FIRE Calculator Online
Calculate your FIRE target nest egg and years to early retirement based on the 4% rule.
Input Parameters
Live Result
Details
Steps
Calculate baseline FIRE Target Number via 4% Safe Withdrawal Rule
Simulate compound interest growth with annual contributions
Calculate Lean FIRE and Fat FIRE variations
Quick Answer & Understanding Your Result
The FIRE (Financial Independence, Retire Early) Number is calculated by multiplying your annual living expenses by 25 (based on the Trinity Study's 4% Safe Withdrawal Rate) ( FIRE Target = Annual Expenses × 25).
The 4 Variations of the FIRE Movement
- Lean FIRE: Minimalist lifestyle with annual expenses below national average ( FIRE Number approx 500 k - 750 k).
- Regular FIRE: Maintaining current middle-class lifestyle ( FIRE Number approx 1 M - 2.5 M).
- Fat FIRE: Luxurious retirement with generous spending budgets ( FIRE Number ge 3 M - 5 M).
- Barista / Coast FIRE: Investment portfolio covers future retirement; part-time work covers current living expenses.
Mathematical Foundations
- Target Portfolio: FIRE Number = Annual Expenses / Safe Withdrawal Rate (SWR).
- 4% Rule: Allows withdrawing 4% in year one, adjusted for inflation annually, with a 95%+ historical 30-year success rate.
Enter your annual spending and current savings above to project your exact retirement milestone date.
Formula & Calculation Logic
Mathematical FormulaBased on the Trinity Study Safe Withdrawal Rate of 4% adjusted for compounding portfolio returns.
Step-by-Step Guide
Enter Annual Expenses
Input estimated yearly living expenses in retirement.
Enter Current Net Worth
Input invested liquid assets and retirement accounts.
Set Monthly Savings
Input monthly recurring investment contribution.
Inspect FIRE Timeline
View target nest egg number, investment growth curve, and years until retirement.
Worked Examples Table
| Example | Input Values | Calculated Result | Explanation |
|---|---|---|---|
| Annual Expenses $40,000 at 4% SWR | Requires a $1M portfolio yielding $40k/year in passive withdrawals. | ||
| Aggressive Saver ($40k Expenses, $40k Savings/yr) | Provides instant quantitative evaluation for comparative practical analysis. |
Frequently Asked Questions
Evidence-Based Methodology & Authoritative References
Trinity University Study - Retirement Savings: Choosing a Withdrawal Rate That Is Sustainable
Vanguard - Retirement Nest Egg Calculator & Studies
Standard: ISO / W3C / IETF Authoritative Domain Standard
Formula: FIRE Number = Annual Living Expenses × 25 (or Annual Expenses / SWR)
Last Reviewed: August 21, 2026
Primary Source: Trinity University Study - Retirement Savings: Choosing a Withdrawal Rate That Is Sustainable
Reference Document: Vanguard - Retirement Nest Egg Calculator & Studies
Computation Privacy: 100% client-side 0ms computation, zero data retention
Calculated financial results are modeled based on standard financial and mathematical formulas. For actual contracts or commercial loans, official amortizations will depend on lender-specific terms, fees, and regulatory provisions.
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Calculated results are modeled based on standard scientific and mathematical formulas. Please verify with domain-specific technical documentation for specialized applications.