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About This Calculator
FIRE stands for Financial Independence, Retire Early, a movement built on aggressive saving and investment to achieve freedom from traditional employment. This calculator estimates how many years until your investment portfolio can sustain your living expenses indefinitely, typically using the 4% safe withdrawal rate. It factors in current savings, income, expenses, and expected market returns.
Quick Tips
- 1 The 4% rule says you can safely withdraw 4% of your portfolio yearly in retirement.
- 2 Multiply your annual expenses by 25 to find your target FIRE savings number.
- 3 Lean FIRE targets essential expenses only while Fat FIRE includes luxuries.
Example Calculation
$48,000 annual expenses, $450,000 saved, saving $2,500/month at 7% return.
FIRE number (25x): $1,200,000 | Years to FIRE: 12.8 years | Safe withdrawal: $48,000/yr
What Is the FIRE Movement?
FIRE stands for Financial Independence, Retire Early. The core principle is achieving a net worth large enough that investment returns can cover your living expenses indefinitely. This is typically defined as 25 times your annual expenses, based on the 4% safe withdrawal rate derived from the Trinity Study. FIRE adherents maximize savings rates and invest aggressively to reach this number as quickly as possible.
The 4% Rule Explained
The 4% rule states that you can withdraw 4% of your portfolio in the first year of retirement and adjust for inflation each subsequent year, with a very high probability of your money lasting 30+ years. Your FIRE number is therefore Annual Expenses × 25. For example, if you spend $50,000 per year, your target is $1,250,000.
Savings Rate Is Everything
Your savings rate — the percentage of income you save — is the most important factor in reaching FIRE. At a 50% savings rate, you can retire in roughly 17 years regardless of income level. At 70%, it drops to about 8-9 years. Increasing savings rate has a double effect: it reduces your expenses (lowering your FIRE number) and increases monthly contributions.
Frequently Asked Questions
Your FIRE number is your annual expenses multiplied by 25. This is based on the 4% safe withdrawal rate — if you withdraw 4% of your portfolio annually, it should last 30+ years. For example, $40,000 in annual expenses means a FIRE number of $1,000,000.
The 4% rule has been debated extensively. Some researchers suggest 3.5% is safer for early retirees with 40-50 year horizons. Others argue that a flexible withdrawal strategy (reducing spending in down markets) makes 4% or even higher viable. The rule is a solid starting guideline.
There are several variations: Lean FIRE (minimal expenses, typically under $40,000/year), Fat FIRE (comfortable lifestyle, $100,000+/year), Barista FIRE (semi-retirement with part-time income covering some expenses), and Coast FIRE (enough saved that you only need to cover current expenses, not save more).
The calculator uses your nominal return rate. For a more conservative estimate, subtract expected inflation (2-3%) from your return rate. For example, use 4-5% instead of 7% to see inflation-adjusted results. The 4% rule itself was designed with inflation adjustments built in.