Free FIRE Number Calculator
Portfolio size needed for financial independence.
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Inputs
Result
FIRE number
$1,200,000.00
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Short answer
Portfolio size needed for financial independence.
What is the FIRE Number Calculator?
Portfolio size needed for financial independence.
How does the FIRE Number Calculator work?
Enter the inputs above and read the result.
Formula
Variables
WRSafe withdrawal rate, commonly 4%
Explanation
At the safe withdrawal rate, the portfolio can theoretically sustain spending indefinitely.
Examples
Applications
Advantages
Limitations
Common mistakes
Tips
Related concepts
The FIRE Number Calculator sits inside the Finance Calculators hub, in the investing & retirement cluster. Growing capital and planning for withdrawal. Understanding the terms below makes the output easier to interpret and easier to compare against neighbouring measures.
Practical use cases and industry applications
Understanding FIRE Number
Portfolio size needed for financial independence. Within finance calculators, fire number belongs to the investing & retirement cluster, where it shares terminology and assumptions with closely related tools.
Learning how fire number is calculated
At the safe withdrawal rate, the portfolio can theoretically sustain spending indefinitely. Working through the variables one at a time — WR — makes the result reproducible by hand and easier to sanity-check.
Using fire number to make a decision
Because outputs depend on the assumptions you enter, run more than one scenario before committing to a figure.
How fire number compares with related measures
compound growth, asset allocation, withdrawal rate, yield all describe adjacent aspects of investing & retirement. Comparing this calculator's output against those measures — using the related tools listed on this page — prevents a single metric from being read in isolation.
Frequently asked questions
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