FIRE Number Calculator
A free, browser-based calculator. Runs entirely in your browser — no sign up, nothing stored.
100% FreeRuns in your browserBasic
Enter Values
Enter your values and press Calculate to see results.
How to use this calculator
- Enter your annual expenses.
- Set the safe withdrawal rate (default 4%).
How it works
FIRE number = annual expenses ÷ (withdrawal rate ÷ 100). At 4% that's 25× expenses.
Worked example
$50,000/year at 4%. = $1,250,000.
Common mistakes
- Forgetting tax and healthcare in your expenses.
- Assuming 4% is guaranteed — it's a guideline, not a promise.
Frequently asked questions
What's the 4% rule?
A guideline that withdrawing ~4% of a portfolio each year is likely to last decades. This is educational, not financial advice.
Related tools
Tip: Enter any known values to calculate the remaining results.
All calculations run in your browser. Your inputs are never saved or transmitted.