What is the FIRE Movement?
FIRE (Financial Independence, Retire Early) is a lifestyle movement focused on extreme savings and investment to achieve financial independence and retire much earlier than traditional retirement age. The key principle is saving 50-70% of your income and investing it to build a portfolio that can sustain your living expenses through passive income.
How to Use the FIRE Calculator
Enter your annual living expenses, the percentage of income you save each month, your current total savings, the annual return you expect from investments, and a safe withdrawal rate (typically 4%). The calculator simulates year-by-year portfolio growth and tells you how many years until your portfolio can sustain your lifestyle indefinitely.
The Formula Behind FIRE
Your FIRE Number = Annual Expenses ÷ Withdrawal Rate. For example, if you spend $40,000 per year and use a 4% withdrawal rate, your FIRE Number is $1,000,000. The calculator then models how long it takes your savings to reach that number, factoring in annual contributions and compound returns. The 4% rule is based on the Trinity Study, which found that a diversified portfolio historically survived 30+ year withdrawals at this rate.
Real-World FIRE Example
Consider someone earning $80,000 per year, saving 50% ($40,000/year), with $20,000 already saved. At a 7% average annual return and 4% withdrawal rate, their FIRE Number is $1,000,000. The calculator shows they would reach financial independence in approximately 15 years. Increasing the savings rate to 60% would reduce this to about 12 years — demonstrating how savings rate is the most powerful lever in the FIRE equation.
Frequently Asked Questions
What is a safe withdrawal rate?
The safe withdrawal rate (SWR) is the percentage of your portfolio you can withdraw annually without running out of money over a long retirement. The most commonly cited rate is 4%, based on the Trinity Study. More conservative planners use 3.5% or 3% to account for longer retirements or lower expected returns.
Does the FIRE calculator account for inflation?
This calculator uses nominal returns. For a more conservative estimate, enter a "real" return rate (nominal return minus inflation, typically 4-5% instead of 7-8%). This gives you a result in today's purchasing power.
What is the most important factor for reaching FIRE?
Savings rate is by far the most important factor. A person earning $50,000 saving 50% will reach FIRE faster than someone earning $200,000 saving 10%. The math is clear: higher savings rate means both more money invested AND lower expenses to sustain — a double benefit.