FIRE Calculator – Financial Independence Retire Early
FI Number (Target)
$0
Annual Spending / SWR
Current Progress
0%
Years to FI
0
Projected FI Date
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Savings Rate
0%
What Is FIRE and How to Calculate Your FI Number
FIRE (Financial Independence, Retire Early) is a movement that prioritizes maximizing savings and investments to achieve financial freedom as early as possible. The core idea is simple: accumulate enough invested assets that the returns can sustain your living expenses indefinitely, making paid employment optional. Your FI Number is calculated by dividing your annual spending by your safe withdrawal rate (typically 4%), giving you the total portfolio value needed.
The 4% rule originates from the Trinity Study, which analyzed historical market data and found that a 4% initial withdrawal rate, adjusted annually for inflation, had a high probability of sustaining a portfolio for at least 30 years. Some practitioners use a more conservative 3.5% or even 3% rate for greater safety, while others comfortable with flexibility use up to 4.5%. This calculator lets you adjust the withdrawal rate to match your risk tolerance.
The years-to-FI calculation uses compound growth on your current savings combined with regular annual contributions at your expected rate of return. Your savings rate, expressed as the percentage of gross income you save, is the single most powerful predictor of how quickly you will reach financial independence. At a 50% savings rate with 7% real returns, most people can achieve FI in roughly 17 years regardless of income level.
Frequently Asked Questions
What is FIRE (Financial Independence Retire Early)?
FIRE stands for Financial Independence, Retire Early. It is a movement focused on aggressive saving and investing to accumulate enough wealth that the returns from your portfolio can cover your living expenses indefinitely, making work optional.
What is the 4% rule and how does it work?
The 4% rule suggests that retirees can withdraw 4% of their portfolio in the first year and adjust for inflation each year, with a high probability of the money lasting 30+ years. Your FI number is 25 times your annual spending.
What are the different types of FIRE?
Lean FIRE targets minimal spending (under $40k/year). Fat FIRE targets comfortable spending ($100k+/year). Barista FIRE involves semi-retirement with part-time work. Coast FIRE means your existing savings will grow to your target without additional contributions by traditional retirement age.
How can I reach financial independence faster?
Increase your savings rate by growing income and reducing expenses. Reducing expenses has a dual benefit: it increases savings AND lowers your FI number. A 50% savings rate leads to FI in roughly 17 years, while 75% drops it to about 7 years.