What Is the FIRE Calculator?
A FIRE calculator estimates the portfolio size and timeline needed to reach financial independence and retire early. FIRE — Financial Independence, Retire Early — uses the 4% rule to translate your annual expenses into a target nest egg.
How to use this calculator
Type your numbers into the fields above. The results change the moment you edit any input, so you can try one scenario after another and see exactly what moves. Most calculators show a short summary of the key figures, a line-by-line breakdown underneath, and — where it applies — a year-by-year schedule you can export to a spreadsheet. Everything runs in your browser; nothing is stored or sent anywhere. Treat the output as a planning estimate, not as final word on a real decision.
The Formula
FIRE number = annual expenses ÷ withdrawal rate (e.g., 4% → 25× expenses). Years to reach it simulates growing current savings plus annual contributions at your expected return until the portfolio hits the target.
Worked Example
With $40,000 of annual expenses and a 4% withdrawal rate, your FIRE number is $1,000,000. Starting from $50,000 and adding $20,000 a year at 7% return, you could reach it in roughly 18 years.
Tips for the Most Accurate Estimate
- Lower expenses directly lowers your FIRE number.
- A higher savings rate shortens the timeline fastest.
- The 4% rule assumes a balanced portfolio and 30-year retirement.
- Consider a lower withdrawal rate for longer early retirements.
- Keep an emergency buffer outside the FIRE portfolio.
Frequently Asked Questions
Q: What is the 4% rule?
It suggests you can withdraw 4% of your portfolio in the first year of retirement and adjust for inflation thereafter, with a high historical success rate over 30 years.
Q: Is the FIRE number guaranteed?
No. It is a planning heuristic based on historical market returns; a longer retirement or poor sequence of returns may require a lower withdrawal rate.
Q: How do I retire sooner?
Spend less (lowers the target), save more (reaches it faster), or accept a slightly higher withdrawal rate for more risk.