Find your real FIRE number.

The 4% rule says you can withdraw 4% of your portfolio in your first year of retirement, then adjust that dollar amount for inflation every year after, without running out of money over a roughly 30-year retirement. It comes from historical U.S. market backtesting and is the shortcut behind the "25× expenses" FIRE number: divide your annual spending by 4% (or multiply by 25) to get your target portfolio. Real Fire Calculator does not use it as the definition of your FIRE number; it uses it as a safety cap on your first-year withdrawal, and builds the number itself from your own retirement horizon and returns.

Because 25× is a perpetuity: it quietly assumes you retire forever, at a fixed 4% draw, regardless of whether you retire at 40 or 60 and regardless of what your portfolio actually earns after you stop working. Those are your two biggest variables, and the multiple ignores both. This calculator instead computes the corpus that funds your inflation-adjusted spending every month from your retirement age to your life expectancy at your own post-FIRE return, then adds your emergency buffer and any one-time goals you'll fund after retiring. A longer retirement or a lower post-FIRE return pushes your number above 25×; a shorter one pulls it below. When pure horizon math would have you withdrawing more than your stated safe withdrawal rate in year one, we hold the target at that cap instead, and the result tells you which of the two decided your number.

A FIRE calculator is a tool that estimates how much you need saved, and how long it will take to get there, to reach Financial Independence, Retire Early. Real Fire Calculator takes your income, expenses, savings rate and return assumptions and projects a full wealth trajectory to your FIRE number, updating instantly as you adjust any input.

At a 4% withdrawal rate, $1,000,000 supports $40,000 of annual spending, adjusted for inflation each year, and is designed to last 30+ years without depleting the portfolio, assuming a diversified stock and bond mix and historical U.S. market returns. A run of poor returns early in retirement can shorten that; a lower withdrawal rate or flexible spending adds a safety margin.

No. A 7% withdrawal rate is well above what the historical data supports; research on 30-year safe withdrawal rates, starting with the Trinity Study, puts the safer figure closer to 4%. Withdrawing 7% a year meaningfully raises the odds of running out of money, especially if a downturn hits early in retirement. 7% is more commonly cited as an expected long-run market return, not a withdrawal rate.

The 4% figure comes from the Trinity Study (1998) and later research, which tested withdrawal rates against nearly a century of historical U.S. stock and bond returns, including the worst 30-year stretches like the Great Depression and 1970s stagflation. 4% was roughly the highest rate that survived nearly every historical 30-year period without the portfolio hitting zero, which is why it became the standard "safe" starting point.

Start with how long your retirement actually is: your life expectancy minus the age you want to stop working. Then work out the corpus that funds your annual spending, rising with inflation, across every month of that span while the remainder keeps earning your post-retirement return. Add an emergency buffer and the cost of any one-time goals you'll pay for after retiring. That total is your FIRE number. Finally, check how long your current savings and monthly contributions, compounding at your expected return, take to reach it. This calculator does all of that live as you type, and sanity-checks the result against your safe withdrawal rate so the plan keeps a cushion for a bad first decade of returns.

Retiring by 40 means maximizing the two levers you control: savings rate and time. In practice that means keeping expenses well below income, investing the difference consistently, increasing contributions with every raise, and starting as early as possible so compounding has decades to work. Run your own income, expenses and current savings through the calculator above to see whether your trajectory actually lands at 40, and what changes if it doesn't.

It depends entirely on your expenses, income and how many years you have until you want to retire; there's no single number that's "good" for everyone. $100k by 40 is a meaningful head start if your expenses are modest and you have 20+ years of runway for compounding, and less far along the path if you're aiming for early retirement with high spending. Plug your own figures into the calculator to see your actual trajectory rather than benchmarking against a generic milestone.

Yes, if your savings, expected returns and spending plan support it, which is exactly what this calculator is built to check. Early retirement is a function of your savings rate and time horizon more than your income alone: someone saving 50%+ of their income can often reach FIRE in 15–20 years. Enter your numbers above to see your specific FIRE age.

The best FIRE calculator doesn't start from the textbook 25× shortcut at all: it sizes your corpus to your own retirement horizon and post-FIRE return, uses real, inflation-adjusted figures, lets you model a savings step-up as your income grows, funds one-time goals like a home or a wedding from the same portfolio, and shows you the arithmetic instead of a single opaque number. Real Fire Calculator breaks the headline into its spending corpus, emergency buffer and post-retirement goals, tells you the first-year withdrawal rate your plan implies, and grades every other figure on the page against that same target. Live in the browser, free, no signup required.

Your FIRE amount is the present value of your retirement, not a multiple of your salary or your spending. Take your annual expenses, hold them constant in real terms, and discount them across every month between your retirement age and your life expectancy at your post-retirement return net of inflation. For example, $50,000 a year from age 50 to 90, with a 5% post-FIRE return against 3% inflation, needs about $1.39 million rather than the $1.25 million a flat 25× would suggest, because a 40-year retirement is far longer than the 30 years the 4% rule was tested on. Add your emergency buffer and any post-retirement one-time goals to get the full number. This calculator shows you that breakdown line by line.

The Dave Ramsey retirement calculator (Ramsey Solutions' investment calculator) typically assumes a 12% average annual return and models withdrawal rates as high as 8% in retirement, both well above what most independent researchers, including the Trinity Study, consider sustainable over a 30-year retirement. Real Fire Calculator takes a more conservative approach: it defaults to a 7% pre-retirement return, a de-risked 5% once you've stopped earning, 3% inflation, and a 4% cap on your first-year withdrawal. It also sizes the target to your actual retirement length rather than a fixed multiple, which matters most for people retiring early and spending 40+ years drawing down. Compared to the Ramsey retirement calculator, expect a longer runway but a projection built on assumptions closer to historical market data. Every rate is editable, so you can plug in his assumptions yourself and see exactly how much the difference matters.