withdrawal rate: 4% rule based on 30-year retirement; early retirees (40+ years) may need 3-3.5% for safety
- Returns: Default 7% is historical average after inflation; sequence of returns risk not modeled
- Expenses: Assumed constant in real terms; healthcare costs typically increase with age
- Inflation:Expenses shown in today's dollars; withdrawal rate accounts for inflation adjustments
- Taxes: Not included in expense calculations; budget 15-25% extra for taxes on withdrawals
- Social Security: Not included; will reduce required savings if you qualify
About the FIRE Calculator
The FIRE Calculator helps you map out Financial Independence, Retire Early, the strategy of saving and investing aggressively so that investment income can cover your living expenses long before traditional retirement age. It centers on your FIRE number, the size of portfolio needed to sustain your annual spending indefinitely, typically calculated as your yearly expenses multiplied by 25 (the inverse of the 4 percent safe-withdrawal rule). By entering your current savings, annual savings amount, expected return, and target spending, the tool estimates how many years stand between you and financial independence.
The core insight FIRE makes visible is that your savings rate, not your income, is the dominant driver of your timeline. Someone saving 50 percent of their take-home pay reaches independence in roughly 17 years regardless of salary, while a 25 percent rate stretches that to around 32 years. The calculator demonstrates this by projecting your portfolio growth against your spending target, so you can experiment with cutting expenses or boosting contributions to see how dramatically the date moves.
FIRE comes in flavors the tool can help you explore: Lean FIRE for a minimalist budget, Fat FIRE for a more comfortable lifestyle with a larger number, and Coast FIRE where you have saved enough early that growth alone will carry you to retirement without further contributions. A practical tip is to base your FIRE number on realistic post-retirement spending, including healthcare, which is often underestimated and can dominate early-retirement budgets in countries without universal coverage. Many practitioners also pad their number or use a more conservative 3.5 percent withdrawal rate to survive sequence-of-returns risk in long retirements.
Because FIRE and conventional retirement share the same math, the FIRE Calculator pairs naturally with a standard Retirement Calculator for a fuller picture across both horizons. Use an Inflation Calculator to keep your spending target in real terms over multi-decade timelines, and a Paycheck Calculator to measure your true savings rate against your net income.
Frequently asked questions
- What is a FIRE number?
- It is the portfolio size needed to fund your lifestyle indefinitely, usually your annual expenses multiplied by 25, based on the 4 percent safe-withdrawal rule.
- Why does savings rate matter more than income?
- Your timeline to independence depends on the gap between what you earn and what you spend. A higher savings rate shortens the years to FIRE almost independent of your absolute salary.
- What is the difference between Lean, Fat, and Coast FIRE?
- Lean FIRE targets a minimalist budget, Fat FIRE funds a comfortable lifestyle with a larger portfolio, and Coast FIRE means you have saved enough early that compounding alone will reach your goal without new contributions.
- How long does it take to reach FIRE?
- It depends heavily on savings rate: roughly 17 years at a 50 percent rate and around 32 years at 25 percent, assuming typical market returns.
- Should I use a lower withdrawal rate than 4 percent?
- Many early retirees use 3.5 percent or pad their number to guard against sequence-of-returns risk over the longer horizons that early retirement entails.
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