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FIRE CalculatorFIRE Number · Financial Independence Projection
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The FIRE calculator tells you exactly how many years stand between you and financial independence. Enter your current savings, monthly contributions, annual expenses in retirement, and expected return to see your FIRE number, projected retirement age, and full portfolio projection - all based on the standard 4% safe withdrawal rule.
All calculations use standard published formulas. Results are for informational use only.
FIRE Projection Details
Assumptions
Based on $50,000 in current savings and $1,000/month contributions, you will reach financial independence in 29.6 years at age 59.6 with an estimated portfolio of $1,502,061 - covering $60,000 in annual expenses at a 4.0% withdrawal rate.
FIRE number
$1,500,000
Target age: 59.6
29.6 yrs
Years to FIRE
59.6
Age at FIRE
$1,502,061
Projected Portfolio
Current Savings 3.3%Remaining Gap 96.7%
Getting started
How to Use This FIRE Calculator
1
Enter your current age and savings
Provide your starting point: your current age and total invested savings today.
2
Enter monthly contributions
The amount you plan to consistently add to your portfolio each month going forward.
3
Enter retirement expenses
What you expect to spend per year once you stop working. This determines your FIRE number.
4
Set assumptions and get results
Set your expected return and safe withdrawal rate. See your exact FIRE number and target date instantly.
Definitions
What is the FIRE Movement?
FIRE stands for Financial Independence, Retire Early. It is a personal finance philosophy built around aggressively saving and investing a large portion of your income so that passive investment returns can cover your living expenses - freeing you from dependence on employment income, often decades before traditional retirement age.
The FIRE movement gained widespread attention through blogs like Mr. Money Mustache and has grown into a diverse community ranging from extreme frugality (Lean FIRE) to comfortable wealth (Fat FIRE). What unites all FIRE variants is the same underlying math: accumulate enough invested assets that a safe annual withdrawal rate covers all your spending.
Types of FIRE
| FIRE Type | Annual Spending | Description |
|---|---|---|
| Lean FIRE | Under $40,000 | Minimal lifestyle; high frugality; lowest FIRE number. |
| Regular FIRE | $50,000-$80,000 | Comfortable but not lavish; the most common FIRE target. |
| Fat FIRE | $100,000+ | Generous lifestyle; requires a much larger portfolio. |
| Barista FIRE | Flexible | Partially retired; part-time income tops up investment withdrawals. |
| Coast FIRE | Current | Savings hit the point where compound growth covers retirement without further contributions. |
The calculation
FIRE Formula Explained
1
Calculate your FIRE number
FIRE Number = Annual Expenses ÷ Withdrawal Rate
At 4% WR: FIRE Number = Annual Expenses × 25
2
Project portfolio growth
Monthly return (rm) = (1 + annual_rate)^(1/12) − 1
Portfolio = [savings × (1 + rm)^n] + [contrib × ((1 + rm)^n − 1) ÷ rm]
3
Find when portfolio ≥ FIRE number
The calculator iterates month by month until the projected value hits the target.
FIRE number quick reference
| Annual expenses | 4% WR (25x) | 3.5% WR (28.6x) | 3% WR (33.3x) |
|---|---|---|---|
| $30,000 | $750,000 | $857,143 | $1,000,000 |
| $40,000 | $1,000,000 | $1,142,857 | $1,333,333 |
| $50,000 | $1,250,000 | $1,428,571 | $1,666,667 |
| $60,000 | $1,500,000 | $1,714,286 | $2,000,000 |
| $80,000 | $2,000,000 | $2,285,714 | $2,666,667 |
| $100,000 | $2,500,000 | $2,857,143 | $3,333,333 |
Examples
FIRE Calculation Examples
Lean FIRE
28-year-old high saver
$30K savings · $2,000/mo · $30K expenses
Age 44.2
FIRE Number: $750,000
Regular FIRE
35-year-old moderate saver
$80K savings · $1,500/mo · $55K expenses
Age 57.7
FIRE Number: $1,375,000
Fat FIRE
40-year-old high income
$400K savings · $3,000/mo · $100K expenses
Age 57.6
FIRE Number: $2,857,143 (at 3.5% WR)
Limitations
Important Limitations and Assumptions
This calculator is a planning and education tool, not a financial guarantee. Results depend entirely on the accuracy of your input assumptions:
- Investment returns are variable - historical averages are not guaranteed to repeat.
- Use a real (inflation-adjusted) return to keep expenses in today's dollars; otherwise your results will overstate purchasing power.
- Tax treatment of withdrawals, account types (Roth, traditional 401k, taxable), and contribution limits are not modeled.
- Sequence-of-returns risk - a market crash early in retirement - is not reflected in this model.
- Social Security, pension income, inheritance, or real estate income that could reduce the required withdrawal are excluded.
Treat results as directional guidance. Consult a qualified financial adviser for personalised retirement planning.
FAQ
Frequently asked questions
Q
What is the FIRE number?Your FIRE number is the total portfolio value you need to retire - large enough that safe annual withdrawals cover all your expenses indefinitely. At the standard 4% withdrawal rate, your FIRE number is 25 times your annual spending. For example, if you spend $50,000 per year, your FIRE number is $1,250,000.
Q
How is the FIRE calculator worked out?The calculator compounds your current savings and monthly contributions at your expected annual return rate (using monthly compounding) until the portfolio reaches your FIRE number. The year in which the balance crosses your FIRE number is your projected FIRE date. Projections assume a constant real return rate with no inflation adjustment built in - use a real return (nominal minus inflation) for the most accurate result.
Q
What is a safe withdrawal rate for FIRE?The 4% rule, derived from the Trinity Study, is the most widely used guideline. It suggests that withdrawing 4% of your portfolio in year one (adjusted for inflation thereafter) has historically sustained a 30-year retirement. For longer retirements - common in early retirement - many FIRE practitioners use 3.5% or 3%, which increases the FIRE number but reduces longevity risk.
Q
What expected return rate should I use?A real (inflation-adjusted) return of 6-7% per year is frequently cited for a diversified global stock index portfolio, based on long-term historical data. Use nominal returns (7-9%) if your expense estimates are also in nominal terms and you want to account for future cost-of-living increases explicitly.
Q
What is the difference between FIRE and Coast FIRE?Full FIRE means your portfolio has already reached your FIRE number - you can stop working entirely. Coast FIRE means your portfolio is large enough that compound growth alone will reach your FIRE number by a target retirement age, without further contributions. This FIRE Calculator projects when your combined savings plus contributions will reach the FIRE number.
Q
What are the different types of FIRE?Lean FIRE: retire on a minimal budget (typically under $40,000/year). Regular FIRE: retire on a moderate budget (~$50,000-$80,000/year). Fat FIRE: retire on a generous budget ($100,000+/year). Barista FIRE: cover most expenses from investments with part-time work topping up the rest. Coast FIRE: savings hit the point where compound growth does the rest with no further contributions needed.
Q
Can I reach FIRE without a high income?Yes - savings rate matters more than income. Research popularised by Mr. Money Mustache and the FIRE community shows that a 50% savings rate leads to financial independence in roughly 17 years regardless of income level, because living on half your income means you also need a smaller FIRE number.
Q
Is this FIRE calculator free?Yes - completely free with no account or download required. All calculations run entirely in your browser and no personal data is stored.
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