FIRE Calculator: Find Your Number to Retire Early
How much do you need to retire early? This FIRE calculator (Financial Independence, Retire Early) finds your FIRE number and how long it could take to reach it. Enter your expected yearly spending, a withdrawal rate, what you have invested and how much you add each month.
Quick answer
Your FIRE number is yearly spending ÷ withdrawal rate. At the classic 4% rule that is 25 times your spending: $40,000 a year needs about $1,000,000. With $50,000 invested and $1,500 a month at 7%, you could reach it in about 20 years and 3 months.
How the FIRE calculator finds your number
FIRE number = yearly spending ÷ withdrawal rate At 4%: FIRE number = yearly spending × 25
The 4% figure comes from studies of past market returns for 30-year retirements. Early retirees often plan for 40 or 50 years, so many use a lower rate, such as 3.5%, for extra safety.
FIRE numbers by spending
| Yearly spending | At 4% (25x) | At 3.5% |
|---|---|---|
| $30,000 | $750,000 | $857,143 |
| $40,000 | $1,000,000 | $1,142,857 |
| $60,000 | $1,500,000 | $1,714,286 |
| $80,000 | $2,000,000 | $2,285,714 |
How to reach FIRE faster
- Raise your savings rate: doubling the monthly investment from $1,500 to $3,000 cuts the time from about 20 to about 14 years in the example.
- Lower your spending: it shrinks your FIRE number and frees money to invest at the same time.
- Keep fees and taxes low: use tax-advantaged accounts first.
- Consider Coast FIRE or part-time work: see the Coast FIRE calculator.
Risks of retiring early
- Health insurance before Medicare at 65 can be expensive.
- A market drop early in retirement can hurt more than one later (sequence-of-returns risk).
- Withdrawals from retirement accounts before 59½ may face penalties, with exceptions.
- Inflation can rise faster than expected.
What the FIRE calculator means for you
- Your spending is the most important number: it sets your target.
- A lower withdrawal rate is safer for long early retirements.
- Even if you never retire early, building toward FIRE gives you more freedom.
Frequently asked questions
What is a FIRE number?
The amount you need invested so that withdrawals can cover your yearly spending, often 25 times spending at a 4% withdrawal rate.
Is the 4% rule safe for early retirement?
It was based on 30-year periods. For 40 to 50 years, many people use 3% to 3.5% to add a safety margin.
Does the FIRE number include Social Security?
Not by default. Expected Social Security can reduce how much you need later, but early retirees must bridge the years before it starts.
How long does it take to reach FIRE?
It depends mostly on your savings rate. In the example, $1,500 a month plus $50,000 at 7% takes about 20 years.
What return should I use?
Use a cautious long-term estimate and test several. Returns are not guaranteed.
Related guides and calculators
Sources
- Investor.gov (U.S. SEC): Compound interest calculator
- Social Security Administration
- IRS: Retirement plans
- MonetaryReports: How we calculate
This guide is for educational purposes only and is not financial advice. The figures are estimates before taxes, fees and inflation, and real rates, returns and rules change over time.
