FIRE Calculator
Calculate your Financial Independence, Retire Early target and see how many years until you can stop working.
FIRE target
$1,000,000
Portfolio needed to cover $40,000/yr at 4% withdrawal.
Years to FIRE
13
You could reach financial independence in 13 years.
Savings rate
50%
You save $40,000 per year from your income.
Progress to FIRE
Current: $100,000
Remaining: $900,000
Start: Today
Latest: Year 13
Final value: $1,092,212
Share your results
Understanding the calculator
How it works
The FIRE calculator answers a question that traditional retirement planning often ignores: what if you want to stop working decades before the standard retirement age? FIRE — Financial Independence, Retire Early — reframes retirement as a function of savings rate rather than age. The higher the percentage of income you save and invest, the fewer years you need to work.
The math starts with your annual expenses and a safe withdrawal rate to determine your FIRE target — the portfolio size that can sustain your spending indefinitely. Then it projects your current savings forward with monthly contributions and compound growth to find when you cross that threshold.
The math behind it
Key formulas
FIRE Target = Annual Expenses / Safe Withdrawal Rate
If you spend $40,000/year and use a 4% withdrawal rate: $40,000 / 0.04 = $1,000,000 needed.
Years to FIRE decreases exponentially as savings rate increases
At 20% savings rate: ~37 years. At 50%: ~17 years. At 75%: ~7 years. The relationship is non-linear because higher savings both build wealth faster and reduce the target.
Real-world scenarios
Practical examples
Couple earning $120,000, saving 40%
Annual expenses: $72,000. FIRE target at 4%: $1,800,000. With $200,000 already saved and $4,000/month contributions at 7%, they reach FIRE in approximately 15 years.
Single person cutting expenses from $50k to $35k/year
FIRE target drops from $1,250,000 to $875,000 — a $375,000 difference. The expense reduction both lowers the target and increases the savings rate, accelerating FIRE by several years.
Impact of a 3.5% vs 4% withdrawal rate
At $40,000/year expenses: 4% requires $1,000,000. 3.5% requires $1,143,000. The more conservative rate adds $143,000 to the target but provides greater safety for a longer retirement.
Getting the most value
When to use this calculator
Use a FIRE calculator when you want to understand how your current savings trajectory maps to financial independence. Even if full early retirement is not your goal, knowing your FIRE number provides a target that puts all other financial decisions in context.
Run the calculator when considering lifestyle changes — a lower-cost city, a smaller home, or reduced discretionary spending. Each expense reduction creates a double benefit: more savings and a lower FIRE target.
If you are approaching a potential FIRE date, stress-test the plan with conservative assumptions: lower returns, higher inflation, unexpected large expenses. The calculator helps you determine whether your buffer is sufficient.
Expert guidance
Tips and best practices
- Savings rate is the most powerful variable in the FIRE equation. It simultaneously builds your portfolio faster and reduces the amount you need by lowering your spending baseline.
- The 4% rule was derived from a 30-year retirement. For early retirees planning 40-50+ year retirements, a 3.25-3.5% rate provides more safety margin.
- Flexibility is a hedge against uncertainty. If you can reduce spending by 10-15% during market downturns, your portfolio survives scenarios that a rigid withdrawal plan would not.
- Healthcare is often the largest expense in early retirement before Medicare eligibility at 65. Budget $500-$1,500/month depending on location and coverage needs.
- Many FIRE practitioners do not stop earning entirely. Part-time work, consulting, or passion projects that generate even modest income dramatically improve portfolio survival rates.
Summary
Key takeaways
- FIRE is about savings rate, not income level. High savers can reach financial independence regardless of salary.
- Reducing expenses has a double effect: it increases savings and lowers the amount your portfolio needs to sustain you.
- The 4% withdrawal rule is a starting guideline — early retirees with 40+ year horizons should consider more conservative rates.
- Healthcare and taxes are the two most commonly underestimated costs in early retirement planning.
- Flexibility in spending and the ability to earn even modest income dramatically improve long-term portfolio survival.
Common questions
Frequently asked questions
What is the FIRE movement?
FIRE stands for Financial Independence, Retire Early. The idea is to save and invest aggressively so your portfolio can sustain your living expenses indefinitely, freeing you from mandatory employment.
What savings rate do I need for FIRE?
The higher your savings rate, the faster you reach FIRE. At 50% savings rate, FIRE is roughly 17 years away. At 75%, it is about 7 years. The math depends on your return assumptions and spending level.
Is the 4% withdrawal rate safe?
The 4% rule is based on historical data showing a 4% initial withdrawal rate, adjusted for inflation, survived most 30-year periods. Some prefer 3.5% for extra safety, especially for early retirees with longer time horizons.
Compare investment platforms for FIRE
Low-cost brokerages popular with the FIRE community.
| Provider | Type | Highlight | |
|---|---|---|---|
| Vanguard | Brokerage | Pioneer of low-cost index investing | Open account |
| Fidelity | Brokerage | Zero-fee index funds, no minimums | Open account |
| M1 Finance | Brokerage | Automated investing with custom portfolios | Get started |
We may earn a commission when you click on links in this table. This helps support the site at no extra cost to you.
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