Compound Interest Calculator
Calculate compound interest with optional monthly contributions. See future value, total interest earned, and a year-by-year breakdown.
Results
0
Future Value
0
Total Interest Earned
0
Total Contributions
Year-by-Year Breakdown
| Year | Starting Balance | Contributions | Interest Earned | Ending Balance |
|---|
Frequently Asked Questions
How do I calculate compound interest online?▾
Enter your principal amount, annual interest rate, compounding frequency, and time period. Click Calculate to see your future value, total interest earned, and a year-by-year growth breakdown instantly.
What is the difference between monthly, quarterly, and annual compounding?▾
Compounding frequency determines how often interest is calculated and added to your balance. Monthly compounding (12x/year) yields slightly more than quarterly (4x/year) or annual (1x/year) because interest earns interest more frequently.
How do monthly contributions affect compound interest growth?▾
Regular monthly contributions significantly accelerate wealth growth because each deposit starts earning compound interest immediately. Even small consistent contributions can outpace a large initial investment over time.
Is my financial data safe with this compound interest calculator?▾
Yes. All calculations happen entirely in your browser. No data is ever sent to a server.