HomeCalculatorsFinancial CalculatorsFIRE Calculator

FIRE Calculator: Financial Independence & Early Retirement

Discover how close you are to financial independence. Enter your savings, annual contributions, and target spending to see your FIRE number and the years until you can retire early.

$
Total value of your retirement/investment accounts (e.g., 401k, IRA, brokerage).
$
Total amount you can save and invest each year (e.g., 401k contributions, IRA, taxable investments).
$
Your expected annual spending during retirement (in today's dollars). Used to calculate your FIRE number.
%
Average annual return before inflation (e.g., 7% for a diversified portfolio).
%
Long-term average inflation (historically ~3%).
%
The percentage of your portfolio you can withdraw annually in retirement (classic 4% rule).

What is FIRE (Financial Independence, Retire Early)?

FIRE stands for Financial Independence, Retire Early. It's a movement focused on achieving financial independence—having enough invested assets to cover living expenses indefinitely—so you can retire decades earlier than traditional retirement age. The core principle is the 4% rule: if you can live on 4% of your portfolio each year (25 times your annual expenses), you are financially independent. This FIRE calculator helps you estimate how many years you need to reach that goal based on your savings, investments, and spending.

How the FIRE Calculator Works

FIRE Number (Target Portfolio) = Annual Expenses / Withdrawal Rate
Years to FI = n such that: Portfolio × (1 + rreal)n + Annual Savings × ((1 + rreal)n - 1) / rreal = FIRE Number

Where:
rreal = Real return after inflation = (1 + nominal return) / (1 + inflation) - 1 ≈ nominal return – inflation (for small values).
The calculator solves for n using real returns, ensuring the FIRE number is expressed in today's purchasing power.

Real‑Life FIRE Example

Scenario: You are 30, have $50,000 saved, save $20,000/year, expect to spend $40,000/year in retirement. You use a 4% withdrawal rate, so your FIRE number is $1,000,000 ($40,000 ÷ 0.04). With a 7% nominal return and 3% inflation (real return ~3.88%), the calculator shows you'll reach FI in about 22 years (age 52). Your savings rate is 33% (based on income). Higher savings rate dramatically shortens the timeline.

Frequently Asked Questions

❓ What is the 4% rule?
The 4% rule suggests that withdrawing 4% of your portfolio in the first year of retirement, adjusted for inflation thereafter, gives a high probability of not running out of money over a 30-year retirement. For early retirement, some use a 3-3.5% withdrawal rate for added safety.

❓ How does savings rate affect FIRE?
Your savings rate is the single most important factor in how quickly you can achieve FI. A higher savings rate reduces your expenses (or increases your savings) and shortens the time to FI exponentially. Use this calculator to see the impact of different savings rates.

❓ Should I use nominal or real returns?
We use real returns (after inflation) to keep everything in today's dollars. This gives you a realistic picture of purchasing power without worrying about future inflation. The FIRE number is also in today's dollars.

❓ What about Coast FIRE, Barista FIRE, or Lean FIRE?
Coast FIRE means you have enough saved that without further contributions, your investments will grow to your FIRE number by retirement age. Barista FIRE involves working part-time to cover expenses while letting investments grow. Lean FIRE is achieving FI with a very minimal spending level. This calculator focuses on the standard FIRE timeline but can be adapted by adjusting annual savings or expenses.

❓ How accurate is this FIRE calculator?
It's a deterministic projection based on fixed returns and contributions. Actual market returns vary, and sequence of returns risk matters. Use it as a planning tool to set goals and track progress.