1. Enter your starting point
Type the initial deposit, monthly contribution, annual rate, and number of years.
Compound interest calculator
Compound Interest Calculator
See how your savings grow with compound interest over time.
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Year-by-year growth
| Year | Deposits | Interest earned | Balance |
|---|
What it does
A compound interest calculator projects how an initial deposit plus regular monthly contributions grow at a given annual rate. Interest compounds monthly, so each month’s gains start earning their own returns.
How to use
2. Calculate
See the projected final amount and how much of it is interest.
3. Compare scenarios
Change the monthly contribution or rate to see how small differences compound over years.
Limitations
Projections assume a fixed annual rate and ignore taxes, fees, and inflation. Actual investment returns vary. This is a calculation tool, not financial advice.
FAQ
How often does interest compound here?
Monthly. Each month’s interest is added to the balance, so the next month earns interest on a slightly larger amount.
Why does starting early matter so much?
Because compounding is exponential: money invested earlier gets more cycles of growth. The yearly table shows the curve steepening over time.
Are taxes included?
No. Real returns are reduced by taxes, fees, and inflation, which this calculator does not model.