Monthly Investment Accumulation Calculator

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This calculator shows how much an investment will accumulate based on the current balance plus regular monthly investments, growing at an annual rate of return. It also shows the future value of the accumulated investment, adjusted for inflation.


An investor owns stocks valued at $10,000, and he plans to buy $500 worth of additional stock per month (with a 10% projected average rate of return). How much will he have in 20 years?

Field Input
Initial investment $10,000
Each monthly investment $500
Months of investment 240
Annual rate of return 10%
Compounded Monthly
Inflation rate 3%

In this example, the investor will have accumulated $452,965.17 of stock in 20 years. The accumulated value, adjusted for inflation, is $250,795.83.

Note: The compounded daily calculation uses 365 days. The difference between the interest rate and the effective interest rate is caused by the compounding of interest.

Copying and pasting investment schedules into Microsoft Excel or other applications

View this procedure to find out how to copy investment schedules from this calculator to the application clipboard, and then paste them into Microsoft Excel or other applications.

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