Coast FIRE Calculator
Free Coast FIRE calculator. Find out if your investments can grow to your retirement goal without additional contributions, and when you can stop saving aggressively.
FIRE Calculator — Financial Independence, Retire Early
Free FIRE calculator. Calculate your Financial Independence number, years to FIRE, and required savings rate. See how savings rate, income, and expenses affect your FIRE timeline.
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FIRE Number
$1,000,000.00
25× annual expenses
Years to FIRE
9
At 60% savings rate
Savings Rate
60%
$5,000.00/month
FIRE Progress20% — $200,000.00 of $1,000,000.00
Annual Savings⧉
$60,000.00
Saved per year
Annual Expenses⧉
$40,000.00
$3,333.33/month
Savings Rate Impact
| Savings Rate | Expenses | FIRE Number | Years to FI |
|---|---|---|---|
| 10% | $90,000.00 | $2,250,000.00 | 29 yrs |
| 20% | $80,000.00 | $2,000,000.00 | 23 yrs |
| 30% | $70,000.00 | $1,750,000.00 | 19 yrs |
| 40% | $60,000.00 | $1,500,000.00 | 15 yrs |
| 50% | $50,000.00 | $1,250,000.00 | 12 yrs |
| 60%← You | $40,000.00 | $1,000,000.00 | 9 yrs |
| 70% | $30,000.00 | $750,000.00 | 6 yrs |
| 80% | $20,000.00 | $500,000.00 | 3 yrs |
FIRE Milestones
| Year | Balance | % of FI | Progress |
|---|---|---|---|
| 1 | $274,000.00 | 27% | |
| 2 | $353,180.00 | 35% | |
| 3 | $437,903.00 | 44% | |
| 5 | $625,555.00 | 63% | |
| 9 🎉 | $1,086,371.00 | 100% | |
| 10 | $1,222,417.00 | 100% | |
| 14 | $1,868,736.00 | 100% |
Assumes constant returns and expenses. Real markets vary. Does not account for taxes, Social Security, or healthcare costs. FIRE planning should include a comprehensive withdrawal strategy.
Planning notes, formulas, and examples
About the FIRE Calculator — Financial Independence, Retire Early
The FIRE (Financial Independence, Retire Early) Calculator determines your FI number — the investment portfolio that can sustain your lifestyle indefinitely — and calculates how many years it will take to reach it based on your income, expenses, and savings rate.
The FIRE movement is built on a simple principle: save aggressively, invest wisely, and build a portfolio that generates enough passive income to cover your living expenses. The higher your savings rate, the faster you reach financial independence.
Enter your income, expenses, and current savings to see your personalized path to FIRE. A 50% savings rate — often the benchmark in the FIRE community — implies roughly 17 years to financial independence at typical market returns. Increasing that rate to 60% shaves the timeline to about 12 years, demonstrating how each percentage point of savings rate has a powerful compounding effect on your timeline. This calculator visualizes that relationship, making it easy to set realistic goals.
When This Page Helps
Achieving FIRE requires knowing three things: your target number, your current position, and how fast you're closing the gap. It gives all three, plus shows how small changes in savings rate or spending dramatically shift your timeline. Understanding this leverage is what separates those who achieve FIRE from those who only dream about it.
How to Use the Inputs
- Enter your annual after-tax income.
- Enter your annual expenses.
- Enter your current investment portfolio balance.
- Set your expected investment return rate.
- Set your withdrawal rate (default 4% for traditional FIRE).
- Review your FIRE number, savings rate, and years to FIRE.
Formula used
FIRE Number = Annual Expenses ÷ Withdrawal Rate
Savings Rate = (Income − Expenses) ÷ Income × 100
Years to FIRE: solve for N where Current + Annual Savings × FV Annuity Factor = FIRE Number
FV Annuity Factor = ((1 + r)^N − 1) / rExample Calculation
Result: FIRE Number: $1,000,000 — 8.2 years to FIRE at 60% savings rate
With $40K annual expenses and a 4% withdrawal rate, you need $1M. Saving $60K/year (60% savings rate) at 7% returns, starting from $200K, you reach $1M in about 8.2 years.
Tips & Best Practices
- Your savings rate is the most powerful variable — moving from 20% to 50% can cut decades off your timeline.
- Reducing expenses by $100/month cuts ~$30,000 from your FIRE number (at 4% SWR).
- The first $100K is the hardest milestone — compound growth accelerates dramatically after that.
- Consider Lean FIRE (basic needs), Regular FIRE, or Fat FIRE (premium lifestyle) based on spending.
- Build a tax-efficient withdrawal ladder: taxable → Roth conversion ladder → traditional accounts.
- Have 1-2 years of expenses in cash before pulling the FIRE trigger for sequence-of-returns protection.
The Math Behind FIRE
The core equation is simple: save a large percentage of your income and invest it. The higher your savings rate, the less you need (lower expenses = lower FIRE number) and the faster you accumulate. A 50% savings rate is the crossover point where you save one year of expenses for every year you work.
The Shockingly Simple Math of Early Retirement
If you save 10% of your income, you'll work for 51 years. At 25%, it's 32 years. At 50%, 17 years. At 75%, just 7 years. This relationship between savings rate and years to retirement is the fundamental insight of the FIRE movement. It's not about earning more — it's about the gap between earning and spending.
After FIRE: The Withdrawal Strategy
Reaching your FIRE number is half the battle. The other half is a sustainable withdrawal strategy. Most FIRE adherents use a combination of taxable account withdrawals (early years), Roth conversion ladders (after 5-year seasoning), and traditional retirement account access (after 59½). Planning this "glide path" is essential for long retirements.
Sources & Methodology
Last updated:
Methodology
This worksheet estimates a FIRE target by dividing annual expenses by the chosen withdrawal rate, then projects time-to-target from current savings, annual savings, and an assumed long-run return. It is a planning aid based on simplified retirement-spending assumptions, not a guarantee that a portfolio will last indefinitely.
Sources
- Determining Withdrawal Rates Using Historical Data (Journal of Financial Planning / Financial Planning Association) — Original William Bengen withdrawal-rate research often used as the starting point for FIRE-style planning rules.
- Sustainable withdrawal rates in retirement (Vanguard) — Current institutional research on withdrawal-rate assumptions and retirement spending risk.
- Compound Interest Calculator (Investor.gov) — Official U.S. investor education reference for compound-growth mechanics used in long-term projections.
Frequently Asked Questions
Your FIRE number is the investment portfolio needed to sustain your annual expenses indefinitely using a safe withdrawal rate. At 4% SWR, it's 25× your annual expenses. If you spend $40,000/year, your FIRE number is $1,000,000.
A 50% savings rate leads to FIRE in approximately 17 years. A 60% rate: ~12 years. A 70% rate: ~8-9 years. The math is powerful — each 10% increase in savings rate reduces your timeline by 3-5 years.
Lean FIRE typically means annual expenses under $40K (portfolio ~$1M). Regular FIRE is $40-100K in expenses ($1-2.5M). Fat FIRE is $100K+ ($2.5M+). The level you choose depends on your desired lifestyle and how aggressively you want to save.
No! Financial independence means work becomes optional. Many FIRE'd people continue working part-time, freelancing, or pursuing passion projects. Even modest income after FIRE dramatically reduces portfolio stress and extends its longevity.
ACA marketplace plans are the most common option. By managing income (keeping it low through Roth conversions and tax-efficient withdrawals), many early retirees qualify for significant premium subsidies. Budget $500-1,500/month per person for pre-Medicare healthcare.
FIRE is achievable at any income level, but a higher income makes it faster. On a $50K income, a 30% savings rate ($15K/year) reaches $1M in about 25 years assuming 7% returns and starting from $0. Lean FIRE ($600K target) is achievable in ~18 years.
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