FIRE Number Calculator
Calculate your FIRE number — the total portfolio value needed for financial independence — instantly. Enter your annual expenses, safe withdrawal rate, current savings, and investment details to see your FIRE target, years to financial independence, Lean/Regular/Fat FIRE variants, and a complete year-by-year portfolio projection. Free, private, and no signup required.
Enter your annual expenses, safe withdrawal rate, current savings, and investment details to instantly calculate your FIRE number and how many years until financial independence. All calculations run locally in your browser — your data never leaves your device.
Your total yearly spending in retirement
Rate at which you withdraw from portfolio annually
Total investable assets today
Amount you invest per year
Used to calculate savings rate
Nominal portfolio return (e.g. 7% for index funds)
Used to compute real (inflation-adjusted) return
FIRE Number = Annual Expenses ÷ Safe Withdrawal Rate
- At 4% SWR: FIRE Number = Annual Expenses × 25
- At 3.5% SWR: FIRE Number = Annual Expenses × 28.6
- At 3% SWR: FIRE Number = Annual Expenses × 33.3
- Real Return = (1 + Nominal Return) ÷ (1 + Inflation) − 1
Why Use Our FIRE Number Calculator?
Accurate FIRE Number Calculations
Our FIRE number calculator uses the standard safe withdrawal rate formula (FIRE Number = Annual Expenses ÷ SWR) and projects your years to financial independence using real (inflation-adjusted) portfolio returns — the same methodology used by the FIRE community worldwide.
Lean, Regular & Fat FIRE Variants
See your FIRE number for three lifestyle scenarios simultaneously — Lean FIRE (75% of expenses), Regular FIRE (current expenses), and Fat FIRE (150% of expenses). Compare all three at your chosen safe withdrawal rate to understand your full range of options.
Completely Private & Secure
All FIRE calculations happen locally in your browser. Your income, savings, expenses, and financial goals are never sent to any server, ensuring 100% privacy when you use our FIRE number calculator online.
Year-by-Year Projection — 100% Free
Get a complete year-by-year portfolio projection showing portfolio value, total contributions, investment growth, and FIRE progress percentage for every year until you reach financial independence. Free, no ads, no signup.
Common Use Cases for FIRE Number Calculator
Setting Your Financial Independence Goal
Use the FIRE number calculator to establish a concrete savings target for financial independence. Knowing your exact FIRE number transforms an abstract goal into a specific, measurable milestone you can track and work toward.
Comparing Lifestyle Scenarios
Use the Lean, Regular, and Fat FIRE variants to understand how your lifestyle choices affect your savings target. Reducing annual expenses by $10,000 can cut years off your FIRE timeline — the calculator shows the exact impact instantly.
Evaluating the Impact of Savings Rate
Your savings rate is the single most powerful lever in your FIRE journey. Use the FIRE number calculator to see how increasing your annual savings by $5,000 or $10,000 changes your years to financial independence.
Choosing the Right Safe Withdrawal Rate
The 4% rule is the classic standard, but longer retirement horizons may require 3% or 3.5%. Use the FIRE calculator to compare your FIRE number and timeline across different withdrawal rates to find the right balance for your situation.
Early Retirement Planning
Traditional retirement calculators assume a 30-year horizon. FIRE planners often target 40–60 year retirements. Use the FIRE number calculator with a conservative 3–3.5% SWR to ensure your portfolio lasts through an extended retirement.
Tracking Progress Toward FIRE
Use the FIRE progress bar and year-by-year projection to track how close you are to financial independence. Recalculate annually as your savings grow to see your FIRE date moving closer and stay motivated.
Understanding the FIRE Number
What is the FIRE Number?
The FIRE number (Financial Independence, Retire Early) is the total portfolio value you need to sustain your lifestyle indefinitely without working. It is calculated by dividing your annual expenses by your safe withdrawal rate (SWR) — the percentage of your portfolio you can withdraw each year without running out of money. At the classic 4% SWR (from the Trinity Study), your FIRE number is simply your annual expenses multiplied by 25. Our FIRE number calculator computes this instantly and projects how many years it will take to reach your goal.
How Our FIRE Number Calculator Works
- 1. Enter Your Expenses & SWR: Input your expected annual expenses in retirement and choose a safe withdrawal rate. The FIRE number is calculated instantly as Annual Expenses ÷ SWR.
- 2. Enter Your Financial Details: Input your current savings, annual savings rate, expected portfolio return, and inflation rate. The calculator uses your real (inflation-adjusted) return for projections.
- 3. Review Your FIRE Timeline: See your FIRE number, years to financial independence, savings gap, FIRE variants, and a year-by-year portfolio projection — all calculated locally in your browser.
FIRE Variants Explained
- Lean FIRE: Retire on a frugal budget — typically 75% of your current expenses. Requires a smaller FIRE number but demands strict spending discipline in retirement.
- Regular FIRE: Retire maintaining your current lifestyle. The standard FIRE target for most people in the community.
- Fat FIRE: Retire with a comfortable, generous lifestyle — typically 150% of current expenses. Requires a larger portfolio but provides more financial security and flexibility.
- Coast FIRE: Reach a portfolio size where, if left to grow without additional contributions, it will reach your FIRE number by traditional retirement age. Allows you to stop saving aggressively and work less.
The 4% Rule and Safe Withdrawal Rates
- 4% SWR (25× rule): Based on the Trinity Study — historically sustainable for 30-year retirements with a diversified stock/bond portfolio.
- 3.5% SWR (28.6× rule): More conservative — recommended for 35–40 year retirements or those retiring in their 40s.
- 3% SWR (33.3× rule): Very conservative — appropriate for 40–60 year retirements or those retiring in their 30s.
- Savings Rate Impact: A 50% savings rate typically leads to FIRE in ~17 years; a 75% savings rate can achieve FIRE in ~7 years. Use the FIRE number calculator to see the exact impact of your savings rate.
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Frequently Asked Questions About FIRE Number Calculator
A FIRE number calculator is a tool that computes the total portfolio value you need to achieve financial independence and retire early. It uses the formula FIRE Number = Annual Expenses ÷ Safe Withdrawal Rate and projects how many years it will take to reach that goal based on your current savings, annual contributions, and expected investment returns. Our free online FIRE number calculator runs entirely in your browser — no signup required.
The 4% rule comes from the Trinity Study (1998), which found that a portfolio of 50–75% stocks and 25–50% bonds could sustain a 4% annual withdrawal for 30 years in 95%+ of historical scenarios. For early retirees with 40–60 year horizons, many FIRE practitioners use 3–3.5% to be more conservative. The rule remains a useful starting point, but your actual SWR should account for your specific timeline, asset allocation, and flexibility.
Absolutely. All FIRE calculations happen entirely in your browser using JavaScript. Your income, savings, expenses, and financial goals are never transmitted to any server. No data is stored, logged, or shared — your information stays completely private on your device.
Yes — our FIRE number calculator is 100% free with no signup, no account, and no usage limits. Calculate your FIRE number and timeline as many times as you need, completely free forever.
Lean FIRE means retiring on a frugal budget (typically 75% of current expenses), requiring a smaller portfolio but strict spending discipline. Regular FIRE means maintaining your current lifestyle. Fat FIRE means retiring with a generous, comfortable lifestyle (150%+ of current expenses), requiring a larger portfolio but providing more financial security and flexibility.
Inflation reduces the purchasing power of your portfolio over time. Our FIRE number calculator uses the real (inflation-adjusted) return — calculated as (1 + nominal return) ÷ (1 + inflation) − 1 — for the years-to-FIRE projection. This ensures the projection accounts for the erosion of purchasing power and gives you a more accurate timeline.
Your savings rate is the most powerful variable in your FIRE journey. A 10% savings rate typically takes 40+ years; 25% takes about 32 years; 50% takes about 17 years; 75% takes about 7 years. Use the FIRE number calculator to see exactly how changing your annual savings affects your timeline.
Most FIRE practitioners exclude primary residence equity from their FIRE number because it is not a liquid, income-generating asset. Include only investable assets — index funds, ETFs, bonds, REITs, and other liquid investments — in your current savings figure. If you plan to downsize or rent in retirement, you can factor in the expected proceeds separately.
Coast FIRE is the point at which your existing portfolio, if left to grow without additional contributions, will reach your full FIRE number by traditional retirement age (65). Once you reach Coast FIRE, you only need to earn enough to cover current expenses — you can stop saving aggressively and work less stressful, lower-paying jobs.