Your FI number is 25 times your annual expenses — the portfolio size that supports a 4% safe withdrawal rate indefinitely. At $1,000,000 invested, you can withdraw $40,000/year with historically strong probability of never running out. Your specific FI number depends entirely on your expected annual spending in financial independence, not on your income.

What is the 4% rule and is it reliable?

The 4% rule (Bengen 1994) states that withdrawing 4% of your initial portfolio annually, adjusted for inflation, has supported 30-year retirements through all historical US market conditions with 95%+ success. For longer retirements (40-50 years, common in early retirement), many FI planners use 3.25-3.5% to increase safety margin. The rule remains a solid planning framework despite debate about future returns.

Coast FI is the invested balance at which you no longer need to make additional contributions — compound growth alone will carry your portfolio to your FI number by a target retirement age. Reaching Coast FI is a major psychological milestone: you could work part-time, take lower-paying meaningful work, or reduce financial stress significantly, knowing the compounding is already doing the heavy lifting.

Does savings rate really matter more than income?

Yes, dramatically. A 50% savings rate reaches FI in approximately 17 years regardless of income level (as long as expenses are covered). A 10% savings rate takes 43 years at the same income and return assumptions. This is because both the numerator (assets accumulating) and denominator (FI number required) are driven by spending, not income. Reducing spending simultaneously reduces the FI target and increases the savings going toward it.

What is Lean FI vs Fat FI?

Lean FI is financial independence at a minimal lifestyle — your FI number based on bare essential spending. Fat FI is independence with significant lifestyle budget for travel, hobbies, and flexibility. Standard FI uses your current spending. The calculator models all three, since many people find that reaching Lean FI changes their relationship with work even before hitting their full FI number.

🌅Retirement

How Far Are You From Financial Independence?

How far are you from never needing to work again?

What This Does

Financial independence — having enough invested assets to cover your living expenses indefinitely from portfolio returns alone — is achievable at almost any income level. The math is simple: invest 25 times your annual expenses (the FI number), and a 4% annual withdrawal sustains those expenses essentially forever based on historical market returns. What makes the path dramatically shorter or longer is not raw income but savings rate. Someone earning $80,000 who saves 50% of income reaches FI in approximately 17 years starting from zero. Someone earning the same $80,000 who saves only 10% takes approximately 43 years. The savings rate — not the income — is the primary lever. This calculator gives you your FI number, your current progress as a percentage, your years to FI at your current savings rate, and the specific actions that would move your FI date the most. It also models lean FI (minimum comfortable spending), standard FI (current spending), fat FI (comfortable spending with buffer), and coast FI (the amount at which compounding alone carries you to FI without further contributions).

When Should You Use This?

→You want to know your exact FI number — the portfolio size at which you could stop working
→You want to calculate how many years until you reach financial independence at your current savings rate
→You are evaluating whether a lifestyle change (reducing expenses, increasing income) would materially accelerate your FI date
→You want to understand the relationship between savings rate and time to FI
→You want to calculate your Coast FI number — when you can stop contributing and let compounding do the rest
→You are exploring the FIRE movement and want concrete numbers for your specific situation

Example Scenario

Nina, 33, earns $95,000 and spends $55,000/year, saving $40,000 (42% savings rate). She has $85,000 invested. Her FI number is $1,375,000 (25x $55,000). She is 6.2% of the way there. At 42% savings rate with 7% returns, she reaches FI in approximately 14 years at age 47. If she reduces spending by $8,000/year (raising savings rate to 50%), she reaches FI in 12 years at 45. Her Coast FI number — the balance at which she could stop contributing entirely — is $312,000 at her current age.

Financial Independence Calculator

How Far Are You From Financial Independence?

Calculate your FI number, Lean/Fat/Coast FI variants, portfolio growth projection, and the exact impact of changing your savings rate. Results update live as you type.

Your FI Profile

Current Age

Annual Income

Annual Spending

Current Invested Assets

Expected Annual Return

Withdrawal Rate

Lean FI Annual Spending

Fat FI Annual Spending

Coast FI Target Age

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Common Mistakes to Avoid

✕Using current income rather than current expenses to calculate the FI number — the FI number depends on spending, not earnings
✕Not accounting for taxes on withdrawals from pre-tax accounts — your effective FI number from a 401k is higher than 25x expenses
✕Ignoring healthcare costs in the FI calculation — these can be $10,000-$25,000/year before Medicare eligibility
✕Confusing Coast FI with FI — coast FI means you can stop contributing but typically cannot stop working for income
✕Using nominal rather than real returns — FI calculations should use inflation-adjusted returns (typically 5% real) or inflation-adjusted expenses

Frequently Asked Questions