Financial Independence Calculator

This Financial Independence calculator estimates when you can stop working based on your income, savings rate, and investment growth. Here's how to use it effectively:

1. Enter your current age and target retirement age. Your current age sets the starting point. The target retirement age is aspirational — the calculator will tell you if your savings rate supports it, or how long it will actually take.
2. Enter your annual income. Use your gross or net income depending on how you think about your savings. The calculator uses this to determine your annual expenses (income minus savings).
3. Set your savings rate. This is the percentage of income you save and invest each year. A 20% savings rate is a solid baseline; FIRE practitioners often target 50% or higher. The calculator shows how dramatically this affects your timeline.
4. Set your expected annual return. This is your investment portfolio's average annual growth. Use 7% for an all-stock portfolio (historical real return) or 5-6% for a balanced portfolio. Lower estimates are more conservative.
5. Set inflation. Inflation erodes purchasing power over time. The calculator adjusts your FI number to account for inflation, so your future portfolio covers expenses at tomorrow's prices, not today's.
6. Explore scenarios. Switch between Lean FI (70% expenses), Standard FI (100%), Fat FI (150%), and Coast FI to see how different lifestyle assumptions change your timeline and required portfolio size.

The chart shows your projected net worth growing toward the FI target line. When the net worth line crosses the target, you reach financial independence.

What Is Financial Independence?

Financial independence (FI) means your investment portfolio generates enough passive income to cover your living expenses indefinitely, without needing to work. The FIRE movement (Financial Independence, Retire Early) applies this concept to retire decades earlier than the traditional age of 65. FI doesn't necessarily mean stopping work — it means work becomes optional.

The FI Number and the 4% Rule

Your FI number is the portfolio size that can sustain your expenses through withdrawals. The most common method uses the "4% rule" — based on the Trinity Study, which found that withdrawing 4% of your portfolio annually (adjusted for inflation) historically survived 30-year retirement periods. This means your FI number is 25x your annual expenses. If you spend $40,000/year, your FI number is $1,000,000.

Why Savings Rate Matters More Than Income

Savings rate has a double effect: it increases the money flowing into investments AND reduces the expenses your portfolio must cover. Someone earning $50,000 with a 50% savings rate ($25,000 expenses, FI number $625,000) reaches FI far faster than someone earning $200,000 with a 10% savings rate ($180,000 expenses, FI number $4,500,000). Time to FI is primarily driven by savings rate, not absolute income.

Lean, Standard, Fat, and Coast FIRE

These variants reflect different lifestyle assumptions. Lean FIRE targets a frugal retirement (70% of current expenses) — smaller portfolio, faster timeline. Standard FIRE maintains your current lifestyle exactly. Fat FIRE allows for increased spending in retirement (150% of expenses) — larger portfolio, longer timeline. Coast FIRE is the point where your existing investments will grow to your FI number on their own by traditional retirement age, even if you stop saving entirely. After reaching Coast FI, you only need to cover current expenses.

The Role of Investment Returns

Higher returns accelerate your path to FI, but don't count on outsized performance. A portfolio of low-cost index funds matching broad market returns (historically 7% real) is a reliable baseline. Chasing higher returns often means higher risk and volatility, which introduces uncertainty into your timeline. The most reliable lever you control is your savings rate.