FIRE Calculator
Fat FIRE Calculator
Estimate the portfolio target and potential date for reaching financial independence with a higher annual spending goal.
Use the Fat FIRE Calculator
Your results
- Fat FIRE number
- $0.00
- Amount still needed
- $0.00
- Estimated years to Fat FIRE
- 0 years
- Estimated Fat FIRE date
- Not calculated
Year-by-Year Projection
How this calculator works
- What it does
- Estimate the portfolio target and potential date for reaching financial independence with a higher annual spending goal.
- Inputs used
- The estimate uses target annual spending, withdrawal rate (%), current invested assets, monthly contribution, and expected annual return (%).
- Calculation approach
- The calculator applies the relationships defined for the fat fire calculator to those inputs and updates fat fire number, amount still needed, estimated years to fat fire, and estimated fat fire date.
- How to read the result
- Treat the result as a scenario based on the values entered. Compare a few reasonable inputs and consider costs, taxes, timing, or risks that the calculator does not include.
How to Use This Calculator
- Enter Target annual spending and Withdrawal rate (%) using values that match the scenario you want to evaluate.
- Enter Current invested assets and Monthly contribution using values that match the scenario you want to evaluate.
- Enter Expected annual return (%) using values that match the scenario you want to evaluate.
- Review the assumptions for the fat fire calculator, especially rates, time periods, and optional amounts.
- Select Calculate to update the results, then adjust one input at a time to compare scenarios.
Understanding the Results
- Fat FIRE number
- The target amount calculated from the spending, rate, or goal assumptions entered above.
- Amount still needed
- The difference between the current position and the calculated target or comparison value.
- Estimated years to Fat FIRE
- The estimated time needed to reach the target under the current contribution, payment, and growth assumptions.
- Estimated Fat FIRE date
- The estimated time needed to reach the target under the current contribution, payment, and growth assumptions.
Common Mistakes
- Treating a constant return or withdrawal rate as a guaranteed outcome.
- Leaving out inflation, taxes, fees, healthcare, or irregular retirement expenses.
- Using current spending without considering how expenses may change later.
- Relying on one scenario instead of testing more cautious assumptions.
Worked Example
Example inputs
- Target annual spending
- $120,000
- Withdrawal rate (%)
- 4%
- Current invested assets
- $500,000
- Monthly contribution
- $5,000
- Expected annual return (%)
- 7%
Example results
- Fat FIRE number
- $3,000,000.00
- Amount still needed
- $2,500,000.00
- Estimated years to Fat FIRE
- 15 years
With these illustrative inputs, the estimated years to fat fire is 15 years. The timeline is an estimate based on the stated assumptions, not a prediction or guarantee.
Frequently asked questions
What is Fat FIRE?
Fat FIRE is financial independence with a higher spending target intended to support greater lifestyle flexibility, travel, housing, health care, or other discretionary costs.
How is the Fat FIRE number calculated?
The calculator divides target annual spending by the withdrawal rate as a decimal. At a 4% withdrawal rate, $120,000 of annual spending requires a $3 million portfolio.
How is the estimated Fat FIRE date calculated?
Current investments and monthly contributions are projected with monthly compounding until they reach the calculated Fat FIRE number.
What withdrawal rate should I use for Fat FIRE?
Many plans use 4% as a starting point, but longer retirements or less flexible spending may call for a lower rate. Test several rates and include taxes and fees in your plan.
Should inflation be included in my spending target?
Yes. Express your target in today’s dollars and revisit it regularly. This calculator uses constant inputs, so it does not separately model future inflation or changing expenses.
What does the Fat FIRE Calculator calculate?
Estimate the portfolio target and potential date for reaching financial independence with a higher annual spending goal. The result is based only on the inputs and assumptions shown on the page.
How should I interpret the estimated years to fat fire from the Fat FIRE Calculator?
Use it as an estimate for the scenario entered, not as a guarantee or personal recommendation. Test changes to target annual spending, withdrawal rate (%), and current invested assets to see which assumptions have the greatest effect.