What is an investment calculator?
An investment calculator is an online tool that estimates how an investment may grow over time based on an initial investment, expected rate of return, investment period, and optional recurring contributions.
Investment Calculator
Model a long-term investment using your starting balance, monthly deposits, expected annual return, and timeline.
Enter your investment plan
Use a realistic return assumption and review a range of possible outcomes.
About this calculator
How to use Investment Calculator, plus the formulas and logic behind the results.
Tool description
The Investment Calculator projects future portfolio value from an initial investment, expected return, time horizon, and optional regular contributions.
How to use
- Enter your starting investment and expected annual return.
- Choose the investment period and any recurring contribution.
- Select Calculate to view projected future value and growth.
- Try more than one return rate to compare optimistic and conservative scenarios.
Formulas & reference
Future value of a lump sum with compound growthFuture value of recurring contributions added over the periodTotal growth = ending value − principal − contributions
Investment planning reminders
- Returns vary from year to year
- Fees reduce long-term growth
- Diversification can manage risk
- Past performance is not guaranteed
Calculation logic
Growth is modeled with a constant assumed return. Contributions are compounded for the remaining periods. Results are projections, not guarantees of market performance.
The projection assumes a constant monthly return and end-of-month contributions. It does not include taxes, inflation, or fees.
Investment Calculator FAQ
Common questions about the calculation and how to interpret the estimate.
How does an investment calculator work?
Enter the initial investment, expected annual return, investment period, and contribution amount if applicable. The calculator estimates the potential future value using compound growth.
How do you calculate investment growth?
Investment growth depends on the starting balance, rate of return, time, and additional contributions. Compound growth allows previous returns to remain invested and potentially generate additional returns.
What is compound growth in investing?
Compound growth occurs when investment returns are reinvested and then generate additional returns. Over long periods, this can significantly increase the value of an investment.
How does the rate of return affect investment growth?
A higher average rate of return can result in faster growth, especially over long periods. However, actual investment returns are uncertain and can vary from year to year.
How do regular contributions affect an investment?
Regular contributions can increase the final investment balance because additional money is continuously added to the account and has the opportunity to earn returns over time.
How long should I invest my money?
The appropriate investment period depends on your financial goals, risk tolerance, and when you need the money. Longer periods generally provide more time for compound growth but do not eliminate investment risk.
What is the difference between investment return and interest?
Interest is typically a predetermined payment earned on deposits or certain debt instruments, while investment return can come from interest, dividends, and changes in the value of investments.
Does an investment calculator account for inflation?
Some investment calculators include an inflation adjustment, while others show only the nominal future value. Adjusting for inflation can provide a better estimate of the future purchasing power of your money.
Can an investment calculator include monthly contributions?
Yes, many investment calculators allow you to enter recurring monthly or annual contributions. This helps estimate how regular investing may affect the future value of your portfolio.
Are investment calculator results guaranteed?
No. Investment calculator results are projections based on assumptions such as the expected rate of return and contribution schedule. Actual investment performance can be higher or lower.
What rate of return should I use in an investment calculator?
You should use a reasonable expected return based on the type of investment and your assumptions. It is often useful to compare multiple return scenarios rather than relying on a single rate.