FIRE / Early Retirement Calculator

What is FIRE?

FIRE stands for Financial Independence, Retire Early. The idea is simple even if the discipline isn't: save and invest a large share of your income until your portfolio is big enough that its returns cover your living costs. At that point, work becomes optional. People chasing FIRE typically aim to save anywhere from 25% to 60%+ of their take-home pay — far above the single-digit rates most households manage.

The number that matters most is your savings rate, not your income. Someone earning a modest salary who saves half of it can reach independence faster than a high earner who spends almost everything. That's why this calculator asks for your annual spending and how much you invest, rather than obsessing over your gross salary.

The 4% rule and your FIRE number

Your FIRE number is the portfolio size that can fund your lifestyle indefinitely. The classic shortcut comes from the 4% rule: if you withdraw about 4% of your portfolio in the first year of retirement and adjust for inflation after that, historically your money had a strong chance of lasting 30+ years. Flip that around and the math is clean:

FIRE number = Annual spending ÷ Withdrawal rate

At a 4% withdrawal rate, that's the same as multiplying your annual spending by 25. Spend $40,000 a year? Your FIRE number is $1,000,000. Prefer a more cautious 3.5% rate (roughly 28.5× spending)? The target rises to about $1,143,000. Our guide to the 4% rule digs into where the number comes from and its limits.

A worked example

Say you're 30 years old, spend $40,000 a year, have $50,000 invested, and add $2,000 a month. Using a 4% withdrawal rate, your FIRE number is $1,000,000. Assuming a 5% real return (after inflation), the calculator above shows you'd cross that line in about 20 years — around age 51. Push your contribution to $3,000/month and you reach it in roughly 16 years, near age 47. That sensitivity to your savings rate is the whole game.

Flavors of FIRE

• Lean FIRE: financial independence on a deliberately frugal budget.
• Fat FIRE: a larger portfolio that funds a comfortable, higher-spending lifestyle.
• Coast FIRE: you've invested enough early that, even without adding another dollar, growth alone will fund retirement at a normal age.
• Barista FIRE: you cover part of your costs with light or part-time work, letting a smaller portfolio do the rest.

Whichever version fits you, the levers are the same: spend less, earn and invest more, and give compounding time to work. To see how relentless that compounding can be, try our compound interest calculator, and read the full FIRE movement guide for strategy.

How to reach FIRE faster

• Raise your savings rate. Every extra percentage point you invest does double duty: it grows your portfolio and lowers the spending your portfolio must eventually cover.
• Keep costs low. Cheap, broad index funds leave more return in your pocket than high-fee products.
• Use tax-advantaged accounts so more of your money compounds instead of leaking to taxes each year.
• Protect the plan with an emergency fund so you never have to sell investments at the worst possible time.