Compound Investment Calculator

Estimate how a starting amount and regular monthly contributions could grow over time.

Estimated ending balance

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Enter your details and calculate the potential growth.

Your contribution and growth estimates will appear here.

Investment growth is the increase in the value of money you invest over time.

Your investment balance can come from:

Starting investment — The amount you begin with.
Contributions — Additional money you add over time.
Investment growth — The increase in value based on the return your investment earns.

Over a long period, investment growth can become a larger part of your ending balance because returns can build on earlier returns.

Compounding happens when your investment earns returns, and those returns can earn additional returns in the future.

The longer your money stays invested, the more time compounding has to work.

Regular contributions can also make a significant difference because each contribution has the opportunity to grow over time.

This calculator can help you estimate:

This calculator assumes:

The annual return you enter remains constant for the full investment period.
Contributions are made regularly each month.
Investment returns are compounded over time.
Contributions and investment growth remain invested.
Taxes, fees, inflation, and investment expenses are not included unless specifically accounted for.

Actual investment returns can vary from year to year, and investment values can rise or fall.

Starting investment — The amount of money invested at the beginning.
Monthly contribution — The amount added to the investment each month.
Annual return — The percentage your investment is assumed to gain or lose over one year.
Investment period — The amount of time the money remains invested.
Ending balance — The estimated value of the investment at the end of the selected period.
Estimated growth — The portion of the ending balance that comes from investment returns rather than contributions.