Verified Formula, Methodology & Frequently Asked Questions: FIRE Retirement Number, Coast FIRE & 4% Rule Calculator
Calculate your exact Financial Independence (FIRE) portfolio target, years until work is optional, and safe monthly withdrawal income.
Verified Mathematical Equation: FIRE Number = Target Annual Retirement Spending / Safe Withdrawal Rate (e.g. 0.04 = 25x Annual Expenses)
Frequently Asked Questions (FAQ)
How does the FIRE Retirement Number, Coast FIRE & 4% Rule Calculator work in 2026?
Calculate your exact Financial Independence (FIRE) portfolio target, years until work is optional, and safe monthly withdrawal income. It uses the industry-standard formula (
FIRE Number = Target Annual Retirement Spending / Safe Withdrawal Rate (e.g. 0.04 = 25x Annual Expenses)) and updates your KPIs, visual breakdown bar, and comparison table at 60fps as you type or drag the sliders.How can I share my exact scenario with a client, partner, or spouse?
Click the 🔗 Share Scenario Link button at the top of the page. It encodes every input you entered directly into a custom URL so anyone who clicks your link sees your exact numbers immediately.
Is my financial data private and does this work offline?
Yes—100% of calculations happen locally inside your browser using JavaScript. No personal or financial inputs are ever transmitted to an external database.
Can I embed the FIRE Retirement Number, Coast FIRE & 4% Rule Calculator on my own website or client portal?
Yes! Click </> Embed on Your Site (Free) above to copy a clean, responsive
<iframe> widget that automatically adapts to any screen size.