The FI Calculator

Plan your journey to Financial Independence and stress-test your portfolio against market volatility.

Financial Independence, Retire Early (FIRE) is a movement dedicated to achieving financial freedom long before traditional retirement age. This calculator helps you map out your journey.

1. Your Financial Snapshot & Goals

Start by entering your current financial details and your desired retirement lifestyle. This information is used to calculate your basic FIRE (Financial Independence, Retire Early) number and a baseline projection for when you might reach it.

FIRE Mode:

Major Life Events, Lump Sums & Recurring Incomes

Add one-time or recurring cash flows (e.g., college costs, inheritance, pension). Important: All amounts should be entered as the total value for the year (e.g., enter $12,000 for a $1,000/month expense). For events spanning multiple years, define a start and end age.

Type

Description

Amount (per year)

Start Age

End Age (optional)

Current Situation

Current Age

Current Savings Balance

Gross Annual Income

Expected Annual Salary Increase (%)

Net Yearly Savings Contribution

Retirement Goals

Desired Yearly Expenses in Retirement (in selected currency)

Monthly Income After FIRE (in selected currency)

Safe Withdrawal Rate (%)

Assumptions & Scenarios

Currency

Pre-FIRE Expected Annual Investment Return (%)

Post-FIRE Expected Annual Investment Return (%)

Expected Annual Inflation Rate (%)

Months to Detail in Pre-FIRE Table

2. Your FIRE Projection Summary

This is your baseline projection. It assumes your investment returns are the same every year. Use this as a starting point before stress-testing your plan in the Advanced Simulation section below.

Adjusted FIRE Number

Savings for expenses not covered by post-FIRE income.

Time to FIRE

Time to reach Adjusted FIRE Number.

Age at FIRE

Your age when Adjusted FIRE Number is met.

FI Date

Calendar date of reaching Adjusted FIRE Number.

Savings Rate

Percentage of gross income saved annually.

Years of Expenses Covered (Current)

Current savings cover this many years of retirement expenses.

Total Contributions to FIRE

Total amount contributed until FIRE.

Total Growth to FIRE

Total investment gains by FIRE.

Savings at FIRE

Projected savings when FIRE is reached.

The "Time-Cost" Translator New

See how "small" habits or "big" purchases delay your freedom.

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Annual Savings Growth (Pre-FIRE, Real Returns)

Year	Age	Starting Savings	Contributions	Investment Growth (Real)	Events	Ending Savings

Post-FIRE Annual Projection (Baseline Scenario - Real Values)

Based on Post-FIRE returns. Continues up to age 95 or until savings depleted.

Year (Post-FIRE)	Age	Starting Savings	Growth (Real)	Net Withdrawal from Savings	Total Income Rec'd	Ending Savings

What-If Levers: Instantly See the Impact

Yearly Savings Contribution

Current: 15,000

Yearly Retirement Expenses

Current: 40,000

Monthly Income After FIRE

Current: 0

Projected FIRE Age

5. Advanced Retirement Simulation

This is the most important step for stress-testing your plan. While the baseline projection assumes constant returns every year, this section simulates real-world uncertainty.

Historical Cycles (The "Reality Check"): This method tests your plan against the actual, recorded market history. It answers the question: "How would my plan have survived the best and worst periods of the last century?" Its strength is using real-world data, including every major crash and boom exactly as they happened.

Monte Carlo (The "What-If Engine"): This method is a powerful futuristic tool. Instead of replaying the past, it generates thousands of unique, random futures based on *your* assumptions for average returns and market volatility. It answers the question: "If the future is as good or bad as I expect, what are my chances of success?" Its strength is its flexibility to model scenarios that haven't occurred in the past. The results are a direct reflection of the parameters you set.

1. Select Simulation Type

Monte Carlo

Historical Cycles

2. Retirement Portfolio

3. Yearly Expenses in Retirement

4. Retirement Age

Historical Parameters

Stock / Bond Allocation (%)

Stocks Bonds

60% / 40%

Based on S&P 500 & 10-Yr Treasury data from 1928-2023.

5. Spending Flexibility (Optional)

Reduce spending if portfolio drops below initial value by:

Spending Reduction Amount (%):

This rule reduces your spending temporarily when your portfolio is down, helping it recover faster. Spending reverts to normal once the portfolio returns to its initial value.

The FI Calculator

1. Your Financial Snapshot & Goals

Major Life Events, Lump Sums & Recurring Incomes

Current Situation

Retirement Goals

Assumptions & Scenarios

2. Your FIRE Projection Summary

Adjusted FIRE Number

Time to FIRE

Age at FIRE

FI Date

Savings Rate

Years of Expenses Covered (Current)

Total Contributions to FIRE

Total Growth to FIRE

Savings at FIRE

Coast FIRE Number

The "Time-Cost" Translator New

Keep this tool free & fast

Annual Savings Growth (Pre-FIRE, Real Returns)

Detailed Monthly Growth (First Months Pre-FIRE)

Post-FIRE Annual Projection (Baseline Scenario - Real Values)

What-If Levers: Instantly See the Impact

3. "One More Year" Scenario Analysis

Impact of Working 1 Extra Year(s)

New Portfolio Value at Retirement

New Retirement Age

Increased Yearly Spending Possible

Or, Funds Last Until Age

4. Potential Early Retirement Income & Capital Growth

5. Advanced Retirement Simulation

Success Rate

Median Final Value

10th Percentile Value

90th Percentile Value

Years w/ Reduced Spending

1. Your Financial Snapshot & Goals

Major Life Events, Lump Sums & Recurring Incomes

Current Situation

Retirement Goals

Assumptions & Scenarios

2. Your FIRE Projection Summary

Adjusted FIRE Number

Time to FIRE

Age at FIRE

FI Date

Savings Rate

Years of Expenses Covered (Current)

Total Contributions to FIRE

Total Growth to FIRE

Savings at FIRE

Coast FIRE Number

The "Time-Cost" Translator New

Keep this tool free & fast

Annual Savings Growth (Pre-FIRE, Real Returns)

Detailed Monthly Growth (First Months Pre-FIRE)

Post-FIRE Annual Projection (Baseline Scenario - Real Values)

What-If Levers: Instantly See the Impact

3. "One More Year" Scenario Analysis

Impact of Working 1 Extra Year(s)

New Portfolio Value at Retirement

New Retirement Age

Increased Yearly Spending Possible

Or, Funds Last Until Age

4. Potential Early Retirement Income & Capital Growth

5. Advanced Retirement Simulation

Success Rate

Median Final Value

10th Percentile Value

90th Percentile Value

Years w/ Reduced Spending

FIRE Calculator Summary

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