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FIRE Calculator
Plan your path to Financial Independence and Early Retirement. Combine historical market data with your savings plan to model different scenarios and understand when you can achieve FIRE.
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What Is A FIRE Calculator? (& How Is Ours Different)
A FIRE Calculator helps you understand how long it will take to reach Financial Independence using inputs like your current portfolio, monthly contributions, expected returns, inflation, and your chosen Safe Withdrawal Rate (SWR).
This FIRE Calculator goes far beyond traditional tools.
It doesn’t just show a simple projection — it lets you:
- Compare forecast vs. real historical S&P 500 returns
- Test whether you’ll reach FIRE by a specific Target Year
- Check your Coast-FIRE status instantly
- Run goal-seek calculations to discover how much you must invest monthly
- View inflation-adjusted (real) results
- Zoom into charts and explore historical market events
- Analyse your portfolio with advanced metrics such as Savings Rate, Efficiency, Timeline Milestones, Best/Worst Years, Stability Index, and more
- Explore Monte-Carlo simulations to understand the probability of success under randomized return sequences
Note: This calculator is fully reusable — every scenario you create can be saved and returned to through a shareable URL. Simply adjust your numbers, copy the URL, and revisit it anytime (or share it with your partner or planner). Your exact inputs and settings will load instantly, making long-term FIRE tracking effortless.
Enter your numbers above to see exactly where you stand — and how close you actually are to early retirement.
If you want to read more about Financial Independence and Semi-Retirement, check out the following blog posts.
Quick Start Guide to the FIRE Calculator
Follow these simple steps to get instant results:
Choose Your Mode:
- Forecast Mode = smooth fixed return
- Historical Mode = real S&P 500 year-by-year data
- Monte-Carlo Mode = randomized return paths to test success probabilities
Enter Your Numbers:
Starting portfolio, monthly contributions, expected FIRE spending, and SWR.
Pick Your Target Year:
See whether you reach FIRE exactly by that year — or how far off you are.
Use the Toggles:
- Real (inflation-adjusted) values
- Compound-only growth
- Coast-FIRE status
- Historical events
- Heatmap / analytics overlays
- Timeline markers
Read Your Results:
You’ll get:
- FIRE reached / not reached
- Your FIRE number
- Your portfolio trajectory
- Required monthly contribution (goal-seek)
- Coast FIRE gap or confirmation
- KPI cards and advanced analytics
How to Use the FIRE Calculator (Step-by-Step)
For a detailed breakdown of every input and toggle, check out our step-by-step guide, where we walk you through each setting and show you exactly how to customize the calculator for your own FIRE plan.
Your FIRE Number (How It’s Calculated)
Your FIRE Number is the invested capital required so that a sustainable annual withdrawal funds your living expenses.
Formula:
Example:
If you plan 30.000 annual spending and choose an SWR of 4 %, then:
30.000 ÷ 0,04 = 750.000.
Crossing this line means your portfolio could, historically in many scenarios, sustain those withdrawals over long retirement horizons.
Tip: A lower SWR (e.g., 3,5 %) increases safety but raises the target. A higher SWR lowers the target but raises risk.
How Forecast vs. Historical Works
Forecast Mode
- Adds contributions annually
- Applies your chosen fixed return
- Optional: divides values by cumulative inflation
- Best for straightforward projections
Historical Mode
- Uses real annual returns + inflation
- Shows volatility, crashes, recoveries
- Excellent for stress-testing your plan
- Goal-seek finds the exact contribution needed to hit FIRE in your Target Year under that historical sequence
Monte-Carlo Mode (NEW)
- Creates randomized sequences of returns based on historical return distributions
- Runs hundreds or thousands of scenarios
- Shows your probability of reaching FIRE
- Helps you evaluate risk instead of relying on a single timeline
How Taxes & Fees Affect Your FIRE Journey
The FIRE Calculator also accounts for taxes and fees, offering a realistic view of your compounding rate after drag — typically 0.5–1.5% for low-cost portfolios.
This slider in the assumptions tab reduces your gross return by an annual “drag” to reflect real-world frictions like fund TER/expense ratio, brokerage/platform fees, dividend withholding taxes, and tracking differences. The drag applies across accumulation and the FIRE phase so projections stay realistic.
Example:
If your gross return is 7% and your tax/fee drag is 1.0%, your net return becomes 6.0%.
On 100,000 over 10 years, that’s 196,715 vs. 179,085 — a gap of 17,630 due to fees and taxes.
Even small changes in fees can significantly impact how soon you reach Coast FI or Full FIRE.
Tip: Low-cost index portfolios often land around 0.5–1.5% as mentioned above. You can use the higher end if your dividends are taxed heavily or you hold costlier/active funds.
Tips to Get the Most Out of the FIRE Calculator
Stress-Test Your Plan
Compare:
- Forecast
- Historical
- Monte-Carlo
Use Goal-Seek: Find your ideal monthly contribution in seconds.
Use Real Values: Inflation is one of the biggest long-term risks in FIRE planning.
Check Coast-FIRE Often: You might be closer than you think — or missing only a small gap.
Explore the Heatmap and Analytics: They highlight where your plan is strongest or most vulnerable.
FIRE Calculator FAQs
Here are the most common questions and simple answers to help you use the calculator effectively.
What SWR Should I Use?
Commonly cited values range from 3–4 % for long retirements. Lowering SWR (e.g., 3,5 %) increases robustness but raises your target. Pick a rate aligned with your risk tolerance, horizon, asset mix, and flexibility.
What’s The Difference Between Nominal And Real Values?
Nominal values ignore inflation. Real values adjust for inflation so you see results in today’s purchasing power. Toggle “Show real values” to compare.
Why Does The Historical Mode Feel So Different From Forecast?
Because it uses the actual sequence of ups and downs year by year. The order of returns matters—bad early years can delay FI even if the long-term average is similar.
How Does Goal-Seek Work Here?
The calculator searches for the exact constant monthly contribution that would make your portfolio equal your FIRE Number in the Target Year.
What Is Coast-FIRE And How Do I Read That Box?
Coast-FIRE asks: If I stop contributing now, will compounding alone carry me to my FIRE Number by my Target Year?
If yes, you’re free to reduce or stop contributions.
If no, the calculator shows how far you are and (when possible) what lump sum you would have needed today to coast.
My Target Year Shows “Outside Range.” What Does That Mean?
Your Target Year must lie inside the simulation window (from the first to the last chart year). Either reduce Simulation Years, change Start Year (Historical), or pick a different Target Year.
Can I Rely On This For Retirement Decisions?
This is an educational tool — speak with a professional before making major decisions.
Do Higher Contributions Always Beat Higher Returns?
You can’t control markets, but you can control savings. Increasing Contribution/Month is the most reliable lever to reach FI faster—use goal-seek to quantify how much is needed.
More Freebies For Your Financial Independence Journey
Coast FIRE Calculator
Discover your path to Coast FIRE with our free interactive Coast FIRE Calculator! Easily project your financial journey, calculate your FIRE Number, and see how close you are to financial independence. Start optimizing your investments today!
Retirement Withdrawal Strategy Calculator
Not sure how to make your savings last through retirement? Our Retirement Withdrawal Strategy Calculator lets you test proven withdrawal methods, see how they would have performed in real markets, and find the strategy that keeps your income steady for life.
Barista FIRE Calculator
Discover your path to Barista FIRE with our free interactive calculator. Plan your transition from full-time work to part-time freedom, visualize portfolio growth, and ensure financial independence with tailored projections based on your financial situation. Start crafting your dream lifestyle today!
Flamingo FIRE Calculator
Wondering if you really need to save the full FIRE number? Our Flamingo FIRE Calculator shows you how to stop at 50% of your goal, let compounding do the rest, and still reach full financial independence. Run your own numbers and see how Flamingo FIRE could let you shift to part-time work or semi-retirement years earlier.
Simple Budget Calculator
Take control of your finances with our free Simple Budget Calculator! Track income and expenses, visualize spending with interactive charts, and master the 50/30/20 rule. Start building better money habits today!
Simple Bare Bones Budget Calculator
Wondering how to survive a period of lower income or high expenses? This free calculator helps you plan a budget you can actually live on — even with debt or big savings goals.
Compound Interest Calculator
What’s possible for my money if I invest a large amount on the stock market? Watch your portfolio grow and compound over time until part of your retirement is funded. You can use it as a Coast FIRE Calculator.
Investment Growth Calculator
See what’s possible for your money when you start investing at least a portion of your money in the stock market every month. How could this increase your retirement income?
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Your FIRE Plan Just Got Smarter 🔥
⭐Our newly released FIRE Calculator
- Reusable: Save for reuse or share your scenario anytime
- Forecast, historical & Monte-Carlo projections
- FI date + Coast-FIRE at a glance
- Goal-seek for your required monthly contribution
- Interactive charts & timeline insights
- Real (inflation-adjusted) results
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What you get
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- The current value and monthly investments you consider
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What you get
- 1 Sheet to model your portfolio’s growth after entering:
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- … maybe (a part of) your retirement would be funded.
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- … generates per year & in total for each new investing year.
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