FIRE Calculator United States

FIRE stands for Financial Independence, Retire Early: the point where your invested savings can cover your living costs without a paycheck. This FIRE calculator works out how large your portfolio needs to be and how long it will take to build. Enter your yearly spending, what you have saved today and what you add each month.

How your FIRE number is calculated

The FIRE number is the portfolio whose returns can pay your bills each year without being used up. Divide your annual expenses by a safe withdrawal rate; at 4%, that is the same as multiplying your spending by 25. Someone who spends $40,000 a year needs $1,000,000, and someone who spends $60,000 needs $1,500,000. Lower spending means a smaller target, which is why frugality matters so much in FIRE planning.

The 4% rule and safe withdrawal rates

The 4% figure comes from research into how much a retiree could withdraw each year without running out of money: withdraw 4% in year one, adjust for inflation after that, and a balanced portfolio historically lasted through most 30-year periods. A withdrawal rate is the inverse of a savings multiple: 4% means 25 times expenses, 3.5% about 29 times, and 3% about 33 times. If you retire young and expect forty or fifty years of retirement, 3% to 3.5% gives extra protection against poor returns early on, at the cost of a larger target.

How long it takes to get there

The calculator projects your balance month by month from your current savings, applying your expected annual return divided by twelve and adding your monthly contribution, until the balance passes your FIRE number. Your savings rate and your return move the timeline most. Adding a few hundred dollars a month, or cutting expenses so you save more and need less, can take years off the date. In the later years, investment growth starts to outweigh new contributions.

A worked example

Suppose you spend $40,000 a year, have $50,000 invested, add $2,000 a month, and expect a 7% annual return. At 4% your FIRE number is $1,000,000, and the balance passes it in a little under 18 years. At $3,000 a month you would get there in about 14 years. At a 3% withdrawal rate the target rises to about $1,333,000 and the date moves later.

Why your savings rate matters more than your return

While you are still building toward FIRE, the share of income you save and invest is usually the stronger lever, and the one you control. Saving more adds money each month and, because you live on less, lowers the FIRE number. Cutting $500 a month of spending frees $500 to invest and removes $150,000 from a FIRE number at the 4% rule. Returns are largely outside your control and vary from year to year, so a plan built on a modest return and a high savings rate is more dependable.

Different types of FIRE

Lean FIRE means a bare-bones budget, often under $40,000 a year, which keeps the target small but leaves little slack. Fat FIRE funds a generous budget for travel, larger housing and comfort, which pushes the number well past a million. Coast FIRE is a milestone: the point where your existing investments will grow to cover retirement on their own, so your income only has to cover current expenses. Barista FIRE uses part-time income, often for health benefits, to cover part of the budget while the portfolio covers the rest. Change the expenses input to see each type’s number and timeline.

Common mistakes to avoid

The most common error is underestimating retirement spending. Health care that an employer now subsidizes becomes a large personal cost for early retirees long before Medicare, and irregular costs like a new roof or car do not show up in a monthly budget. Another is treating the 4% rule as a guarantee; a retirement of forty years or more faces more sequence-of-returns risk than the 30-year periods it was tested on, which is why many early retirees use 3% to 3.5%. Withdrawals from a traditional 401(k) or IRA are taxed as income, so a $40,000 spending target may require withdrawing more than $40,000. And a nominal return makes the timeline look better than it is; enter a real, after-inflation return for a figure in today’s money.

Assumptions and limitations

This is a planning estimate. It uses one steady nominal return every year, while real markets are volatile and the order of good and bad years matters; poor returns just after you retire are the main risk the 4% rule guards against. The model ignores taxes, fees and inflation, so for a real-terms plan enter a return net of inflation and budget separately for tax on withdrawals. It also assumes your contributions and expenses stay level. Revisit it as your income, spending and markets change.

About This FIRE Calculator

Use this FIRE calculator to get an instant estimate based on the figures you enter. Adjust the inputs above to match your situation, or browse all our calculators to plan your next step.