Question 1

What is a FIRE number?

Accepted Answer

Your FIRE number is the total savings or investment portfolio you need to retire early and live off investment returns indefinitely. It is typically calculated as 25× your annual expenses, based on the 4% safe withdrawal rate.

Question 2

How do I calculate my freedom date?

Accepted Answer

Your freedom date is the point when your investments can cover your living expenses without needing to work. UntilFire calculates it from your income, monthly savings, current net worth, and target spending, then projects when your portfolio hits 25× annual expenses.

Question 3

What is the difference between lean FIRE, fat FIRE, barista FIRE, and coast FIRE?

Accepted Answer

Lean FIRE means retiring on a minimal budget (typically under $40k/year). Fat FIRE means retiring with a larger portfolio for a comfortable lifestyle. Barista FIRE means partially retiring with part-time work to cover some expenses. Coast FIRE means you have saved enough that, with no further contributions, your portfolio will grow to your FIRE number by traditional retirement age.

Question 4

How much do I need to retire early?

Accepted Answer

You need approximately 25 times your annual expenses invested in a diversified portfolio to retire early — this is known as your FIRE number. For example, if you spend $50,000 per year, you need roughly $1.25 million. UntilFire calculates your exact target based on your location, spending, and tax situation.

Question 5

What savings rate do I need for financial independence?

Accepted Answer

Higher savings rates dramatically shorten the timeline to financial independence. Saving 10% of your income takes roughly 40 years. Saving 25% takes about 32 years. Saving 50% takes around 17 years. Saving 70%+ can get you to financial independence in under 10 years. UntilFire shows your exact timeline based on your current numbers.

Question 6

What is the 4% rule for retirement?

Accepted Answer

The 4% rule states that you can withdraw 4% of your portfolio in the first year of retirement, then adjust for inflation each year, with a high probability of the portfolio lasting 30+ years. It comes from the Trinity Study. This means your FIRE number is 25× your annual expenses (1 ÷ 4% = 25).

Free FIRE calculators that answer the questions people actually search for.

FIRE Calculator

FIRE Number Calculator

Coast FIRE Calculator

Savings Rate Calculator

Compound Interest Calculator

APY Calculator

How these calculators fit together

Compare FIRE math in the cities people actually search for.