Compound Interest Calculator
See how your money grows over time with compound interest. Visualize the power of compounding with monthly contributions.
Inputs
$
Typical: $1K–$50K
$
Typical: $100–$2,000/mo
%
Typical: 5–10% for index funds
years
Typical: 10–30 years
Results
Future Value
$343,778.24
Total Contributions$130,000
Total Interest Earned$213,778.24
Effective Annual Rate8.3%
Future Value
$343,778.24
How to Use This Calculator
- Enter your Initial Investment (the lump sum you're starting with).
- Set a Monthly Contribution if you plan to add money regularly.
- Enter the expected annual Interest Rate (stock market averages ~8-10%).
- Choose the number of Years you plan to invest.
- Select the Compounding Frequency (monthly is most common for investments).
- Review the growth chart and final balance to see how compounding accelerates over time.
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