🔥 FIRE Calculator
How much do you need to retire early? How far are you from financial independence?
Calculate Your FIRE Number
How to Use the FIRE Calculator
Steps:
1. Enter your Annual Expenses - what you actually spend per year.
2. Enter your Current Savings - everything invested right now.
3. Enter your Monthly Contribution - what you add each month.
4. Set your Expected Annual Return (7% is the S&P 500 historical average).
5. Enter your Current Age to see your retirement age.
6. Leave the Withdrawal Rate blank to use the standard 4% rule.
Example:
💸 Annual Expenses: $40,000
🏦 Current Savings: $50,000
📅 Monthly Contribution: $1,000
📈 Expected Return: 7%
🎂 Current Age: 25
Results:
FIRE Number: $1,000,000
Years to FIRE: ~25 years
Retire at age: 50 🔥
What is FIRE?
FIRE stands for Financial Independence, Retire Early. It's a movement built around one idea: if your investment portfolio is large enough, the returns it generates will cover your living expenses forever, meaning you never have to work for money again unless you want to.
The goal isn't necessarily to stop working at 35 and sit on a beach. For most people in the FIRE community, it's about having the option, the freedom to choose how you spend your time without being forced to sell it for income.
The 25x Rule and the 4% Safe Withdrawal Rate
The two pillars of FIRE math come from the Trinity Study, a landmark research paper from 1998 that analysed portfolio survival rates across decades of market history.
- The 4% rule - you can withdraw 4% of your portfolio per year in retirement and it will statistically last 30+ years across most market conditions.
- The 25x rule - your FIRE number is simply your annual expenses × 25. Spending $40,000/year? You need $1,000,000 invested.
- These two rules are mathematical inverses of each other: 1 ÷ 0.04 = 25.
Types of FIRE
- Lean FIRE - retire on a minimal budget, typically under $40,000/year. Requires aggressive frugality both before and after retirement.
- Fat FIRE - retire comfortably with $80,000+ per year. Requires a larger portfolio but allows a normal or luxurious lifestyle.
- Barista FIRE - semi-retire with a smaller portfolio and supplement with part-time work to cover the gap. A popular middle-ground.
- Coast FIRE - invest enough early that compound interest alone will grow it to your FIRE number by traditional retirement age, even without further contributions.
How to Reach FIRE Faster
- Increase your savings rate - the single biggest lever. Going from 20% to 40% savings rate cuts your timeline dramatically.
- Reduce expenses - every dollar you cut lowers both your FIRE number and your monthly spend, hitting both sides of the equation.
- Invest in low-cost index funds - fees compound against you just as powerfully as returns compound for you.
- Avoid lifestyle inflation - as income grows, keep expenses flat and invest the difference.
- Start as early as possible - time is the most powerful variable in the compound interest equation.
Once you know your FIRE number, pair this with our Compounding Calculator to model your exact growth curve, or use the Savings Goal Calculator to find your required monthly contribution. More in the Blog.