Free Tool
Investment Growth Calculator
Enter a starting balance, a monthly contribution and an expected return, and see how compound growth builds your balance over time. This is a real, working calculator, free and with no sign-up required.
Total contributed
$49,000
Growth earned
$59,224.07
Final balance
$108,224.07
How much will my investments grow?
Growth depends on how much you start with, how much you add regularly, your average annual return and how long the money stays invested. Small, consistent contributions started early often outperform larger contributions started late, because compounding needs time more than it needs size.
What is a worked example?
Starting with $1,000 and investing $200 per month at a 7 percent average annual return for 20 years grows to roughly $107,000, of which about $49,000 came from your own contributions and about $58,000 came purely from growth compounding on itself.
Why does time matter more than timing?
Compound growth is multiplicative, not additive. Each additional year lets prior growth also grow, so the last years of a long investing window typically add more value than all the early years combined. Consistency beats trying to time markets.
FAQs
How does compound growth work?
Compound growth means your returns earn their own returns. Each year, growth is calculated not only on your original contributions but also on all the growth already earned, which is why balances accelerate the longer money stays invested.
What annual return should I assume?
Many long-term investors use a conservative 6 to 8 percent average annual return for diversified stock investments, understanding real returns vary year to year and are never guaranteed.
Does starting early really matter that much?
Yes. Because growth compounds on itself, an investor who starts ten years earlier with smaller contributions often ends up with more than someone who starts later with larger contributions, simply because time did more of the work.
Should I invest a lump sum or monthly?
Both work. Monthly contributions build the habit and smooth out market timing risk, while any lump sum you have available can be invested immediately to start compounding sooner rather than sitting in cash.
Keep learning
Go deeper with our free training, or read How to Build Wealth From Zero and Money Management for Beginners.
PleniSeed provides educational information and does not provide individualized financial, investment, tax or legal advice.