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Fat FIRE Calculator
Retire comfortably with extra margin
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Your Fat FIRE Number
$1,800,000
FI Age
69
Time Left
39 years
Budget
$72K/yr
Investing $1,500 a month, you reach Fat FIRE at age 69. From then on, 4% withdrawals cover $72,000 a year.
Portfolio Projection
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Year-by-Year Breakdown
| Age | Contributions | Growth | Withdrawals | End Balance | FIRE % | Phase |
|---|---|---|---|---|---|---|
| 30 | $18,000 | $1,942 | -- | $69,942 | 2.8% | Saving |
| 31 | $18,000 | $2,716 | -- | $90,658 | 3.9% | Saving |
| 32 | $18,000 | $3,521 | -- | $112,179 | 5.0% | Saving |
| 33 | $18,000 | $4,356 | -- | $134,535 | 6.2% | Saving |
| 34 | $18,000 | $5,225 | -- | $157,760 | 7.5% | Saving |
| 35 | $18,000 | $6,127 | -- | $181,887 | 8.8% | Saving |
| 36 | $18,000 | $7,064 | -- | $206,951 | 10.1% | Saving |
| 37 | $18,000 | $8,037 | -- | $232,988 | 11.5% | Saving |
| 38 | $18,000 | $9,048 | -- | $260,036 | 12.9% | Saving |
| 39 | $18,000 | $10,098 | -- | $288,134 | 14.4% | Saving |
By the Coast FIRE Calculator editorial team · Methodology · Official source: SEC Investor.gov compound-interest calculator · Corrections: hello@coastfirecalculator.io
What is Fat FIRE?
Financial independence with enough savings to support a comfortable, even luxurious retirement lifestyle.
Unlike Lean FIRE, which focuses on frugality, Fat FIRE provides a generous spending budget that includes travel, dining, hobbies, and a substantial buffer for unexpected expenses.
Fat FIRE Number by Spending Level
Your Fat FIRE number depends on your target spending and safe withdrawal rate. Here's what Fat FIRE looks like at different annual spending levels with a 4% SWR:
$100,000/year
$2,500,000
$150,000/year
$3,750,000
$200,000/year
$5,000,000
Use the calculator above to find your specific Fat FIRE number based on your current spending, savings rate, and expected returns. The Coast FIRE Calculator can show you when compound growth alone will carry you to these targets.
Comparing FIRE Types
~60% of normal spending ($28,800/year on $48K base)
$720,000
Regular FIRE
Normal spending ($48,000/year)
$1,200,000
Fat FIRE
~150% of spending ($72,000/year)
$1,800,000
Growth reference: SEC Investor.gov compound-interest calculator separates starting investment, contributions, assumed interest and time. It is not evidence for a guaranteed withdrawal rate or return.