FIRE calculator
Estimate your financial independence target and timeline from income, expenses, assets, returns, inflation and withdrawal assumptions. Compare scenarios in the annual growth chart and detailed table.
income · saving · target
FIRE target simulation
Change the assumptions for income and expenses, current assets, and the return rate, and compare in a graph and a table how long it takes to reach the financial independence target.
Enter US dollars directly, including cents. Use a decimal point for cents and commas for thousands. No currency conversion. The FIRE target is rounded to the nearest dollar.
Enter monthly income, monthly expenses and current invested assets in US dollars. Then adjust the expected return, inflation, safe withdrawal rate (SWR) and simulation period.
Enter a value.FIRE calculator user guide
The FIRE calculator is a web tool that quickly calculates how much in invested assets you need for financial independence (Financial Independence, Retire Early) and how many years from now you can reach the goal with your current savings pace and return assumptions. If you enter monthly income and monthly expenses, it calculates the monthly savings amount and the savings rate, converts monthly expenses into annual living expenses, divides that by the safe withdrawal rate (SWR), and estimates the target assets. You can check the results on one screen: the years to achievement shown as large numbers, a progress bar, a savings rate gauge, a year-by-year asset growth bar chart, and a detailed table by year.
This calculator is not investment advice or a judgment that retirement is possible. Actual results can differ greatly depending on the expected return, the inflation rate, the safe withdrawal rate, taxes, fees, the timing of market declines, changes in spending, housing costs, health insurance, and family planning. In particular, the 4% rule is only a widely known rule of thumb from research based on past data, and it is not a guaranteed formula that applies unchanged to every country, asset allocation, and retirement period.
When you need this tool
- When you want a quick figure for the financial independence target amount based on your current living expenses
- When you want to compare on a chart how much the estimated FIRE timing changes if you reduce monthly expenses or increase monthly savings
- When you want to see several scenarios by changing the expected return, the inflation rate, and the safe withdrawal rate more conservatively
Check before calculating
- Enter monthly income and monthly expenses on the same basis as each other, such as an after-tax cash flow basis.
- Enter the expected return as a nominal return, and enter the inflation rate separately so that the real return is calculated.
- Remember that the safe withdrawal rate is an assumed value that differs according to each person's asset allocation, retirement period, taxes, and market risk.
How to use
- Enter your current age, monthly income, and monthly expenses to check the monthly savings amount and the savings rate.
- Enter your current invested assets to reflect whether you are already close to the goal.
- Enter the annual expected return and the inflation rate to set the simple real return.
- Enter the safe withdrawal rate to calculate the target assets required relative to annual spending.
- Set the maximum simulation period and compare the years to achievement, the asset growth chart, and the year-by-year table.
How to read the asset growth chart and the year-by-year table
The asset growth bar chart shows each year's cumulative assets as a bar, and from the point it crosses the target line (red dotted line) the bar color changes to green (after FIRE). The year-by-year detail table sets out each year's age, annual savings, investment return, cumulative assets, and achievement rate, and the year FIRE is reached is highlighted with 🔥. With the copy table contents button, you can paste it as-is into a spreadsheet and analyze it in more detail.
When interpreting the safe withdrawal rate
The safe withdrawal rate is a simplified assumption of how much you can withdraw and spend each year after retirement. Bengen's 1994 study and the 1998 study known as the Trinity Study analyzed withdrawal rates based on historical U.S. market data and a specific portfolio and period. Therefore, the SWR value entered on this page should be seen as an assumption for comparing scenarios, not as a guaranteed return. If you want a more conservative view, lower it to 3~3.5% and check how the target amount grows.
Turning the results into a real-life plan
Even if the estimated number of years to reach the goal comes out short, that does not mean you can retire right away. You need to check taxes, health insurance, housing stability, an emergency fund, family support, the possibility of returning to work, and withdrawal limits on investment accounts together. If, on the other hand, the goal comes out far away, it is useful for reviewing one by one the inputs you can change, such as cutting expenses, increasing income, improving the savings rate, and adjusting the target living expenses.
Sources and review criteria
The calculation logic uses only the assumptions entered by the user. The explanation of the safe withdrawal rate and the 4% rule was reviewed on 2026-06-15 based on Bengen 1994, Cooley·Hubbard·Walz 1998 (Trinity Study), and the Investor.gov compound-interest materials, and the next re-review date is 2026-12-14.
The calculation result is a simple simulation based on the assumptions entered by the user. Investment performance, inflation, taxes, fees, and withdrawal sequence risk can greatly change the actual outcome, so a separate review is needed before a financial decision.
Calculation basis and sources
- Calculation scope
- Simulates a FIRE target and timeline using current age, income, expenses, invested assets, expected returns, inflation, safe withdrawal rate (SWR) and the time horizon. Taxes, sequence risk and actual market returns are not included.
- Calculation method
- Target amount = annual retirement spending ÷ safe withdrawal rate. Assets grow at the assumed real annual return, and the full year of monthly savings is added at each year end. The first year at the target determines the estimated FIRE age.
- Limitations and disclaimer
- This is not investment advice and does not guarantee future returns. Actual results can vary greatly depending on market returns, inflation, taxes, fees, withdrawal sequence risk, and changes in spending.
- Processing of personal information
- Input values are calculated only in the current browser and are not sent to a server or stored.
🗓️ Source and wording review date 2026-06-15 · 🔁 Next review scheduled 2026-12-14
Reference sources
- William P. Bengen, Determining Withdrawal Rates Using Historical Data, Journal of Financial Planning, 1994; FPA reprint
- Philip L. Cooley, Carl M. Hubbard, Daniel T. Walz, Retirement Savings: Choosing a Withdrawal Rate That Is Sustainable, AAII Journal, 1998
- Investor.gov compound interest calculator reference
FAQ
How is the FIRE target amount calculated?
Divide annual expenses by your safe withdrawal rate (SWR). Monthly expenses of $2,500 become $30,000 a year. Dividing $30,000 by 4% gives a $750,000 target. The 4% rule (Rule of 25) means saving about 25 times your annual living expenses.
Can I use the 4% rule (safe withdrawal rate) as-is?
Do not use it as-is. 4% is only a widely known rule of thumb from the Bengen (1994) and Trinity Study (1998) research that analyzed historical U.S. market data, and it may not fit depending on the country, taxes, length of retirement, asset allocation, and the current market environment. If you want a more conservative view, lower the SWR to 3~3.5% and compare.
Why is the savings rate so important for reaching FIRE?
A higher savings rate means more money invested each year and lower living expenses, which can greatly shorten the time to your target. Try adjusting income or expenses to change the savings rate in increments of 5 percentage points, then compare the asset growth chart and yearly table.
How are the return and inflation reflected?
This calculator simulates assets with a simple real return equal to the annual expected return minus the inflation rate. If the nominal return is 5% and inflation is 2%, it assumes that assets grow each year at a real 3%. In reality, the return is not constant every year, and the result can change greatly depending on an early decline (sequence risk).
Are the income and asset information I enter stored?
No. The Toolvil calculator calculates only in the current browser and does not send input values to a server or store them. The result is a one-time simulation that disappears when you refresh.