What does the inheritance growth calculator estimate?

The calculator estimates how an inheritance could grow over time if it is invested at a constant annual return rate. It models year-by-year balances, optional withdrawals, and the ending value after the chosen number of years.

How are investment returns calculated?

Returns are modeled using a simple compound growth formula. Each year, the balance grows by the annual return rate, and then withdrawals are subtracted. This is a simplified model that assumes a steady rate and does not include market volatility.

Can I model withdrawals as a percentage instead of a fixed amount?

Yes. You can choose between a fixed annual withdrawal amount or a percentage of the starting balance each year. The calculator applies the selected withdrawal mode to the projected balance.

Is this tool suitable for retirement planning?

The inheritance growth calculator can be a helpful starting point for retirement planning, especially when an inheritance is part of your strategy. However, it does not model taxes, inflation, or detailed cash flows, so it should be used alongside more comprehensive planning tools and professional advice.

Does the calculator account for taxes or fees?

No. The current version focuses on pre-tax growth and withdrawals. You can approximate taxes or fees by using a lower effective return rate or manually adjusting the results in a spreadsheet after exporting the CSV.

Can I export the growth schedule?

Yes. Use the Export CSV button to download a year-by-year schedule of balances, returns, and withdrawals. You can import this file into a spreadsheet or share it with a financial planner.

Inheritance Growth Calculator

Project how an inheritance can grow over time. Model investment returns, annual withdrawals, and multi-decade growth to see how much wealth could be available for you, your heirs, or future generations.

Initial inheritance amount Expected annual return (%) Number of years

Withdrawal mode Annual withdrawal amount Annual withdrawal (%)

Inflation rate (optional, %) Rounding mode Scenario label (optional)

Tip: Try a conservative return rate and realistic withdrawals first, then explore more aggressive scenarios.

Important: This calculator uses simplified compound growth and withdrawal formulas. Actual investment returns vary, and taxes, fees, and inflation can significantly change outcomes. Use this tool for scenario planning and discussion, and confirm details with a qualified financial professional.

Inheritance growth formulas

The inheritance growth calculator uses a set of clear formulas to model how an inheritance might evolve over time. These formulas help you see the impact of investment returns, withdrawals, and inflation on the future value of the inheritance.

1. Annual growth without withdrawals

Annual return rate (decimal) = Annual return (%) ÷ 100

Balance at end of year n =
  Balance at start of year n × (1 + Annual return rate)

This is the classic compound growth formula. If you choose “No withdrawals,” the calculator applies this formula each year to project the balance.

2. Annual growth with fixed withdrawals

Balance after growth =
  Balance at start of year × (1 + Annual return rate)

Balance at end of year =
  Balance after growth − Fixed annual withdrawal

If Balance at end of year < 0, it is set to 0.

When you select a fixed annual withdrawal amount, the calculator grows the balance first and then subtracts the withdrawal. This models a scenario where you take a consistent amount out each year.

3. Annual growth with percentage withdrawals

Withdrawal amount for year n =
  Balance at start of year n × (Withdrawal % ÷ 100)

Balance after growth =
  Balance at start of year × (1 + Annual return rate)

Balance at end of year =
  Balance after growth − Withdrawal amount

In percentage mode, withdrawals scale with the starting balance each year. This can be useful for modeling sustainable withdrawal strategies, such as a 4% rule.

4. Inflation-adjusted value (optional)

Inflation rate (decimal) = Inflation (%) ÷ 100

Real (inflation-adjusted) balance in year n =
  Nominal balance in year n ÷ (1 + Inflation rate)ⁿ

If you enter an inflation rate, the calculator estimates the inflation-adjusted value of the inheritance each year. This helps you understand the purchasing power of the future balance, not just the nominal dollar amount.

These formulas are intentionally simple and deterministic. Real-world investing involves volatility, taxes, fees, and changing withdrawal needs. Use the inheritance growth calculator as a way to explore scenarios and build intuition before diving into more complex planning tools.

Using an inheritance to support long-term wealth

An inheritance can be a powerful tool for building long-term financial security, but it can also be overwhelming. The inheritance growth calculator helps you translate a lump sum into a multi-year story: how the money might grow, how much you could safely withdraw, and what might remain for future generations.

Clarifying your objectives

Before you start modeling numbers, it helps to clarify what you want the inheritance to do. Are you aiming to pay off debt, fund your own retirement, support children or grandchildren, or create a philanthropic legacy? Different goals call for different growth and withdrawal strategies. For example, a person who wants to preserve capital for heirs might choose modest withdrawals and a long time horizon, while someone focused on retirement income might prioritize a sustainable withdrawal rate.

Once you have a sense of your objectives, you can use the calculator to test scenarios. A conservative scenario might use a 4–5% annual return, a 3–4% withdrawal rate, and a 30-year horizon. A more aggressive scenario might assume higher returns and shorter time frames, but it also carries more risk if actual markets underperform.

Understanding growth and withdrawals

The core tension in inheritance planning is between growth and consumption. If you withdraw too much too quickly, the inheritance can shrink or disappear. If you withdraw too little, you might underspend and leave more than you intended. The calculator’s year-by-year schedule shows how the balance responds to different withdrawal modes.

In fixed withdrawal mode, you see how a constant annual amount interacts with compound growth. If the withdrawal is modest relative to returns, the balance may still grow over time. If the withdrawal is large, the balance may plateau or decline. In percentage mode, withdrawals scale with the starting balance each year, which can help keep the plan sustainable even if markets fluctuate around your assumed return.

Worked example

Imagine you receive an inheritance of $250,000. You expect a long-term annual return of 6% and want to model 30 years. You choose a 4% withdrawal rate and enter an inflation rate of 2.5% to see the real value of the money.

In the calculator, you set:

Initial inheritance: $250,000
Annual return: 6%
Years: 30
Withdrawal mode: Percentage
Withdrawal %: 4%
Inflation: 2.5%

The schedule will show each year’s starting balance, growth, withdrawal, and ending balance. Over time, you may see the nominal balance grow while the inflation-adjusted balance stays more stable. This can help you judge whether your withdrawal rate feels sustainable and whether the inheritance might still have meaningful value for heirs at the end of the period.

Practical tips

Start with conservative return assumptions; long-term market averages are not guarantees.
Use the inflation field to get a sense of real purchasing power, not just nominal dollars.
Experiment with different withdrawal rates to see how quickly the inheritance might be depleted.
Export the CSV and share it with a financial planner to refine your strategy.
Consider modeling separate scenarios for your own lifetime and for what you hope to leave to heirs.

An inheritance is more than a number—it is part of your story and your family’s story. By turning that number into a clear growth timeline, you can make more intentional decisions about how to use it, how much to preserve, and how to align your financial choices with the legacy you want to create.

Frequently Asked Questions

How many years can I model?

You can model up to 100 years. For most inheritance scenarios, 20–40 years is a practical range, but longer horizons can be useful when thinking about multi-generational wealth.

What happens if withdrawals exceed growth?

If withdrawals are large relative to returns, the balance may decline and eventually reach zero. The calculator caps the balance at zero and continues to show withdrawals as long as the plan specifies them, which can highlight unsustainable strategies.

Can I model taxes on investment returns?

The current version does not explicitly model taxes. You can approximate after-tax returns by using a lower effective return rate (for example, 4% instead of 6%) based on your expected tax situation.

How does inflation affect the results?

Inflation does not change the nominal balances; it is used to calculate an additional “real” value column in the schedule. This helps you understand how much purchasing power the inheritance might represent in future years.

Is this tool suitable for guaranteed products like annuities?

The calculator is designed for simple investment accounts, not for products with guarantees or complex payout rules. You can still use it for rough comparisons, but detailed modeling of annuities or insurance products should be done with specialized tools.

Does the calculator store my data?

The tool briefly stores your last inputs in localStorage to restore them after a refresh and auto-run the calculation. After the calculation is restored, the saved inputs are cleared. No data is sent to external services unless you enable analytics or ads via the cookie banner.