FIRE Number Calculator
Find out exactly how much you need to retire early, how long it will take, and what monthly savings rate gets you there.
4% is the classic "Trinity Study" rate used by most FIRE planners.
Your FIRE Number
$1,250,000
the nest egg you need to retire
🔥 FIRE Timeline
At your current savings rate, you can reach financial independence in 25 years. Your portfolio will then support $50,000/year indefinitely using the 4% withdrawal rate.
Portfolio Growth Toward Your FIRE Number
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What Is the FIRE Movement?
FIRE stands for Financial Independence, Retire Early. The movement is built on a simple premise: by saving and investing an unusually high percentage of your income, you can build a portfolio large enough to live off investment returns — often decades before the traditional retirement age of 65.
How to Calculate Your FIRE Number
Your FIRE number uses the 4% Safe Withdrawal Rate from the Trinity Study:
FIRE Number = Annual Expenses ÷ Withdrawal Rate
- $40,000/year expenses ÷ 4% = $1,000,000 FIRE number
- $60,000/year expenses ÷ 4% = $1,500,000 FIRE number
- $80,000/year expenses ÷ 4% = $2,000,000 FIRE number
The Different Types of FIRE
| Type | Annual Spending | Lifestyle | FIRE Number (4%) |
|---|---|---|---|
| Lean FIRE | Under $40,000 | Frugal, minimalist | Under $1M |
| Regular FIRE | $40,000–$80,000 | Comfortable | $1M–$2M |
| Fat FIRE | Over $100,000 | Generous, travel-heavy | $2.5M+ |
| Barista FIRE | $30,000–$50,000 | Part-time work covers some expenses | $750K–$1.25M |
| Coast FIRE | Any | Stop investing; let portfolio grow to FIRE number | Varies |
The Math Behind Savings Rate and Time to FIRE
Your savings rate is the single biggest lever in your FIRE timeline. Here's the relationship:
| Savings Rate | Years to FIRE (7% return) |
|---|---|
| 10% | ~43 years |
| 25% | ~32 years |
| 40% | ~22 years |
| 50% | ~17 years |
| 60% | ~12 years |
| 75% | ~7 years |
This is why FIRE practitioners focus relentlessly on increasing income and cutting expenses — both raise the savings rate simultaneously.
Is the 4% Rule Safe for Early Retirement?
The Trinity Study tested 30-year retirement periods. For early retirees with 40-50 year horizons, many financial planners recommend a 3-3.5% withdrawal rate for extra safety. This increases your required FIRE number but significantly reduces sequence-of-returns risk.
How Much Do I Need to Retire at 40?
If your annual expenses are $50,000 and you want to retire at 40 using the 3.5% withdrawal rate: $50,000 ÷ 0.035 = $1.43 million. At a 7% average return, a 30-year-old saving $2,000/month starting with $50,000 would reach this in approximately 22 years — retiring at 52.
Steps to Reach FIRE Faster
- Maximize tax-advantaged accounts first: 401(k), Roth IRA, HSA. These shelter growth from taxes and accelerate compounding.
- Invest in low-cost index funds: A 1% expense ratio vs 0.03% (like VTSAX) costs you hundreds of thousands over 30 years.
- Increase income aggressively: Side hustles, career advancement, and skills development raise your savings rate faster than cutting expenses alone.
- Track net worth monthly: What gets measured gets managed. Use our Net Worth Calculator to benchmark progress.
- Consider geo-arbitrage: Living in a lower cost-of-living area or country can cut your FIRE number by 30-50%.
Frequently Asked Questions
What does FIRE stand for?
FIRE stands for Financial Independence, Retire Early — a movement focused on achieving investment-supported retirement decades before the traditional age of 65.
How much do I need to retire at 45?
Using the 3.5% rule for a long retirement, you need roughly 28.5× your annual expenses. If you spend $60,000/year, that's approximately $1.71 million.
Is the FIRE movement realistic for average earners?
Yes, but it requires trade-offs. Most successful FIRE practitioners combine income growth (career advancement, side hustles) with intentional spending reduction. It's harder on a $50,000 salary than a $150,000 salary, but not impossible — especially with a partner following the same approach.