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Understanding the FIRE Movement

The FIRE movement (Financial Independence, Retire Early) is built on a simple but powerful idea: save aggressively and invest wisely so you can gain financial freedom decades before traditional retirement age.

What Is the 4% Rule?

The 4% rule, derived from the Trinity Study (published in 1998 by three professors at Trinity University), states that you can safely withdraw 4% of your portfolio each year in retirement without running out of money over a 30-year period. To find your FI number, simply multiply your annual expenses by 25 (the inverse of 4%).

For example, if you spend $50,000 per year, your FI number is $50,000 x 25 = $1,250,000.

The Savings Rate Matters More Than Income

Your savings rate is the single biggest factor determining how quickly you reach financial independence. A higher savings rate means you are both spending less (lowering your FI number) and saving more (building your portfolio faster).

At a 7% average return:

• 15% savings rate: ~43 years to FI
• 30% savings rate: ~28 years to FI
• 50% savings rate: ~17 years to FI
• 70% savings rate: ~8.5 years to FI

Doubling your savings rate can more than halve your time to financial independence.

Assumptions to Keep in Mind

This calculator assumes a constant rate of return and consistent annual savings. In reality, markets fluctuate, your income and expenses may change, and inflation will affect your purchasing power. The 4% rule is a guideline, not a guarantee — some early retirees prefer a more conservative 3% or 3.5% withdrawal rate for longer retirements.

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