FIRE Calculator — Financial Independence, Retire Early (4% Rule & Coast FI)
Calculate your path to financial independence with the FIRE framework. Enter your age, net worth, income, and expenses to see your FIRE number, estimated FIRE age, and years to go. Supports Standard, Lean, Fat, and Coast FIRE with a timeline chart and savings rate analysis.
FIRE Calculator
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Enter Values
FIRE Type
Standard FIRE
Monthly Savings Needed
$2,500
Projected NW at FIRE
$1.36M
Total Contributions
$640,000
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Net Worth Growth to FIRE
Standard FIRE: Standard FIRE using the 4% safe withdrawal rule. FIRE number = 25x annual expenses.
The Formula
The FIRE (Financial Independence, Retire Early) framework calculates how much you need saved (your FIRE number) and how many years it will take to reach it based on your savings rate and investment returns. The core equation links your savings rate directly to your timeline — the higher the rate, the fewer years you work. The 4% Rule provides the standard withdrawal rate: multiply your annual expenses by 25 to get your target number.
Variable Definitions
Target Nest Egg & Safe Withdrawal Rate
Your target nest egg is Annual Expenses ÷ Withdrawal Rate. The 4% rule establishes 25× expenses as the standard target. A higher SWR reduces the target but increases portfolio depletion risk, especially for early retirees with 50+ year horizons.
Savings Rate
The percentage of your income saved each year. This is the single most powerful lever in FIRE — the higher your savings rate, the fewer years you work. At a 50% savings rate, you need about 17 years. At 70%, about 8 years.
Net Worth
Your total invested assets (excluding home equity and personal property). This is your starting capital that will compound and grow through your FIRE journey.
How to Use This Calculator
- 1
Enter your current age, net worth, income, and annual expenses.
- 2
Choose your FIRE type: Standard (4% rule), Lean (minimalist lifestyle with lower expenses), Fat (luxury with higher spending), or Coast (work part-time while investments grow).
- 3
Adjust your expected investment return and target withdrawal rate. A 7% return with a 4% withdrawal rate is a common starting point.
- 4
The calculator will show your FIRE number, estimated FIRE age, and the years remaining. Try adjusting the savings rate to see how it affects your timeline.
- 5
Use the savings rate visualization panel to see how different savings rates map to different FIRE timelines. Small changes compound dramatically.
Common Applications
- Calculate the total retirement savings needed to achieve financial independence and the age at which you can stop working.
- Compare Standard, Lean, Fat, and Coast FIRE scenarios to see which financial independence path aligns with your lifestyle goals.
- Visualize how increasing your monthly savings rate dramatically shortens the number of years until you reach your FIRE number.
The higher your savings rate, the fewer years you need to work before reaching financial independence — from 37 years at 10% savings to only 5 years at 70%
Understanding the Concept
The FIRE movement is built on a simple but powerful insight: your savings rate determines your timeline to financial independence. The 4% Rule, derived from the Trinity Study (1998), states that a portfolio of 50% stocks and 50% bonds can sustain a 4% annual withdrawal rate adjusted for inflation over 30 years with a high probability of success. The math is elegant: at a 50% savings rate, you need about 17 years to reach FIRE. At a 70% savings rate, you need only about 8 years. Coast FIRE means you have enough saved now that if you stop contributing and let it compound, it will grow to your FIRE number by traditional retirement age — you "coast" by working a flexible job that covers current expenses. Lean FIRE targets a minimalist lifestyle with expenses typically under $40,000/year. Fat FIRE targets a more luxurious lifestyle with a larger nest egg, often $2M+. The savings rate chart below shows the relationship visually: even moving from a 20% to a 30% savings rate can cut years off your working career.
Frequently Asked Questions
Sources & References
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