Financial Independence, Retire Early (FIRE) Calculator
Your FIRE number is annual expenses multiplied by 25, the target that supports a 4% safe withdrawal rate. Enter expenses, current savings, monthly contributions, and expected return to see how many years until financial independence.
Retirement / FIRE
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How the Retirement / FIRE Works
The FIRE movement uses the 4% rule: if you withdraw 4% of your portfolio each year, historically it lasts through most retirement periods. Multiplying annual expenses by 25 gives the portfolio needed to hit that rate. This calculator projects your savings month by month, compounding at your expected return and adding contributions, until the balance reaches the target. The result is years to financial independence, not a guarantee. Sequence-of-returns risk, healthcare costs, and lifestyle changes all affect the real outcome, and a lower withdrawal rate raises the target. Increasing contributions or trimming expenses both accelerate the timeline, and expenses are the more powerful lever because they reduce the target and free up savings at once. Treat the projection as a planning range, then stress-test it with lower returns and higher spending. Track your savings rate rather than the portfolio balance, because the percentage of income you keep is the single biggest driver of your FIRE date.
Formula Used
FIRE Number = Annual Expenses x 25 (4% rule); projected month by month until the balance reaches the target
Annual expenses $40,000, current savings $100,000, monthly contribution $1,000, 7% return. FIRE target = $1,000,000, reached in about 21 years.
When to Use This Calculator
- Setting a long-term savings target.
- Deciding between saving more and cutting expenses.
- Checking whether your current plan reaches independence on time.
Common Mistakes
- Using an aggressive return rate: A 10% projection shortens the timeline on paper but fails if markets underperform; 6–7% is more realistic.
- Ignoring inflation: The 25x rule uses today expenses; a rising cost of living raises the target over time.
- Forgetting taxes and healthcare: Early retirement means paying for insurance and managing taxable withdrawals, both of which raise the number.
Frequently Asked Questions
What is the FIRE movement and how is the FIRE target set?
FIRE stands for Financial Independence, Retire Early. The target is annual spending multiplied by 25, based on the 4% withdrawal rule. Lower spending lowers the target and speeds the timeline, which is why frugality is central to the approach.
How does the 4% safe withdrawal rate rule work?
The rule says you can withdraw 4% of your portfolio in the first year, adjust for inflation each year, and historically avoid running out over a 30-year retirement. It is a guideline, not a promise, and many early retirees use 3–3.5% for extra safety.
How do inflation assumptions affect early retirement?
Higher inflation raises both your future expenses and the portfolio needed to cover them, pushing the FIRE date later. It also erodes real returns during accumulation. Modeling 2.5–3% inflation keeps the projection honest.
What is the 4 percent rule for retirement calculation?
It says you can withdraw 4% of your portfolio in year one, adjust for inflation annually, and historically avoid running out over 30 years. It implies a 25x expense target. Many early retirees prefer 3% to 3.5% for extra safety.
How do you calculate a safe withdrawal rate in retirement?
Divide your first-year withdrawal by the portfolio balance to get the rate. A 40,000 withdrawal on a 1,000,000 portfolio is 4%. Lower rates are safer for longer retirements. The rate is a planning estimate, not a guarantee, because markets vary.
How This Page Is Reviewed
Written by the Recapflow Editorial Team and last reviewed . Every formula and worked example is cross-checked against the live calculator engine and a hand-worked example. This page is educational and does not replace professional financial, tax, or legal advice.