FIRE Calculator
Calculate your path to Financial Independence, Retire Early (FIRE) based on savings rate and expenses.
Your investment will grow to $300,851 over 20 years, earning $170,851 in compound interest.
Why This Calculation Matters
The FIRE Calculator helps you make better retirement decisions by putting the math directly in front of you. Instead of relying on averages or guesswork, plug in your own numbers and see how the key inputs, rate, term, amount, and timing, interact. Small changes to any one of them can have outsized effects over years or decades.
How to Use This Calculator
- Enter your values in the input fields, each one has a label and help text explaining what to type.
- Results appear instantly as you type; there's no "calculate" button to press.
- Change any input to compare scenarios side by side.
All math happens in your browser. Nothing you type is sent to a server, saved, or shared.
Key Inputs to Get Right
The most important numbers are usually the interest rate and the time horizon. Over years or decades, small rate differences compound into large dollar differences, so it's worth sanity-checking the rate against current market data before acting on any result.
Financial Independence, Retire Early
FIRE is a movement focused on extreme savings and investment to achieve financial independence decades earlier than traditional retirement.
FIRE Variants
- Lean FIRE: Minimal expenses, typically under $40,000/year
- Regular FIRE: Moderate lifestyle, $40,000-$100,000/year
- Fat FIRE: Comfortable lifestyle, $100,000+/year
- Barista FIRE: Part-time work covers expenses while investments grow
The Math
Your FIRE number = Annual expenses × 25. With a 50% savings rate, you can achieve FIRE in approximately 17 years.
When to Use This Calculator
- Model scenarios before making a major financial decision involving retirement.
- Compare different inputs side by side to see how rate, term, or amount changes your outcome.
- Sanity-check numbers a lender, advisor, or spreadsheet has given you.
- Build a realistic financial plan grounded in your actual numbers, not averages.
Limitations & Common Mistakes
- Results are estimates, actual terms depend on credit, lender policy, taxes, and fees not captured here.
- Rates and prices change daily; recompute with current numbers before signing documents.
- Does not constitute financial advice. For major decisions, consult a licensed advisor.
Frequently Asked Questions
What is a FIRE number?
Your FIRE number is 25 times your annual expenses, based on the 4% safe withdrawal rate. If you spend $40,000/year, your FIRE number is $1,000,000. Once your investments reach this amount, you can live off 4% annual withdrawals indefinitely.
What savings rate do I need for FIRE?
Your savings rate determines your timeline. At 50%, you're about 17 years from FIRE. At 65%, about 10 years. At 75%, about 7 years. The math works regardless of income level, it's the ratio of savings to spending that matters.
How accurate is the FIRE Calculator?
Results use standard financial formulas and are a reliable planning estimate. Exact numbers depend on your lender's rates, fees, and underwriting, always verify with a loan estimate before signing.
Does this account for taxes, insurance, and fees?
The calculator shows the core figure by default. Taxes, insurance, PMI, HOA dues, and closing costs can materially change your monthly cost, factor them in when budgeting.
Is this calculator free to use?
Yes. The FIRE Calculator is free, requires no signup, and runs entirely in your browser, your inputs are never sent to a server.
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