FIRE Calculator

Use our FIRE calculator to estimate savings, retirement age, and income needed to achieve financial independence and early retirement.

Calculate when you can achieve Financial Independence and Retire Early.

About This Calculator

The FIRE Calculator shows you the path to Financial Independence and Early Retirement. Using the famous 4% safe withdrawal rate, calculate how much you need to save and when you can stop working for money.

The FIRE movement is based on the idea that saving and investing aggressively can allow you to retire decades earlier than traditional retirement age. The 4% rule, derived from the Trinity Study, suggests you can withdraw 4% of your portfolio annually with a high probability of not running out of money over 30+ years.

The FIRE Formula

FIRE Number = Annual Expenses × 25

Safe Withdrawal = Portfolio × 4%

The "25x rule" is simply the inverse of the 4% withdrawal rate.

FIRE Variations

Type	Description
LeanFIRE	Minimal expenses, frugal lifestyle ($40K/year or less)
Regular FIRE	Comfortable middle-class lifestyle ($40-80K/year)
FatFIRE	Luxurious lifestyle ($100K+/year)
BaristaFIRE	Part-time work covers some expenses

Practical Example

Annual expenses of $50,000: FIRE Number = $50,000 × 25 = $1,250,000. With $300,000 saved, investing $3,000/month at 7% return, you'll reach FIRE in about 14 years.

Pro Tips

Reduce expenses to lower your FIRE number dramatically
Consider a 3.5% withdrawal rate for extra safety margin
Plan for healthcare costs before Medicare eligibility (65)
Geographic arbitrage: lower cost-of-living areas speed up FIRE

Scenario Comparison: FIRE Timelines

FIRE Type	Annual Expenses	FIRE Number	Monthly Savings	Years to FIRE*
LeanFIRE	$30,000	$750,000	$2,000	18 years
Regular FIRE	$50,000	$1,250,000	$3,000	21 years
FatFIRE	$100,000	$2,500,000	$5,000	25 years
Coast FIRE	$50,000	$625,000**	$2,000	15 years

*Starting with $100K saved, 7% return. **Coast FIRE: half the target, let it grow to full FIRE while working less.

Common FIRE Mistakes to Avoid

Using exactly 4% withdrawal rate: 4% was designed for 30-year retirement. For 40-50 years, use 3-3.5% for better survival odds.
Ignoring healthcare costs: Pre-Medicare healthcare (under 65) costs $500-1,500/month per person. Add $12-18K/year to expenses.
Underestimating lifestyle inflation: Your expenses today may not reflect retirement. Account for hobbies, travel, and unexpected costs.
Not stress-testing the plan: Use Monte Carlo simulations. What if you retire into a market crash? Have a flexible spending plan.

Safe Withdrawal Rate Benchmarks

Withdrawal Rate	Multiplier	30-Year Success	Best For
3.0%	33.3x expenses	100%	Very early retirees (30-40)
3.5%	28.5x expenses	98%	Early retirees (40-50)
4.0%	25x expenses	95%	Traditional 30-year retirement
4.5%	22.2x expenses	85%	Later retirees with flexibility

When to Use This Calculator vs Others

This calculator: Best for planning early retirement using the 25x expenses rule and tracking progress to FIRE.
Retirement Calculator: Use for traditional retirement planning with Social Security and pension income.
Investment Calculator: Use for detailed investment growth projections with various contribution scenarios.
Savings Calculator: Use to plan and track your savings progress on your path to FIRE.

Related tools: Retirement Calculator for traditional planning, Investment Calculator for growth projections, and Savings Calculator to track progress.

Frequently Asked Questions

How is FIRE number calculated?

FIRE Number = Annual Expenses × 25. This uses the 4% rule: if you can withdraw 4% annually, your portfolio should last 30+ years. $40K expenses = $1M FIRE number.

What is the 4% rule for early retirement?

The 4% rule states you can withdraw 4% of your portfolio in year one, then adjust for inflation. A $1M portfolio allows $40K/year withdrawal with high success probability.

How much do I need to FIRE in 10 years?

Calculate your FIRE number (expenses × 25), then use investment calculator backwards. For $1M in 10 years at 7% return with $0 start, save about $5,800/month.