Compound Interest Calculator
See how your money grows over time with compound interest and regular contributions.
Year-by-Year Growth
| Year | Year-End Balance | Interest This Year | Total Contributed |
|---|
For educational purposes only — not financial advice.
How to use
- Enter your starting principal — the initial amount you're investing.
- Set the annual interest rate (e.g., 7% for a stock market index fund average).
- Choose how often interest compounds — daily and monthly are most common.
- Set the number of years you plan to invest.
- Add a monthly contribution to see the power of regular investing.
- The Rule of 72 shows roughly how many years it takes to double your money.