how long will my money last calculator

Plan your financial future by calculating the longevity of your savings and investments.

Yearly Breakdown

Year	Starting Balance	Annual Withdrawal	Interest Earned	Ending Balance

What is a How Long Will My Money Last Calculator?

A How Long Will My Money Last Calculator is an essential financial planning tool designed to help individuals determine the longevity of their retirement savings or investment portfolio. Whether you are planning for early retirement or managing a fixed nest egg, understanding the depletion rate of your assets is crucial for long-term financial security.

This tool is specifically built for retirees, financial planners, and anyone looking to understand how retirement savings interact with market returns and the eroding power of inflation. By inputting your current balance, planned spending, and expected growth, you can visualize the "runway" of your wealth.

Common misconceptions include ignoring the impact of inflation impact or assuming a static withdrawal amount. In reality, as prices rise, your purchasing power decreases, requiring higher withdrawals over time to maintain the same lifestyle. This calculator accounts for those variables to provide a realistic projection.

How Long Will My Money Last Calculator Formula

The calculation uses an iterative monthly compounding formula. Unlike a simple division of balance by spending, this formula accounts for monthly investment growth and monthly inflation adjustments to the withdrawal amount.

The core logic follows this sequence for each month (n):

1. Calculate monthly interest: Balance_n-1 × (Annual Return / 12)
2. Adjust withdrawal for inflation: Withdrawal_n = Withdrawal_initial × (1 + Monthly Inflation)ⁿ
3. Update balance: Balance_n = Balance_n-1 + Interest – Withdrawal_n

Variable	Meaning	Unit	Typical Range
Starting Balance	Total initial capital	Currency ($)	$10,000 – $10M+
Monthly Withdrawal	Amount taken for expenses	Currency ($)	$500 – $50,000
Annual Return	Expected portfolio growth	Percentage (%)	3% – 10%
Inflation Rate	Annual rise in costs	Percentage (%)	2% – 5%

Practical Examples (Real-World Use Cases)

Example 1: The Conservative Retiree

Imagine a retiree with a nest egg longevity goal of 30 years. They have $1,000,000 saved, plan to withdraw $4,000 monthly, expect a 4% annual return, and anticipate 3% inflation. Using the How Long Will My Money Last Calculator, they would find their money lasts approximately 28 years. This insight allows them to adjust their spending early to avoid running out of funds.

Example 2: The Aggressive Investor

A younger individual with $200,000 in a brokerage account wants to take a "sabbatical." They withdraw $3,000 a month but invest in high-growth assets returning 8% annually. With 2% inflation, the calculator shows the funds last about 6.5 years. This helps in planning the duration of their career break.

How to Use This How Long Will My Money Last Calculator

Follow these simple steps to get the most accurate results from the How Long Will My Money Last Calculator:

• Step 1: Enter your current total liquid savings in the "Starting Balance" field.
• Step 2: Input your desired monthly budget in the "Monthly Withdrawal" field.
• Step 3: Estimate your "Annual Return Rate." For a balanced portfolio, 5-7% is often used as a historical average.
• Step 4: Set the "Inflation Rate." The Federal Reserve typically targets 2%, but 3% is a safer conservative estimate.
• Step 5: Review the "Main Result" to see the total years and months your money will last.
• Step 6: Analyze the "Yearly Breakdown" table to see how your balance declines over time.

Key Factors That Affect How Long Your Money Lasts

1. Investment Returns: Higher returns extend the life of your money but often come with higher volatility.
2. Inflation Impact: Even low inflation significantly increases the amount you need to withdraw in later years.
3. Withdrawal Rate: The "4% rule" is a common benchmark, but your specific withdrawal rate should be tailored to your life expectancy.
4. Sequence of Returns Risk: Poor market performance in the early years of retirement can deplete a portfolio much faster than the same losses later on.
5. Tax Implications: Remember that withdrawals from traditional IRAs or 401ks are taxable, effectively reducing your usable balance.
6. Lifestyle Changes: Healthcare costs often increase with age, while travel expenses might decrease, affecting your monthly needs.

Frequently Asked Questions (FAQ)

1. Does this calculator account for taxes?

No, this How Long Will My Money Last Calculator uses gross figures. You should input your "after-tax" withdrawal needs for better accuracy.

2. What is a safe withdrawal rate?

Traditionally, 4% is considered safe for a 30-year retirement, but this varies based on investment returns and individual circumstances.

3. How does inflation affect my savings?

Inflation reduces the purchasing power of your money. If inflation is 3%, a $100 grocery bill today will cost $103 next year, requiring you to withdraw more from your retirement savings.

4. Can I use this for FIRE (Financial Independence, Retire Early)?

Absolutely. It is a perfect tool for the FIRE community to test different nest egg longevity scenarios.

5. What happens if my return rate is lower than inflation?

If your investment returns are lower than inflation, your "real" return is negative, and your money will deplete much faster than expected.

6. Should I include my home equity?

Generally, only include liquid assets you plan to spend. Home equity should only be included if you plan to downsize or use a reverse mortgage.

7. How often should I run this calculation?

It is wise to use the How Long Will My Money Last Calculator at least once a year or whenever there is a major market shift.

8. What if the calculator says my money lasts forever?

This happens when your investment returns exceed your withdrawals plus inflation. This is the goal of "perpetual wealth."