How to Calculate Your FIRE Number: A Complete Guide
Learn how to calculate your Financial Independence Retire Early (FIRE) number using the 4% rule and plan your path to early retirement.
What is a FIRE Number?
Your FIRE number is the amount of money you need to have invested to live off your portfolio indefinitely. It's the cornerstone of the Financial Independence, Retire Early (FIRE) movement.
The concept is simple: once your investment portfolio reaches a certain size, you can withdraw a small percentage each year to cover your living expenses without ever running out of money.
The 4% Rule Explained
The 4% rule, derived from the Trinity Study, suggests that you can safely withdraw 4% of your portfolio annually without depleting it over a 30-year retirement. This means:
FIRE Number = Annual Expenses × 25
For example:
- If you spend $40,000/year → FIRE number is $1,000,000
- If you spend $60,000/year → FIRE number is $1,500,000
- If you spend $100,000/year → FIRE number is $2,500,000
Types of FIRE
Lean FIRE
Living frugally with annual expenses of $20,000-$40,000. FIRE number: $500,000-$1,000,000.
Regular FIRE
A comfortable lifestyle with $40,000-$100,000 annual expenses. FIRE number: $1,000,000-$2,500,000.
Fat FIRE
A luxurious retirement with $100,000+ annual expenses. FIRE number: $2,500,000+.
Coast FIRE
Having enough invested that compound growth will carry you to traditional retirement age without additional contributions.
How to Calculate Time to FIRE
The time it takes to reach your FIRE number depends on:
- Your current savings
- Your monthly contributions
- Expected investment returns
- Your target FIRE number
Use our FIRESpark calculator to run these numbers instantly and see projections for different scenarios.
Tips to Reach FIRE Faster
- **Increase your savings rate** - The higher your savings rate, the faster you reach FIRE
- **Reduce expenses** - Lower expenses means a lower FIRE number
- **Invest consistently** - Dollar-cost averaging smooths out market volatility
- **Maximize tax-advantaged accounts** - Use 401k, IRA, and HSA accounts
- **Avoid lifestyle inflation** - As income grows, keep expenses stable
Start Your FIRE Journey Today
Calculate your personal FIRE number and timeline with our free FIRE calculator. Simply enter your current savings, monthly contributions, and expenses to see when you could achieve financial independence.