FIRE Number Calculator
Calculate your Financial Independence, Retire Early number, years to FIRE, savings rate, and Coast FIRE target.
Enter your financial details and click calculate.
What This Calculator Does
This calculator determines your FIRE (Financial Independence, Retire Early) number, estimates years until you reach financial independence, and calculates your savings rate. It also computes your Coast FIRE number, which is the amount needed today that will grow to your full FIRE number through investment returns alone.
The Formula
The FIRE number represents the portfolio size needed to sustain your annual expenses indefinitely using a safe withdrawal rate (typically 4%). For example, $40,000 annual expenses / 4% = $1,000,000 FIRE number. The years to FIRE depend on your current savings, annual contributions, and investment returns.
Step-by-Step Example
Enter annual retirement expenses
Your expected annual spending in retirement. Example: $40,000. This is the most important input.
Enter current savings and contributions
Current investment portfolio value ($100,000) and how much you save annually ($30,000).
Set withdrawal and return rates
Withdrawal rate (4% is standard) and expected investment return (7% is a common assumption).
Review your FIRE plan
See your FIRE number ($1,000,000), years to FIRE, savings rate, and Coast FIRE number.
Real-World Use Cases
FIRE Goal Setting
Calculate the exact portfolio size you need and create a concrete savings plan to reach it.
Savings Rate Optimization
See how increasing your savings rate dramatically reduces years to financial independence.
Coast FIRE Assessment
Determine if your current savings could grow to your FIRE number without additional contributions, allowing you to downshift your career.
Common Mistakes to Avoid
Underestimating retirement expenses. Healthcare costs alone can be $10,000-$20,000+ per year before Medicare eligibility at age 65.
Using pre-retirement spending as your FIRE expense estimate. Some costs decrease (commuting) while others increase (healthcare, travel).
Ignoring inflation when projecting expenses. $40,000 today will need to be $80,000+ in purchasing power in 25 years at 3% inflation.
Not accounting for taxes on retirement withdrawals. Traditional 401(k) and IRA withdrawals are taxed as ordinary income.
Frequently Asked Questions
Accuracy and Disclaimer
FIRE calculations are projections based on assumptions about returns, inflation, and expenses. Market conditions, healthcare costs, tax law changes, and lifestyle shifts can significantly affect outcomes. This is an educational tool, not personalized financial advice. Consult a certified financial planner.
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