🧮 Calculate Your FIRE Number

Your FIRE Number
$1,250,000
Years to FIRE 14.2 years
FIRE Age Age 44
Monthly Withdrawal in Retirement $4,167/mo
Current Progress 8.0%
Portfolio at Retirement —
Progress to FIRE 8.0%

How the FIRE Number Calculator Works

Your FIRE number is the total amount of invested assets you need so that you can live off the returns indefinitely — without ever needing to work for money again. This calculator determines your number using two key inputs:

The FIRE Number Formula

FIRE Number = Annual Expenses ÷ Safe Withdrawal Rate

At a 4% withdrawal rate: $50,000 ÷ 0.04 = $1,250,000

The calculator then projects how long it will take to reach that number based on your current savings, annual contributions, and expected investment returns using compound growth:

Input Definitions

  • Annual Expenses: Your total yearly spending in retirement. Include housing, food, healthcare, insurance, travel, and discretionary spending.
  • Safe Withdrawal Rate: The percentage of your portfolio you withdraw per year. 4% is standard (25× multiplier); 3.5% is more conservative (28.6× multiplier).
  • Current Invested Savings: The total amount you currently have invested in retirement and brokerage accounts (401k, IRA, HSA, taxable).
  • Annual Investment Contribution: How much you add to investments each year.
  • Expected Real Return: Your anticipated inflation-adjusted annual return. 7% is a common assumption for a stock-heavy portfolio based on historical US market averages.
  • Current Age: Your age today, used to calculate your projected FIRE age.

What Safe Withdrawal Rate Should You Use?

SWR Multiplier $40K Expenses $60K Expenses $80K Expenses Best For
4.0%25×$1.00M$1.50M$2.00M30-year retirements
3.5%28.6×$1.14M$1.71M$2.29M40-year retirements
3.25%30.8×$1.23M$1.85M$2.46M50+ year retirements
3.0%33.3×$1.33M$2.00M$2.67MUltra-conservative

Rule of Thumb

If you're retiring before age 40, consider using 3.5% or lower. If retiring at 50+, the traditional 4% rate has strong historical support. The difference between 4% and 3.5% is meaningful — it adds roughly 14% more to your target number.

Strategies to Reach Your FIRE Number Faster

  1. Increase your savings rate — The single most impactful lever. See our savings rate guide.
  2. Reduce annual expenses — Lowering spending by $5,000/year reduces your FIRE number by $125,000 (at 4% SWR).
  3. Maximize tax-advantaged accounts — 401(k), IRA, HSA each reduce your tax burden and accelerate growth.
  4. Increase income — Side hustles, career growth, and job hopping can dramatically increase your contribution rate.
  5. Optimize housing costs — Housing is typically 30%+ of expenses. House hacking, downsizing, or relocating can shave years off your timeline.

Frequently Asked Questions

Your FIRE number is the total investment portfolio value you need to retire early and live off investment returns indefinitely. It's calculated as your annual expenses multiplied by 25 (based on the 4% withdrawal rate). For example, $50,000 in annual expenses means a FIRE number of $1,250,000.

Typically no — FIRE numbers assume you're self-funding retirement entirely from investments. Social Security (if you qualify) acts as a bonus safety net starting at age 62+. Some FIRE practitioners reduce their long-term target by their expected Social Security benefit, but most prefer to plan without it as a conservative measure.

No. Your FIRE number should only include invested assets that generate returns you can withdraw from — stocks, bonds, index funds, rental properties generating income. Your primary residence doesn't produce income (unless you plan to sell it and downsize as part of your strategy).

A 7% real (inflation-adjusted) return is the most common assumption, based on historical US stock market averages. For a more conservative estimate, use 5-6%. If your portfolio includes significant bond allocation, 5% real may be more realistic. The calculator uses real returns, so the results are in today's dollars.

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