Financial Independence Calculator

How to use this calculator

Enter the amount you expect to spend each year once independent, the withdrawal rate you plan to use, what you have invested today, how much you add each month, and an assumed annual return. The calculator works out your FI number and estimates how long it takes for your portfolio to reach it.

Try a few scenarios. Spending less, saving more each month, or accepting a more conservative withdrawal rate all change the timeline, and comparing them is more useful than trusting a single projection.

What financial independence means

Financial independence is the point where the income from your investments can cover your living expenses, so paid work becomes a choice rather than a necessity. It does not require you to stop working, and many people who reach it keep working on their own terms. We explore the idea in more depth in What Does Financial Independence Really Mean?

The central figure is your FI number: the portfolio large enough that a modest, sustainable withdrawal from it matches your spending. It is defined as your annual spending divided by your withdrawal rate. At a 4 percent rate, that works out to 25 times your annual spending.

How the numbers are calculated

Your FI number is your annual spending divided by your withdrawal rate. To estimate the timeline, your current portfolio grows at the assumed return, compounded monthly, while your monthly contributions are added at the end of each month and compound for the remaining time. The calculator counts the months until the projected balance first reaches your FI number, then splits that balance into your starting savings, your total contributions, and the investment growth on top.

Distinguish this from trading. Reaching financial independence this way relies on long-term, diversified investing and consistent saving, not on short-term speculation. If your current portfolio already exceeds your FI number, the timeline shows that you are already there.

Assumptions

• The return rate is the same every year. Real returns do not behave this way.
• Contributions are made at the end of every month, without interruption.
• Your annual spending and withdrawal rate stay constant.
• No taxes or investment fees are deducted.
• Results are shown in nominal dollars and are not adjusted for inflation.
• Figures are rounded to whole dollars.

Limitations

• This is an educational estimate, not a prediction, guarantee, or individualized advice. All investing involves risk, including the possible loss of principal.
• Actual investment returns rise and fall from year to year, so a real timeline can differ substantially from a constant-rate estimate.
• Withdrawal-rate guidelines such as the 4 percent rule come from historical market studies and are not guaranteed; the order of returns early in retirement matters a great deal.
• It does not model taxes, investment fees, inflation, healthcare costs, Social Security, or pensions.
• It assumes steady saving and steady spending, which rarely hold across an entire life.

Frequently asked questions

What is a FI number?

It is the size of portfolio at which a sustainable withdrawal covers your spending. It equals your annual spending divided by your withdrawal rate, which is 25 times your annual spending at a 4 percent rate. It is a target, not a guarantee that the money will last.

What is the 4 percent rule?

It is a commonly cited guideline suggesting that withdrawing about 4 percent of a diversified portfolio in the first year, then adjusting for inflation, has historically had a reasonable chance of lasting around 30 years. It is based on past US market data, is not guaranteed, and some people choose a more conservative rate.

Does financial independence mean I have to stop working?

No. It means work becomes optional. Many people who reach financial independence continue to work, change to lower-paid work they enjoy, or step back gradually.

Does it account for taxes and inflation?

No. Results are in today’s nominal dollars and before taxes. A real plan also has to consider inflation, taxes on withdrawals, healthcare, and the risk of poor returns early on.

How is this different from the retirement calculator?

The Retirement Calculator projects a balance and income by a chosen retirement age. This tool works the other way: it starts from the spending you want to cover and estimates how long it takes to build a portfolio that supports it.