FIRE Number Calculator — How Much Do You Need to Retire?
Wondering how much you need to retire? Your FIRE number is the portfolio size that lets you live off investments forever without depleting the principal.
FIRE Calculator (Financial Independence)
How It Works
Your FIRE number = annual spending × 25. Spending $60k/year? Your FIRE number is $1.5 million.
The 4% rule (Trinity Study) says you can safely withdraw 4% of your portfolio in year 1, then adjust for inflation, with ~95% success over 30 years.
Lean FIRE ($40k/year spending) = $1M target. Fat FIRE ($120k/year) = $3M. Barista FIRE (part-time work) can be $500k-$750k.
Your FIRE number doesn't include Social Security — it's pure portfolio income. Factor SS in after for additional buffer.
Frequently Asked Questions
What is a FIRE number?
The portfolio balance needed to cover all living expenses from investment returns alone — typically 25× your annual spending based on the 4% rule.
Is FIRE realistic on a normal salary?
Yes, but it requires a high savings rate (40-60%+). Someone saving 50% on a $75k salary can reach FIRE in ~17 years at 7% returns.
What's the difference between lean, fat, and barista FIRE?
Lean FIRE (~$1M) covers bare essentials. Fat FIRE ($2-3M) covers luxury spending. Barista FIRE (~$500-750k) plus part-time work income.
Is the 4% rule still valid in 2024?
Yes for 30-year retirements. For 40+ year retirements, many advisors suggest 3.5% to be safer. Market valuations matter too — high CAPE ratios may warrant lower withdrawal rates.