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FIRE Calculator - Financial Independence / Retire Early Calculator
Finance

FIRE Calculator

Last Updated: July 11, 2026

Calculate your Financial Independence (FIRE) number and discover when you can retire early using the proven 4% safe withdrawal rule.

Your FIRE Results

FIRE Number

$0

= Annual Expenses × 25
Years to FIRE

0 years

Projected Savings at Retirement

$0

0%

How to Use This FIRE Calculator

  1. Enter your current age and your desired retirement age to determine the time horizon for your FIRE journey.
  2. Input your current savings (total investment portfolio balance today).
  3. Enter your annual savings — the amount you plan to save and invest each year.
  4. Provide your annual expenses — this is the yearly spending you expect in retirement.
  5. Adjust the expected return rate (default 7% for a stock-heavy portfolio) and the safe withdrawal rate (default 4% based on the Trinity Study).
  6. Click "Calculate FIRE" to see your FIRE number, years to financial independence, projected portfolio value, and progress bar.

Formula: How the FIRE Calculation Works

The 4% Rule (Trinity Study)

FIRE Number = Annual Expenses ÷ Safe Withdrawal Rate

With the standard 4% rule: FIRE Number = Annual Expenses × 25

For example, if your annual expenses are $40,000, your FIRE number is $40,000 × 25 = $1,000,000. This means you need $1,000,000 invested to safely withdraw $40,000 per year without depleting your portfolio over a 30+ year retirement.

The calculator uses compound interest to project your savings growth: A = P(1 + r/n)^(nt) + PMT × [((1 + r/n)^(nt) - 1) / (r/n)], where P is current savings, PMT is annual savings, r is return rate, n is compounding frequency (annual), and t is years.

FIRE Examples

ScenarioAgeSavingsAnnual SaveExpensesFIRE NumberYears to FIRE
Aggressive Saver25$50,000$60,000$30,000$750,000~8 years
Moderate Planner30$100,000$40,000$50,000$1,250,000~15 years
Later Starter40$200,000$30,000$45,000$1,125,000~12 years

Frequently Asked Questions

FIRE stands for Financial Independence, Retire Early. It's a movement where people save aggressively (often 50-70% of their income) to achieve financial independence decades before the traditional retirement age of 65. The goal is to accumulate enough invested assets so that the returns can cover living expenses indefinitely.

The 4% rule comes from the 1998 Trinity Study. It states that if you withdraw 4% of your retirement portfolio in the first year and adjust for inflation each subsequent year, there's a very high probability (95%+) your money will last at least 30 years. This means you need 25 times your annual expenses saved to retire safely.

Using the 4% rule, multiply your desired annual retirement spending by 25. If you need $50,000/year, you need $1,250,000. If you need $80,000/year, you need $2,000,000. Some FIRE adherents use a more conservative 3.5% withdrawal rate (multiply expenses by ~28.6) for early retirement spanning 40+ years.

Coast FIRE is the point where you have enough in retirement accounts that, without adding another dollar, compound growth will fund a traditional retirement at age 65. You no longer need to save for retirement — you just need to cover current expenses. This allows you to take lower-paying, more fulfilling work.

Barista FIRE is a hybrid approach where you semi-retire and work a part-time job (like at a coffee shop) to cover daily expenses and health insurance, while your investments grow untouched. You need a smaller nest egg than full FIRE since part-time income supplements your portfolio withdrawals.

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Disclaimer

This FIRE calculator provides estimates for educational and planning purposes only. It does not constitute financial advice. Actual investment returns vary, and past performance does not guarantee future results. Inflation, taxes, healthcare costs, and unexpected expenses are not fully accounted for. Consult a qualified financial advisor before making retirement decisions.

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