Investment Growth Calculator
What is an Investment Growth Calculator?
An investment growth calculator projects how much an investment will be worth over time, combining the compounding of returns with your regular contributions. It helps you see the real power of consistent saving, even with modest monthly amounts.
Enter your initial investment, monthly contribution, expected annual return, and the growth period. The calculator shows the future value, how much you actually put in, the growth earned on that money, and the blended effective return. Understanding this compounding effect is the single most powerful motivation to invest early and consistently.
Frequently Asked Questions
How does compounding grow my investment?
Compounding means your returns earn their own returns. A $5,000 start with $300 monthly contributions at 8% over 20 years grows to roughly $201,000, even though you only invested about $77,000 - the other $124,000 is pure growth. The longer the timeframe, the more dramatic compounding becomes.
What is a reasonable expected return?
The long-run average for the U.S. stock market is about 7-10% per year, but that varies widely by year. Use a conservative 6-8% for planning, and remember past performance never guarantees future results.
Does the contribution timing matter?
Slightly. This calculator assumes contributions at the end of each month. Investing at the start of the month earns interest a bit earlier in return, adding a small amount over decades. Far more important than timing is simply contributing consistently every month.