MyCalcBuddy

FIRE Calculator

Calculate when you can achieve Financial Independence and Retire Early.

Current Situation

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$
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Assumptions

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$

Your FIRE Number

$1,250,000

Retire at age 42 (12 years)

Progress to FIRE8.0%
Annual Savings
$60,000
Safe Withdrawal
$50,000
Monthly Withdrawal
$4,167
Coast FIRE Number
$117,079
Target Expenses
$50,000
With SS Adjustment
$650,000

What is FIRE (Financial Independence, Retire Early)?

FIRE is a movement and financial strategy focused on extreme savings and investment to achieve financial independence and the option to retire decades earlier than traditional retirement age. FIRE followers typically save 50-70% of their income.

Financial Independence means:

  • Work becomes optional: Investment returns cover living expenses
  • Freedom to choose: Work on what you love, not what pays bills
  • Security: Protection against job loss or career disruption
  • Time freedom: Control over how you spend your days

Core principles of FIRE:

  • Maximize savings rate (50%+ of income)
  • Invest aggressively in low-cost index funds
  • Reduce expenses through intentional living
  • Track progress toward your "FIRE number"

Calculating Your FIRE Number

Your FIRE number is the investment portfolio size needed to fund retirement indefinitely:

FIRE Number Formula

FIRE Number = Annual Expenses × 25

Where:

  • Annual Expenses= Your yearly living costs in retirement
  • 25= Multiplier based on 4% safe withdrawal rate

The 4% Rule (Safe Withdrawal Rate)

What is the 4% Rule?

Based on the Trinity Study, withdrawing 4% of your portfolio annually (adjusted for inflation) has historically sustained a portfolio for 30+ years with 95% success rate.

How it works:

  • Year 1: Withdraw 4% of initial portfolio
  • Subsequent years: Adjust for inflation
  • Portfolio of $1M = $40,000 annual income

Considerations:

  • 3.5% SWR: More conservative for early retirees (40+ year retirement)
  • 3% SWR: Very conservative, near-certain sustainability
  • Variable withdrawal: Adjust based on market conditions
  • Guardrails strategy: Reduce spending in down markets

Early retirement considerations:

The original study assumed 30-year retirement. For FIRE (40-50+ years), many recommend 3-3.5% withdrawal rate or flexible spending strategies.

Types of FIRE

Lean FIRE:

  • Minimalist lifestyle, expenses under $40K/year
  • Lower FIRE number ($1M or less)
  • Requires frugal living permanently
  • Faster to achieve but less margin for error

Regular FIRE:

  • Middle-class lifestyle, $40-80K/year expenses
  • FIRE number $1M-2M
  • Balanced approach to saving and living

Fat FIRE:

  • Comfortable/affluent lifestyle, $100K+/year
  • FIRE number $2.5M+
  • Requires higher income or longer timeline
  • More cushion for unexpected expenses

Barista FIRE (Coast FIRE):

  • Part-time work covers current expenses
  • Investments grow untouched until traditional retirement
  • Less pressure to reach full FIRE number
  • Healthcare through employer if in US

Coast FIRE:

  • Enough saved that compound growth will fund traditional retirement
  • Only need to cover current expenses
  • Can take lower-paying, fulfilling work

How to Use This Calculator

Our FIRE calculator helps you plan your path to financial independence:

  1. Enter Current Situation:
    • Annual income (after tax)
    • Current annual expenses
    • Current savings/investments
  2. Set Retirement Parameters:
    • Expected annual expenses in retirement
    • Safe withdrawal rate (3%, 3.5%, or 4%)
  3. Investment Assumptions:
    • Expected annual return (typically 7-10%)
    • Inflation rate (2-3%)

Results include:

  • Your FIRE number
  • Years to FIRE at current savings rate
  • Monthly/yearly savings needed
  • Impact of different savings rates
  • Coast FIRE and Barista FIRE options

Strategies to Accelerate FIRE

Increase Savings Rate:

  • 50% savings rate → ~17 years to FIRE
  • 60% savings rate → ~12.5 years to FIRE
  • 70% savings rate → ~8.5 years to FIRE

Reduce Expenses:

  • Housing: House hack, downsize, or relocate
  • Transportation: One car, used cars, public transit
  • Food: Cook at home, meal prep
  • Entertainment: Free activities, library, nature

Increase Income:

  • Negotiate raises and promotions
  • Side hustles and freelancing
  • Career switching to higher-paying field
  • Develop high-income skills

Geographic Arbitrage:

  • Earn in high-cost area, retire in low-cost
  • Consider international retirement destinations
  • Remote work from lower-cost regions

Worked Examples

Calculate FIRE Number

Problem:

Annual expenses of $40,000. What's the FIRE number using 4% and 3.5% withdrawal rates?

Solution Steps:

  1. 1At 4% SWR: FIRE Number = $40,000 × 25 = $1,000,000
  2. 2At 3.5% SWR: FIRE Number = $40,000 / 0.035 = $1,142,857
  3. 3Conservative approach requires ~$143K more

Result:

FIRE number is $1M at 4% SWR or $1.14M at 3.5% SWR. The lower withdrawal rate provides more safety for early retirement.

Years to FIRE Calculation

Problem:

Income $100K, expenses $50K (50% savings rate), starting with $100K saved. 7% returns. How long to $1.25M?

Solution Steps:

  1. 1Annual savings: $50,000
  2. 2Starting portfolio: $100,000
  3. 3Target (FIRE number): $1,250,000
  4. 4Using compound growth formula with contributions
  5. 5Year 5: ~$436K, Year 10: ~$845K
  6. 6Year 13-14: ~$1.25M reached

Result:

At 50% savings rate with 7% returns, FIRE is achieved in approximately 13-14 years.

Impact of Savings Rate

Problem:

Compare 40% vs. 60% savings rate on $80K income with 7% returns, starting from $0.

Solution Steps:

  1. 140% SR: Save $32K/year, need $1.2M (48K expenses × 25)
  2. 2Years to FIRE at 40% SR: ~21 years
  3. 360% SR: Save $48K/year, need $800K (32K expenses × 25)
  4. 4Years to FIRE at 60% SR: ~11 years
  5. 5Difference: 10 years earlier!

Result:

Increasing savings rate from 40% to 60% cuts FIRE timeline nearly in half - from 21 years to 11 years.

Tips & Best Practices

  • ✓Track every expense to understand true spending patterns
  • ✓Savings rate matters more than investment returns early on
  • ✓Reducing expenses has double benefit: save more AND lower FIRE number
  • ✓Build FIRE number based on actual expenses, not arbitrary targets
  • ✓Consider healthcare, taxes, and inflation in retirement planning
  • ✓Lean FIRE is riskier - maintain some margin for unexpected expenses
  • ✓Test your retirement budget before fully retiring
  • ✓Have a plan B: ability to earn some income if needed

Related Calculators

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Frequently Asked Questions

The 4% rule was designed for 30-year retirements. For 40-50+ year early retirements, many FIRE practitioners use 3-3.5% or flexible withdrawal strategies. The key is flexibility - reduce spending in down markets. Having some income (Barista FIRE) or geographic flexibility significantly improves success rates.
Healthcare is a major FIRE consideration. Options include: ACA marketplace plans (subsidies available at lower incomes), health sharing ministries, part-time work with benefits (Barista FIRE), COBRA temporarily, retiring abroad with lower healthcare costs, or budgeting $1,000-2,000/month for family coverage.
Social Security is a bonus, not included in FIRE calculations. You'll likely get reduced benefits (fewer high-earning years) but some benefits if you worked 10+ years. This provides additional cushion. Some FIRE plans use Social Security as backup, allowing higher early withdrawal rates.
Most FIRE practitioners follow simple, low-cost index fund investing: total US stock market (VTI/VTSAX), international stocks, and bonds (allocation based on risk tolerance). Keep expense ratios under 0.20%. Avoid market timing and stick with the plan through market volatility.
Sequence of returns risk is real. Mitigate by: keeping 1-3 years expenses in cash/bonds, being flexible with spending in early years, having part-time income potential, using a variable withdrawal strategy, or working 1-2 extra years as a buffer.
Yes, but it requires intentional planning. Child-related expenses (education, activities, larger housing) increase your FIRE number. Many families aim for FI by the time kids leave home, practice geographic arbitrage, or pursue Barista FIRE while children are young.

Sources & References

Last updated: 2026-01-22