Finance Tool✨ New Release
FIRE Calculator (Financial Independence, Retire Early)
Calculate your target FIRE net worth, required annual savings rate, and exact timeline to achieve financial independence using safe withdrawal rules.
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Interactive FIRE Calculator (Financial Independence, Retire Early) Workspace
Financial Independence Roadmap
FIRE Target Number$1,200,00025x annual expenses
Years to FIRE17.8 Yearsretire at age 45.8
LeanFIRE Threshold$900,00075% frugal baseline
FatFIRE Threshold$1,800,000150% affluent baseline
Mathematical Formula & Variables
Equation Model
FIRE Target Number = Annual Living Expenses / Safe Withdrawal Rate (SWR)Calculates target financial independence portfolio size using the Trinity Study 4% rule (25x expenses) and projects compound investment trajectory.
Variable Definitions
| Symbol | Description |
|---|---|
| Current Age | Your current age in years. |
| Annual Living Expenses | Expected annual spending in retirement ($). |
| Current Invested Net Worth | Existing liquid investment portfolio ($). |
| Annual Savings | Amount saved and invested each year ($). |
| Expected Investment Return | Estimated inflation-adjusted annual return (%). |
| Safe Withdrawal Rate (SWR) | Annual portfolio withdrawal percentage (default 4.0%). |
How to Use the FIRE Calculator (Financial Independence, Retire Early)
- Enter your current age and current invested net worth.
- Input your target annual living expenses during retirement.
- Enter your annual savings contribution.
- Select your safe withdrawal rate (e.g. 4.0% standard or 3.5% conservative).
- Analyze your FIRE Target Number, Years to FIRE, retirement age, and LeanFIRE/FatFIRE spectrum.
FIRE Timeline Calculation Example
Scenario Context: An investor age 28 has $50,000 in index funds, spends $48,000 per year, saves $30,000 per year, and targets early retirement with a 4.0% safe withdrawal rate at a 7% real investment return.
Step 1: Calculate FIRE Target Net Worth = $48,000 / 0.04 = $1,200,000 (25 × Expenses)
Step 2: Calculate Compound Portfolio Growth with $30,000 Annual Savings
Step 3: Portfolio reaches $1,200,000 in 17.2 Years
Step 4: Target Financial Independence Age = 28 + 17.2 = Age 45.2
Step 5: LeanFIRE Threshold (80% expenses) = $960,000 (Achieved at Age 42)
Reaches Financial Independence at Age 45 with a $1,200,000 portfolio generating $48,000/year in passive withdrawals.
Frequently Asked Questions
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